11 Surprising Headache Triggers

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Credit: Corbis

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What's to blame?

by Laurie Herr

Could it be something you ate? Not enough sleep? Our comprehensive list just might help you figure out what's really causing your headache.

Your weight
In a study, researchers found that obese women (a body mass index of 30) had a 35% greater risk of headaches than those with a lower BMI. Severe obesity (BMI of 40) upped the chances to 80%.

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