PainScience.com • Good advice for aches, pains & injuries

Complete Guide to Headaches

Detailed, readable, science-based self-help for tension headaches and other common musculoskeletal headaches

Paul Ingraham, updated

Close-up photograph of a face squinting in pain from a headache, cropped to show just some forehead, an eye, and bridge of the nose.

Almost every second human being has had a tension headache & one in ten have had a migraine, putting headaches in the top 10 most disabling conditions (top 5 for women).

The two main kinds of common headaches are tension-type headaches and migraines. Almost half of the population knows the pain of tension headaches, and one in ten get migraines, and more women — making headaches one of the top 10 most disabling conditions, and the top 5 for women.1 That’s a lot of aching heads.

Migraines are usually worse than tension headaches, but not necessarily: some migraines are quite tame, while “just” a tension headache can be shockingly fierce. Some migraines turn out to be monstrous tension headaches.2

This tutorial is mostly about tension headaches, but with plenty of comparing and contrasting with migraine (and many other kinds of headaches). It’s about troubleshooting unexplained headaches that may or may not have anything to with “tension.” There’s lots about diagnosis and when to worry about headaches, the multitudinous causes of headaches,3 reviews of all the best and most popular treatment options (rarely the same thing). There are some cases studies, some dad jokes, and plenty of “fun facts” and mythbusting along the way.4 Headaches are awful, but they are also interesting!

Tension Headache vs Migraine: What’s the Difference?
Tension Headache Migraine
musculoskeletal pain neurological “brain ache”
mostly less awful often worse … but not always!
usually both sides usually one side
pressure, tightness throbs with pulse
noise sensitivity light sensitivity
few weird symptoms weirdness standard

The nature of the beast: what is a “tension” headache?

Kids like to ask “why?” When you answer, they like to ask it again. And again. And again. If you’re ever trying to explain what a tension headache is to a kid, you’re going to hit a brick wall quickly, because “tension headache” is not a clear concept. Why do people get tension headaches? Because of stress and, er, tension. But why? Um… I guess, well, tension is painful…

And why is that?

Experts are stumped by this too, because “tension headache” is just a catch-all term for any unexplained headache that isn’t a migraine and doesn’t seem to be scary in other way. A better name might be musculoskeletal headache, or perhaps just undiagnosed headache, rather than blaming “tension,” which is extremely vague. The moment there’s a better and more specific explanation for a headache than “tension,” it ceases to be a tension headache. But until then…

Most of us know all too well that headaches are strongly linked to stress.5 Stress either causes pain directly and/or it causes other things to go wrong that hurt, usually assumed to be musculoskeletal problems — trouble with bones, joints, and meat.6 But exactly how we get from stress to headache is quite uncertain.

How stress makes heads ache (maybe)

Is there such a thing as a pure stress headache, where the only problem is with your feelings? A completely sensory phenomenon, involving no physical stress of any kind? Probably, yes: as if life wasn’t hard enough, we humans have the power to transmogrify emotional distress into discomfort (somatization). If it’s possible for us to feel terrible pain when there’s absolutely nothing actually wrong with us — which it is, unfortunately78 — then a headache might be the most routine example of it, probably the most common form of psychosomatic pain, where “headache” almost literally means “painful thinking.”

But it’s more likely there’s usually some kind of intermediate physical step. That is, feelings cause something to happen in the flesh which, in turn, is the actual cause of aching in the head. But what would that be, exactly?

“Muscle tension” is the main suspect — not a well-established fact scientifically, but seemingly obvious to everyone.9 Most of the time, for most people, a “tension headache” feels like muscular tightness around the head, neck, and face, and shoulders, especially sore, stiff suboccipital muscles under the back of the skull, and the jaw muscles, especially in the temple.

Funny animated gif of two strange animated characters rapidly opening and close their jaws.

Jaw muscles get used heavily. That may lead to some headaches.

Muscle tension is probably inherently uncomfortable and the main mechanism by which stress causes headache, but muscles can also probably get into worse trouble than mere tension. The neck, jaw, and shoulder muscles are routinely sore, full of (hypothetical) trigger points (“muscle knots,” actual knots not included)10 that radiate pain all over your head, and sometimes down into your neck, shoulders and even arms as well.11 These tender spots in muscle are either literally tense (contracted), or they just feel like it,12 which is one of the reasons we call it a “tension” headache. The problem is that these sensitive spots are barely understood, and their role in headache is unconfirmed.

Despite all the scientific uncertainty, treating many unexplained headaches can be as simple as just learning about these “perfect spots” for massage. I will discuss muscle pain much more later on in the tutorial.

But it’s not all about tension

Feelings of “tightness” could just be a symptom of other kinds of headaches. A lot of unexplained headaches are probably caused not by stress, directly or indirectly, but by other musculoskeletal problems, simpler than the exotic physiology of migraine, but you would be surprised how zany musculoskeletal pain can get. Many headaches are probably cervicogenic headaches (“from the neck”), but even that simple idea has been amazingly controversial.13

GO TO TOPCONTENTSNOTES

Part 2

Diagnosis of Headache

When to worry about a headache (and when not to)

Safety first, please: severe and strange headaches need medical investigation. There are many types of headaches — literally hundreds of them — and some have serious medical causes. Headaches can be their own problem (primary), or they can be a symptom of something else (secondary). You need to see a doctor, stat, if your headaches are:

The worst sneaky common cause of headaches is probably torn vertebral arteries. Headache is the only symptom of up to half of these cases in the first few days, but it is usually a really weird headache. More on this later.

