Eli5: What exactly is happening when you get a headache
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There’s maybe a dozen kinds of headaches and a dozen more causes for a headache. For example, I get sinus headaches. Those heachaches are caused by the tissues in my sinus cavities getting inflamed and not having anywhere to expand. On the other hand, I also get caffeine withdrawl headaches when I don’t get my coffee. This is because caffeine causes the blood vessels to tighten and when they expand again they put pressure on the surrounding tissues.
There’s also psychosomatic headaches, muscle ache headaches, infections, and migraines. We really don’t understand what causes Migraines so they get their own category.
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