(HealthScoutNews) -- A surprising number of children -- more than eight million, or 15 percent of all children by age 15 -- suffer from migraine headaches, according to the American Medical Association.

For many, these severe headaches often stop as their young sufferers grow into adulthood. But they often return in middle age.

Before puberty, migraines hit boys as often as they do girls. But as with adults, girls are the main victims among adolescents. And 70 percent of all youthful sufferers have a family history of migraines.

Physicians believe the cause of migraines is the same in children and adults, but the former often exhibit different symptoms. Lacking is the visual aura adults often report. Most common symptoms among kids include nausea and vomiting, diarrhea, increased urination, sweating, thirst, and swelling and tearing.

Children often stop having migraines within a year, even without treatment. But to reduce their impact, doctors usually recommend maintaining regular bedtime and mealtime schedules. Also important, doctors say, is identifying and avoiding the "triggers" that spur a migraine's onset.

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