And a headache can be all that and still turn out to be a tension or musculoskeletal headache. So please, don’t panic.

Image of blue text on a black background, under a thumb’s out hitchhiking gesture: keep calm and don’t panic.

The best advice in the galaxy applies to unexplained headaches. Even a lot of really serious ones.

Is headache a symptom of COVID-19? (Or other common infections?)

It’s not one of the “classic” COVID-19 symptoms, but it’s certainly possible — in 8% of cases according to one report,17 14% of cases in another.18 That’s roughly the same percentage of patients suffering from widespread body aching, and so headache is probably mostly just a part of that phenomenon.

The symptoms of most infections are not directly caused by damage they do to our tissues, especially at first. We cannot feel cells being killed by the SARS-CoV-2, or any other virus; what we actually do feel is our immune system’s reaction to the invasion. One purpose of that reaction is to force us to stay still — also know as rest — mostly by making movement feel incredibly difficult and unpleasant. This “sickness behaviour” is a generalized reaction to a wide variety of biological threats found in all animals.19 However, it seems to be particularly prominent in COVID-19.20

So why do only 14% of COVID-19 patients get a headache? Some people are more vulnerable to developing headaches, and an infection can expose that vulnerability because the cytokines lower our pain threshold dramatically, making everything and anything more likely to hurt. It’s also possible that the variation in symptoms is due to what tissues are initially infected.

What’s the worst case scenario for tension headaches?

“I don’t know, I can imagine quite a bit.”

Han Solo, Star Wars Episode IV

I’ll start this off with my own example: in the fall of 2017, I had a mild tension headache for several weeks, almost non-stop (just one piece of my own chronic pain problems). It would surge up to moderate severity in the evenings, and there were a few patches that were impressively bad, but it was the grind of constant pain, regardless of severity, that I think really took its toll on me.

And this is a fairly typical example of the most common worst case scenario: not especially crippling in any given moment, but still severe and exhausting. The grind is part of the severity of the pain, which anyone with chronic tension headaches can relate to. Here’s what an old friend of mine had to say about it, and he has a lot more experience with that grind:

I find low level chronic pain much worse than infrequent acute pain. It is a weird thing (maybe not for someone with your knowledge base) that I can easily shrug off significant pain like getting kicked in the face in martial arts … but steady low level stuff like headaches mentally breaks me pretty quickly.

I didn’t properly appreciate this until I’d felt it. There is nothing “mild” about mild pain when it just won’t let up. It’s hard for me to imagine what a whole year of that would be like; a couple months was bad enough. As is so often the case, one must live with a problem to really understand it. More and more, I wonder how I could possibly publish a good website about pain if I didn’t also suffer from it. “Lucky” for me, I do have that experience.21

The worst possible tension headaches

Headaches are so common and diverse that nearly anything is possible. Billions of people, hundreds of millions of headaches… somewhere out there, there are people with some truly spectacular headaches. Sky’s the limit.

What if we consider primary tension headache alone? There’s still extraordinary potential awfulness in such a huge population, but there probably are limits: tension headaches probably can’t actually knock someone down and keep them there, assuming there really is nothing else worrisome going on. Even the worst intensity will come in waves, easing with sleep or rest or time; and headaches that drag on for years and decades, effectively permanent, won’t be constantly disabling. Extremes of both intensity and chronicity are possible with tension headache, but probably not both. A headache that is continuously disabling for long periods is almost certainly not just a tension headache.

See the footnotes for three examples, spanning the range from “definitely possible for a tension headache”22 to “it might be possible but a bit unlikely”23 to to “there’s probably something else going on here.”24

So the worst average25 case scenario is “just” the “annoyance” of chronic headaches … plus their worst common consequences, insomnia and exercise intolerance, which in turn has even more serious consequences, especially other kinds of pain. People with bad, chronic headaches are in significant long term danger of poor health.

Although tension headaches can be amazingly severe — again, they can be more savage than lesser migraines — even the worst aren’t dangerous in the short term. (This also applies to migraines, even though they can be bad enough to crush your will to live.) The main thing is just to recognize — with expert help — when a headache is not just a headache. Consider the chilling (but entertaining) story of scientist Yvette d’Entremont:

I got the worst headache of my life and it didn’t go away. This horrible ache took residency behind my left eye and refused an eviction notice. I consulted endless doctors and it took eight months to find the first doctor who would start getting my headaches under control …

After a multi-year diagnostic odyssey, Yvette’s headaches proved to be caused by a combination of two medical problems (Ehlers Danlos Syndrome and celiac disease). So, again, odd severe headaches should always be taken seriously.

GO TO TOPCONTENTSNOTES

Tension headache vs. migraine

Tension-type headaches are more common than all other types put together, by a long shot. But heads can ache in many ways. So many ways! You would not believe. And so confirming a headache type can be difficult or impossible.

