A man hid a little wad of marijuana up his nose… and lost it for almost twenty years. Oops.
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’s a good one for my collection of surprising causes of pain file. Doesn’t get much more surprising than that.