Last updated: Apr 15, 2009
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Who gets them The most common form of headache, tension-type headaches strike 100 million Americans a year. Some sufferers get them every day.
Who gets them The number of sinus-headache sufferers is unclear, partly because a sinus headache is so often misdiagnosed. (Its often a migraine.)
Who gets them More men than women, with onset typically in the 20s to 40s. (Most frequent onset age for women: 60s.) May be underdiagnosed in African-American women.
Who gets them More women than men. Up to one-fourth of all chronic headaches are believed to be caused by taking too much pain medicine.
Who gets them About 29.5 million Americans. Women are three times more likely to suffer than men.