Triggers can be different for all people. Identifying your most common triggers may help you steer clear of them. These are some of the top triggers from The National Headache Foundation
Stress: Everyday hassles like running late for an appointment or working long hours to meet a deadline can cause nerve irritation and inflammation. Experiencing letdown after stress can have the same effect. "The migraine doesn't happen when you finish your deadline but it can happen the next day" says Stephen D. Silberstein, MD, professor of neurology and Director of the Jefferson Headache Center at Thomas Jefferson University in Philadelphia.
Alchohol: Alchohol causes nerve irritation. Also, many sufferers are sensitive to chemicals in red wine, scotch and bourbon.
Food/food additives: You may be sensitive to chemicals in chocolate and aged cheeses, as well as additives like the artificial sweetener aspartame. Other common culprits include raw onions, citrus fruits and juices, processed meats, the flavor enhancer MSG and sulfite preservatives found in baked goods and canned food.
Glare: Nearly 90% of all migraine sufferers are sensitive to light. In a study published in Nature Neuroscience, researchers discovered a pathway in the brain that links the visual system to that which produces head pain.
Hormone Changes:Sixty percent of women who suffer from migraines do so when estrogen levels drop (such as before menstruation starts)
Intense exercise: It seems to help release nitric oxide - which can cause nerve irritation.
Cigarette smoke: It can cause nerve irritation.
A change in weather: Changes in barometric pressure and cold or humid weather can alter your body's chemical balance.