Tension and migraine headaches are the main primary headaches — headaches that are the main problem, rather than being a mere symptom of some other problem, like dehydration/hangover headaches, which are secondary. But a headaches primary-ness is only a function of our ignorance of the specific cause. “Primary” headache is really just another way of saying “unexplained” headache. The moment a specific cause for a headache is identified, in a •poof• of nomenclatural smoke, the headache is demoted to secondary, and becomes a symptom of whatever we know to be causing the problem.

Migraines have many distinctive features, because they involve brain function. As mentioned above, although migraines are often severe, the word migraine is not just a way to say “it’s a really bad headache.” A migraine is a different kind of headache. They usually stick to one side of the head (except in kids), typically in front or near the temple. They last for at least a few hours and as long as (ugh!) three days. The pain is related to brain blood vessels, so migraines are often pound in sync with your pulse (or possibly alpha brain waves—it’s complicated). Light sensitivity is common and can be severe. Migraines may be caused or aggravated by physical exertion, or triggered by foods and smells, most famously (and depressingly) wine and chocolate. And there needs to be a pattern of at least several attacks for an official diagnosis.

And finally, the most distinct feature of migraines, the infamous “aura”: weird visual, auditory, and other neurological disturbances27 that develop over 5-20 minutes and last for about an hour. Migraine auras are a warning sign that a migraine headache may follow, but not all migraines have auras … and not all auras are followed by migraines.

It’s also possible to have a variety of other migraine warning symptoms for up to a day or two beforehand: fatigue, mental fog, neck stiffness, constipation, strong food cravings.

If any of this weird migraine stuff sounds like you, then you probably do not have tension headaches. Or not just tension headaches, at any rate — people who get migraines can also get tension headaches.

Here’s a more detailed version of the tension headaches vs. migraine table:

Tension Headache vs Migraine: What’s the Difference? More detail!
Tension Headache Migraine
musculoskeletal pain, especially spreading into the head from the jaw and neck neurological “brain ache”, formerly classified as a “vascular” headache but no more (“it’s complicated”)
mostly less awful, but severe tension headaches are just as bad as any migraine often worse, but they actually can be milder than tensions headaches (or even painless, consisting only of non-pain neurological symptoms)
often on both sides usually just one side
feels like pressure, tightness feels like throbbing with pulse
noise sensitivity light sensitivity and visual disturbances common
smell intolerance (osmophobia) never occurs with tension headache occurs in ~40% of case
no weird symptoms, though they can be bad enough to cause malaise many weird symptoms, particularly sensory disturbances, auras and prodromal symptoms

GO TO TOPCONTENTSNOTES

Other primary headache types: cluster, exertional, thunderclap, hypnic, and more

There are two major primary headaches, the migraines and the cluster headaches, and then a large “other” category. This section is devoted to those others.

None of these headache types are common.

Cluster headaches are cousins to migraines, but are more severe, distinctive, eye-o-centric, and a hundred times less common. While migraines can be mistaken for tension headaches, cluster headaches cannot: they are just too awful and odd. The pain is almost always around and/or above one eye and/or the temple, and that eye may droop, leak, and swell. Victims often pace miserably, agitated and restless. These headaches occur in clusters of many headaches for a while (and then there’s nothing for weeks, months, or even years).

The other primary headaches (though several of these could also be symptoms of other conditions). Notice how these tend to just be descriptive names — because that’s all we’ve got.

GO TO TOPCONTENTSNOTES

The secondary headaches (when headache is a symptom or complication of something else)

Hopefully I don’t need to explain that hangovers can cause headaches. But did you know that your brain might be leaking? Or full of tape worm eggs? Or that there’s a kind of stroke that results in only a headache? Some headache causes are quite sneaky and bizarre.

For instance, long ago a man hid a little wad of marijuana up his nose, and then lost it up there and forgot it for almost twenty years — oops! — until it started causing severe headaches:

Through the years he suffered recurring sinus infections and had trouble breathing out of the right side of his nose. But he didn’t connect the problems to his lost cannabis. It wasn’t until 18 years later — when he was struggling with headaches and had a CT scan of his brain — that doctors finally discovered the petrified pot.

That is a perfect, bizarre example of a secondary headache.

So obviously almost anything can give you a headache, but here’s some carefully selected examples where the cause of a headache could easily be overlooked or misunderstood. A headache that has a clear cause is secondary to that cause, a symptom rather than the disease. And of course there’s a big murky gray zone between primary and secondary headaches.

None of the serious causes of secondary headache are common. Even the most common serious ones are extremely unlikely to be the explanation for any one person’s headache. All possible secondary causes of headaches combined are fairly common, though. They add up to common!

Aneurysm, a torn artery in the neck, is the most worrisome common cause of headaches that can actually pass for a tension headache, at least at first. In addition to the large carotid artery, small arteries in the side of the neck supply the brain with blood, the vertebral arteries. These arteries are somewhat vulnerable to being pinched off or even torn. If the artery actually tears, which can cause brain damage due to the loss of blood supply to the brain, it’s called vertebral artery “dissection,” or VAD.

