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Headaches rank among the most common reasons for doctor visits worldwide. A small number are due to secondary causes, such as a brain tumor, cerebral aneurysm, head injury, or infection. Most are tension headaches—diffuse, muscle-related head pain with a tightening, non-pulsating quality—that generally respond to analgesics, sleep, neck exercises, and time. Migraines afflict about ten per cent of people with headaches, but a much larger percentage of those who see doctors, because migraines are difficult to control. - www.newyorker.com