Topic Overview

Triggers of migraine headaches are different for each person. Triggers include changes in daily routine, foods, hormones, medicines, lights, odours, or other things in the environment.

The most common migraine triggers are:

• Stress (either during a stressful time or right after stress subsides).
• Menstrual cycle in women.
• Changes in your routine, such as how much you exercise or how much you sleep.
• Fasting or skipping meals.
• Changes in the weather, heat, or high humidity.
• Bright lights, glare, or reflected sunlight.
• Foods, such as chocolate.
• Alcohol—all alcohol, or one type of alcohol in particular, like beer or wine.
• Odours such as perfume, paint, dust, and certain flowers.

Other migraine triggers include:

• Strong emotions, such as depression or anxiety.
• Pushing yourself too hard when you exercise.
• Aspartame.
• Monosodium glutamate (MSG).
• Nitrates, which are found in cured meats such as hot dogs, bacon, and cold cuts.
• Tyramines, which are found in pickled or marinated foods, aged cheeses, and yeast.
• Smoking or being around someone who smokes.
• Excessive caffeine or caffeine withdrawal.
• Birth control pills and hormone therapy.
• Medicines that expand (dilate) the blood vessels (vasodilators), such as nifedipine, and nitrates.