Migraine triggers are things thought to bring about migraine in people who are prone to this disease. Triggers vary with the person in question. Individual triggers may include: Certain foods, including chocolate, cheese, nuts, alcohol, and MSG, triggers a headache in some people. (MSG is a food enhancer used in many foods including Chinese food.) Missing a meal oStress and tension also contribute to the risk. People often suffer from migraines during times of increased emotional or physical stress. Birth control pills can be a trigger. Women may have migraines at the end of the pill cycle as the estrogen in the pill is stopped. This known as estrogen-withdrawal headache. Smoking may cause migraines or interfere with their treatment.