Distrubingly, VAD may only cause neck/head pain — no other symptoms — which is disturbingly little indication of a dangerous injury. It’s not clear how common these pain-only cases are, but it’s at least one in ten in the first day or two.29 As time goes on, the symptoms are likely to get too strong and weird to pass for tension headache. But it is hypochondriac nightmare fuel, because it’s a serious problem that can pass for an ordinary, common one. But it’s not a perfect mimic: the pain is usually severe, one-sided, with an unfamiliar quality (usually throbbing and constrictive). It is an injury, and it probably feels like it if you stop and think about it. For more information, see When to Worry About Neck Pain … and when not to!

Anxiety is a potent driver of practically every conceivable kind of pain, but headaches are right at the top of the list (along with chest pain). Even normal stress can do this, but when worries are severe and prolongued, headaches are a super common symptom. Headaches are a standard sideshow to panic attacks.

Jaw trouble is strongly linked to headaches (temporomandibular joint syndrome and bruxism, teeth grinding). Jaw pain is dominant in most patients, unlikely to be missed. But, for a few (probably less than 5%) the main symptom is actually headache, and the connection doesn’t get made. I will devote a chapter to the jaw’s role in headache.

Eye strain is also strongly linked to headaches. As with jaw trouble, it’s usually obvious that the headache is secondary — but not always.

Cerebrospinal spinal fluid leaks — literally leaks in the membrane that wraps your brain and spinal cord — are often subtle, causing mainly headaches and face, neck, and arm pain, although there’s a laundry list of other odd symptoms. The big clue is that these headaches flare when you’re upright. Despite this signature symptom, CSF leaks often go undiagnosed. If you have chronic headaches that usually feel better on your back, and especially if your health feels a bit fragile in general, definitely look into this: Upright Headache? Think CSF Leak! For many patients, just the words “upright headache” will spark a revelation.

Temporal arteritis [healthline] is an inflammation of arteries in the temple, with a lot of symptoms: severe headache, fever, scalp tenderness, jaw pain, vision trouble, and ringing in the ears are all possible symptoms, along with neck pain. It’s almost unheard of in people younger than 50, and it usually occurs in people with other diseases or infections. However, it may be possible to have a relatively minor case bad enough to cause pain but not severe enough to be easily diagnosed.

Post-concussion syndrome [Mayo] involves a lot of headaches. Yes, it’s true: a sharp blow to the head can cause headaches! You heard it here first. PCS is “a complex disorder in which various symptoms — such as headaches and dizziness — last for weeks and sometimes months after the injury that caused the concussion.” Post-concussion headaches cannot be directly treated — they are “brain aches” caused by direct trauma to the brain — with the possible exception of exercise.30 Obviously that is not a tension headache, but the pain might lead to tension headaches as a complication, which might partly explain why recovery time from post-concussion syndrome is so notoriously unpredictable.31 And there could be involvement of other tissues in many cases, such as trauma to musculoskeletal structures throughout the head and neck (especially whiplash), causing cervicogenic headache. And so even though the pain of post-concussion syndrome headaches can’t be directly treated, it may come with other types of headache that can be.

Drug side effects and withdrawal. Drug side effects are probably a common sneaky cause of headaches (related: side effects of some food additives, like perhaps MSG, more on this below). More surprising is that headaches are a side effect of pain-killers, which seems tragically unfair, like coffee that makes your drowsy. But it’s for real, and it’s known as medication-overuse headache (MOH). When you take a lot of pain killers, they may pre-empt the production of your body’s own pain-fighting chemistry, and that can have nasty consequences when you stop taking the drugs, resulting in worse pain than ever. This is part of the phenomenon of the well-known and serious withdrawal symptoms from some drugs; it is a less well-known problem with over-the-counter pain-killers. Given how common analgesic usage is, some people with recurrent headaches are probably suffering from bouts of rebound pain, occurring in the occasional gaps between erratic but generally excessive use pain killers. Definitely something to watch out for. I will devote a whole chapter to this topic.

Chronic sinus inflammation is probably a surprisingly common cause of headaches. Acute sinusitis is not subtle, but chronic inflammation from chronic infection or allergies can be surprisingly hard to nail down, and remarkably similar to tension headaches. Or you could have both, because having chronically painful sinuses is stressful!

A few other possibilities:

GO TO TOPCONTENTSNOTES

Part 3

Causes of Headache

Major factors in so-called tension headaches and other unexplained headaches

This part of the tutorial discusses the causes of headache, but it can also be seen as “diagnosis continued.”

For this topic, diagnosis is hard to separate from etiology (the nature of the beast). In most of my books, I talk about the nature of a problem before I talk about how to confirm the diagnosis. But it’s the other way around here, because you can’t talk about headache causes until it’s clear what kind of headache we’re talking about — and so it seemed important to explain and eliminate a whole bunch of other possibilities first.

And yet even “tension” headache is not one thing, not even remotely. It breaks down into many possible specific causes that make the label of “tension” irrelevant. And every one of thoses causes has distinct diagnostic implications. So this isn’t just about the causes of tension headaches, but the causes of any kind of headache that can’t easily be diagnosed, and digging into them will suggest more diagnostic possibilities.

One of the best examples is using a cervical nerve block — injecting a numbing agent to see if the pain is coming from the neck. If the pain goes away, bingo, you’ve discovered that a neck issue is the cause of your headache — not tension. A nerve block is not a big deal, but a needle deep in the upper neck isn’t a trivial procedure either. For most patients, it will never even be on the radar as an option.

So cause and diagnosis are basically impossible to separate with headache. Every major cause needs its own diagnostic approach. So we’ll continue the diagnosis/cause discussion with the mother of all plausible, common “tension” headache causes: the cervicogenic or neck-powered headache.

From the neck or not? The cervicogenic headache debate

“Jane” was a nurse, just 23 years old, and she’d had the same headache since she was 20, a constant throb on the right right side of her head. She worked in a radiology department, and had to wear a lot of lead aprons. She blamed those heavy aprons for the headache, always dragging her down.

She had an acutely sensitive spot on the back right side of her neck, though, just a handful of inches south of the pain. And she had more pain every time she turned her neck that way.…

END OF FREE INTRODUCTION

Purchase full access to this tutorial for USD$1995. Continue reading this page immediately after purchase. A second tutorial about muscle pain is included free. See a complete table of contents below. Most content on PainScience.com is free.?

 Out of work because of COVID-19? I’m offering a 50% rebate to anyone un- or under-employed because of this pesky plague.details ~ Paul Ingraham, Publisher


BUY NOW $1995 USD
Logos for Visa, Mastercard, and Amex.I accept Visa, Mastercard, and American Express. Discover and JCB are not supported for now, but I hope that will change in the not-too-distant future. Note that my small business does not handle your credit card info: it goes straight to the payment processor (Stripe). You can also pay with PayPal: for more information, click the PayPal button just below.
PayPal logo
read on any device, no passwords
refund at any time, in a week or a year
call 778-968-0930 for purchase help
ID  Vendor Information
company PainScience.com
owner Paul Ingraham
contact 778-968-0930
refunds 100%, no time limit +Customers are welcome to ask for a refund months after purchase — I understand that it can take time to decide if information like this was worth the price for you. Learn more about refunds, security, and privacy ❐.
payments

Plus …

Part 3.2

Appendices

Related Reading

GO TO TOPCONTENTSNOTES

What’s new in this article?

This article was originally published in 2004, and evolved slowly for more than a decade before I got more serious about updating it in 2016. Updates have been fairly regular and logged ever since.

Regular updates are a key feature of PainScience.com tutorials. As new science and information becomes available, I upgrade them, and the most recent version is always automatically available to customers. Unlike regular books, and even e-books (which can be obsolete by the time they are published, and can go years between editions) this document is updated at least once every three months and often much more. I also log updates, making it easy for readers to see what’s changed. This tutorial has gotten 70 major and minor updates since I started logging carefully in late 2009 (plus countless minor tweaks and touch-ups).

July — New content: Added coat hangar pain from orthostatic hypotension to the collection of more exotic types of cervicogenic headache. [Updated section: More exotic cervicogenic headaches.]

July — Science update: Cited a nail-in-coffin 2020 study of dry needling for neck pain. [Updated section: Massage, self-massage, and other trigger point therapies for headache.]

July — Science update: Added more detail and citations about headaches caused by physical irritation around the head, including (sigh) personal protective equipment like face masks. [Updated section: Hats off! Eliminate minor sources of physical stress that cause headache.]

May — New content: Added a substantial new sub-section, “Trigger points, schmigger points: the many other kinds of muscle injury and dysfunction.” [Updated section: More exotic cervicogenic headaches.]

April — COVID-19 update: Added information about headaches as a symptom of COVID-19. [Updated section: Diagnosis of Headache: When to worry about a headache (and when not to).]

March — More information: Expanded the description in the spirit of helping people understand “what to expect,” what are the limits, with some new examples. [Updated section: What’s the worst case scenario for tension headaches?]

February — Upgraded: More detail, more references, and more advice. [Updated section: Pills, pills, pills: treating headache with over-the-counter pain-killers.]

February — New chapter: No notes. Just a new chapter. [Updated section: Medication-overuse headaches (AKA rebound headaches) and other medication madness.]

January — New chapter: Alcohol has come up in a variety of ways. There’s a need to reconcile them. [Updated section: A bit more about booze.]

2019 — Major upgrade: More detail, editorial colour, and references. [Updated section: Botox for chronic daily headaches.]

2019 — Book launch: The headache guide has been free since I first introduced it in the early 2013. Six years and hundreds of hours of development later, it joins my inventory of full-blown books. It’s the second addition in 2019 (after frozen shoulder this summer), after years without any new ones. It is now for sale for $20 USD. All existing boxed set customers will have access automatically — someone who bought a set in 2009 is getting a new book out of that purchase a decade later.

2019 — New chapter: No notes. Just a new chapter. [Updated section: Soothing the jaw: managing jaw clenching, grinding, and chronic pain.]

2019 — New chapter: No notes. Just a new chapter. [Updated section: The role of the jaw (and the muscle most likely to put the “tension” into a tension headache).]

2019 — New chapter: No notes. Just a new chapter. [Updated section: Muscle relaxants (Robaxin, Robaxacet, etc), psychoactives, and sedatives.]

2019 — New chapter: No notes. Just a new chapter. [Updated section: The cannabinoids: marijuana and hemp, THC and CBD — “it’s complicated!”.]

2019 — Added colour: Added a minor but very amusing anecdote about a bizarre cause of headaches. [Updated section: The secondary headaches (when headache is a symptom or complication of something else).]

2019 — New chapter: No notes. Just a new chapter. [Updated section: Interlude: Nora’s headache story — blurring the line between tension headache and migraine.]

2019 — Science update: Added references to support “arthritis isn’t wear-and-tear.” Substantial additional editing and clarifications throughout the chapter. [Updated section: Subluxation: can your neck be “out”? What goes wrong with neck joints anyway?]

2019 — Major upgrade: Much more detailed discussion of spinal manipulative therapy. [Updated section: Chiropractic and spinal manipulative therapy (SMT): Adjustment, manipulation and cracking of the spinal joints.]

2019 — Minor maintenance: Updated about a dozen broken links.

Archived updates — 50 additional older updates are listed on another page. ❐

2004 — Publication.

GO TO TOPCONTENTSNOTES

Acknowledgements

Thanks to every reader, client, and book customer for your curiosity, your faith, and your feedback and suggestions, and your stories most of all — without you, all of this would be impossible and pointless.

Writers go on and on about how grateful they are for the support they had while writing one measly book, but this website is actually a much bigger project than a book. PainScience.com was originally created in my so-called “spare time” with a lot of assistance from family and friends (see the origin story). Thanks to my wife for countless indulgences large and small; to my parents for (possibly blind) faith in me, and much copyediting; and to friends and technical mentors Mike, Dirk, Aaron, and Erin for endless useful chats, repeatedly saving my ass, plus actually building many of the nifty features of this website.

Special thanks to some professionals and experts who have been particularly inspiring and/or directly supportive: Dr. Rob Tarzwell, Dr. Steven Novella, Dr. David Gorski, Sam Homola, DC, Dr. Mark Crislip, Scott Gavura, Dr. Harriet Hall, Dr. Stephen Barrett, Dr. Greg Lehman, Dr. Jason Silvernail, Todd Hargrove, Nick Ng, Alice Sanvito, Dr. Chris Moyer, Lars Avemarie, PT, Dr. Brian James, Bodhi Haraldsson, Diane Jacobs, Adam Meakins, Sol Orwell, Laura Allen, James Fell, Dr. Ravensara Travillian, Dr. Neil O’Connell, Dr. Tony Ingram, Dr. Jim Eubanks, Kira Stoops, Dr. Bronnie Thompson, Dr. James Coyne, Alex Hutchinson, Dr. David Colquhoun, Bas Asselbergs … and almost certainly a dozen more I am embarrassed to have neglected.

I work “alone,” but not really, thanks to all these people.

I have some relationship with everyone named above, but there are also many experts who have influenced me that I am not privileged to know personally. Some of the most notable are: Drs. Lorimer Moseley, David Butler, Gordon Waddell, Robert Sapolsky, Brad Schoenfeld, Edzard Ernst, Jan Dommerholt, Simon Singh, Ben Goldacre, Atul Gawande, and Nikolai Boguduk.

GO TO TOPCONTENTSNOTES

Notes

  1. Stovner L, Hagen K, Jensen R, et al. The global burden of headache: a documentation of headache prevalence and disability worldwide. Cephalalgia. 2007 Mar;27(3):193–210. PubMed #17381554 ❐ “Globally, the percentages of the adult population with an active headache disorder are 46% for headache in general, 11% for migraine, 42% for tension-type headache and 3% for chronic daily headache. Our calculations indicate that the disability attributable to tension-type headache is larger worldwide than that due to migraine. On the World Health Organization's ranking of causes of disability, this would bring headache disorders into the 10 most disabling conditions for the two genders, and into the five most disabling for women.”
  2. Many people assume “migraine” is just a word for a really bad headache, and some people even dramatically boast about the severity of tension headaches by calling them “migraines.” But a migraine is definitely a different kind of animal than an ordinary headache. If you can walk around talking about the fact that you have a migraine, you probably don’t have a migraine. Although they can be tolerable in their early stages, and some can even be surprisingly mild, as a general rule they are much more serious than the worst tension headaches. Most migraines will have their victims flat on their backs in a darkened room.
  3. There are literally hundreds of defined types of headaches, based on an stupendous variety of known causes, and plenty more than are just an unexplained but distinctive pattern of symptoms.
  4. Does dehydration cause headaches? How about MSG? Is red wine a headache “trigger”? If tension is the problem, why don’t muscle relaxants work? Do you really need a mouth guard for your clenching and grinding? All this an more will be discussed.
  5. Martin PR. Stress and Primary Headache: Review of the Research and Clinical Management. Curr Pain Headache Rep. 2016 Jul;20(7):45. PubMed #27215628 ❐ “…although some researchers have questioned whether stress can trigger headaches, overall, the literature is still supportive of such a link.”
  6. As opposed to the neurological “brain ache” of migraine. Or the pathological and traumatic causes of some other headaches (like inflamed arteries, brain damage, drug side effects, and so on). There will be much more about other possible causes of headaches below.
  7. Espay AJ, Aybek S, Carson A, et al. Current Concepts in Diagnosis and Treatment of Functional Neurological Disorders. JAMA Neurol. 2018 09;75(9):1132–1141. PubMed #29868890 ❐
  8. Truly pure psychosomatic pain is probably a real phenomenon, but it’s not as clear as it should be. The strange-but-true phenomenon of functional neurological disorders is well-studied: seizures, paralysis, blindness, and other neurological symptoms in the absence of any neurological disease (see Espay et al for a scholarly source, or this more accessible talk: Suzanne O'Sullivan @ 5x15 — The reality of imaginary illness 19:30). If we can paralyze ourselves with our minds, we can probably make ourselves hurt too.
  9. The closest thing to persuasive evidence of a link between headache and muscular tension is a 1991 survey of headache patients (see Lebbink et al) which found quite a strong link: much higher prevalence of neck muscle tension in headache sufferers especially, plus other links. More about these results later.
  10. So-called “muscle knots” — AKA trigger points — are small unexplained sore spots in muscle tissue associated with stiffness and soreness. No one doubts that they are there, but they are unexplained and controversial. They can be surprisingly intense, cause pain in confusing patterns, and they grow like weeds around other painful problems and injuries, but most healthcare professionals know little about them, so misdiagnosis is epidemic.
  11. Fernández-de-Las-Peñas C, Simons D, Cuadrado ML, Pareja J. The role of myofascial trigger points in musculoskeletal pain syndromes of the head and neck. Current Pain & Headache Reports. 2007 Oct;11(5):365–72. PubMed #17894927 ❐

    This review of the scientific literature, unfortunately, has little scientific literature to review: not much research has been done on the relationship between trigger points and neck pain, and — as is so often the case in musculoskeletal health care — “additional studies are needed.” However, the authors suggest that “it seems that the pain profile of neck and head syndromes may be provoked referred pain from TrPs in the posterior cervical, head, and shoulder muscles” and that there is some evidence “that both tension headache and migraine are associated with referred pain from trigger points.”

  12. This is a bit sneaky of me, a convenient dodge around the controversy about the nature of trigger points. If the feeling of tension either is a literal contraction, or it just feels that way, I’ve covered all my bases. My money is on literal contraction, but I realize that there’s a lot of scientific uncertainty about that. The subjective sensation of contraction and tightness, however, is indisputable: most of the human race knows that feeling, and doesn’t hesitate to describe it like it’s a contraction. And the simplest explanation for the sensation would probably be that trigger points hurt even if they aren’t actually little contractions, and our brains interpret “uncomfortable movement” as “tightness.” I go into considerable detail about the sensation of tightness in another article: You’re Really Tight: The three most common words in massage therapy are pointless.
  13. Bogduk N, Govind J. Cervicogenic headache: an assessment of the evidence on clinical diagnosis, invasive tests, and treatment. Lancet Neurol. 2009 Oct;8(10):959–68. PubMed #19747657 ❐ “Although the International Headache Society recognises this type of headache as a distinct disorder, some clinicians remain sceptical.” I’ll return to this topic in more detail later in the tutorial.
  14. Devenney E, Neale H, Forbes RB. A systematic review of causes of sudden and severe headache (Thunderclap Headache): should lists be evidence based? J Headache Pain. 2014;15:49. PubMed #25123846 ❐ PainSci #53381 ❐ Thunderclap headaches have literally dozens of possible causes, some scary, some not so scary. The classic scary cause is brain bleeding (mostly subarachnoid hemorrhages), and it’s important to rule this out … and in many cases it is ruled out. Most cases are never explained and never amount to anything. And there’s the cases caused by eating extremely hot chili peppers. “What could possibly go wrong?” Here’s the news story, and the case report in the British Medical Journal.
  15. Severe throbbing or constrictive neck and/or head pain may be the only symptom of an artery tear (see Arnold, Kerry, Maruyama) with a high risk of a stroke, but it is almost always a strange pain: Arnold et al reported that most patients “considered the pain to be unique and unusual compared with previously experienced headache or neck pain episodes. Nevertheless, pain was often interpreted initially as migraine or musculoskeletal in nature by the patient or the treating doctor.” See scary causes of neck pain for more detailed red flag information about this.
  16. Especially weakness, disturbed vision, or any other neuro-ish symptom. Obviously it’s an emergency if you detect any of the big-three stroke signs: face drooping, arm weakness, speech difficulty.
  17. Lei S, Jiang F, Su W, et al. Clinical characteristics and outcomes of patients undergoing surgeries during the incubation period of COVID-19 infection. EClinicalMedicine. 2020 2020/04/06. PainSci #52605 ❐
  18. Report of the WHO-China Joint Mission on Coronavirus Disease 2019 (COVID-19). Accessed 2020-04-06.
  19. Ingraham. Chronic, Subtle, Systemic Inflammation: One possible sneaky cause of puzzling chronic pain.  ❐ PainScience.com. 7109 words.
  20. This virus seems to provokes more cytokine production than, say, the common cold, and it’s the cytokines that primarily cause the symptoms of “sickness behaviour.” It’s also probably prone to it because it’s a more serious infection — they call it the “novel” coronavirus because it’s new to us, a virus too different from other coronaviruses for our immune system to have any experience with it.
  21. I had always been “prone” to aches and pains, which is really why I started this website. But in 2015 I graduated to the pain big leagues: serious chronic pain, fatigue, and exercise intolerance plus many other bizarre symptoms, all unexplained, making me a classic fibromyalgia patient. You can read my chronic pain story on my personal blog: “Chronic Pain & Tragic Irony.”
  22. Alan’s headaches are nasty by most people’s standards, but still well within the realm of possibility for tension headaches. He has a low-grade dull throb in the back of his head almost all the time. It usually worsens throughout the day, but he can still work and play through the fog of discomfort. Roughly weekly, he has a flare-up of pain intense enough to stop normal activity; he could still function in an emergency, but he usually just goes to bed early and it’s back to the dull throb in the morning, like a mild hangover.
  23. Judith’s headaches are bad enough for their nature to be ambiguous: can a tension headache really be this bad? It is possible, but at this level you do have to start wondering if there’s more going on. Judith has pain as constant as Alan’s but more intense: it’s almost always hard for her to think clearly, hard to speak and make normal facial expressions, hard to sleep and exercise — some days she can, some she can’t. She can usually muddle through at work, but she takes all her sick days, usually to accommodate her occasional episodes, which are are as harsh as any migraine she’s ever heard of (but without classic migraine symptoms), until she regresses to her miserable mean.
  24. Aaron’s headaches are too severe not to strongly suspect something more than “tension.” Like Judith, his pain is substantial and constant and has been for a long time, but he also has severe episodes that develop rapidly, and are so frequent and disabling that he can’t hold down a normal job, so he’s become erratically self-employed and financially stressed. He almost never can sleep or exercise properly, and so he feels like he’s aging rapidly, and is starting to develop widespread aches and pains. Theoretically all of this could still be “just” a tension headache, but it would have to very rare.
  25. Not the very worst possible. In this reckoning, we trim off the extreme outliers, and just consider the average of all other cases that would be considered severe.
  26. Zanchin G, Dainese F, Trucco M, et al. Osmophobia in migraine and tension-type headache and its clinical features in patients with migraine. Cephalalgia. 2007 Sep;27(9):1061–1068. PubMed #17681021 ❐
  27. Seeing shapes, bright spots, flashes. Hearing noises or music. Jerking or twitching. Pins and needles in an arm or leg. Trouble speaking. Just about anything hallucinatory or brain-disturbed. People with migraine auras sometimes think they are have a stroke.
  28. “Not tonight, honey, you’ll give me a headache.”
  29. Headache-only VAD might be anywhere from 10 and 50% of cases. The uncertainly is probably because it matters when you ask: the symptoms can evolve over several days, as with any injury. Arnold 2006, Kerry 2009, and Maruyama 2012 all propose lower numbers. Bogduk, a particularly expert source cited a lot in this guide, goes much higher:

    Sixty percent of patients with aneurysms of the vertebral artery or the internal carotid artery present with headache as the sole feature. Within a matter of a few days, aneurysms typically declare themselves by the onset of neurovascular features. However, during this period, the headache may be misdiagnosed as common cervicogenic headache, unless the practitioner is alert to the possibility of aneurysm.

  30. Leddy JJ, Haider MN, Ellis M, Willer BS. Exercise is Medicine for Concussion. Curr Sports Med Rep. 2018 Aug;17(8):262–270. PubMed #30095546 ❐ PainSci #52267 ❐
  31. More from the Mayo Clinic resource page on post-concussion syndrome: “In most people, post-concussion syndrome symptoms occur within the first seven to 10 days and go away within three months, though they can persist for a year or more.”
  32. Jy Ong J, Bharatendu C, Goh Y, et al. Headaches Associated with Personal Protective Equipment - A Cross-sectional Study Amongst Frontline Healthcare Workers During COVID-19 (HAPPE Study). Headache. 2020 Mar. PubMed #32232837 ❐ This is just a survey of nurses who already had a headache problem, who “either 'agreed' or 'strongly agreed' that the increased PPE usage had affected the control of their background headaches.” There’s more substantive evidence that I will discuss below.

There are 165 more footnotes in the full version of the book. I really like footnotes (and I try to have fun with them).


BUY NOW $1995 USD
Logos for Visa, Mastercard, and Amex.I accept Visa, Mastercard, and American Express. Discover and JCB are not supported for now, but I hope that will change in the not-too-distant future. Note that my small business does not handle your credit card info: it goes straight to the payment processor (Stripe). You can also pay with PayPal: for more information, click the PayPal button just below.
PayPal logo
read on any device, no passwords
refund at any time, in a week or a year
call 778-968-0930 for purchase help