Food & food additives, alcohol, especially red wine, nuts, nitrite/nitrate-preserved foods such as hot dogs, pepperoni, smoked or pickled foods.

Strong or glaring light, flickering lights from TV or computer screen, strobe or laser lights, or reflections.

Smells and intense, specific food odors, cigarette or other smoke, perfumes, cleaning products.

Stress, migraine attacks often occur after stress. A vast majority of people mistake these as tension headaches.

Weather Changes, high humidity, atmospheric pressure changes, rapid temperature fluctuations, and exposure to extreme heat or cold may bring on migraine attacks. These are commonly mistaken as sinus headaches.

Changes in sleeping habits, too little, or more often, too much sleep can trigger migraines.

Dieting and hunger or any major change in eating habits such as missing a meal.

Caffeine, having more caffeine than you are used to can trigger migraines.

Hormonal fluctuations, the frequency of women's migraines is sometimes said to be related to hormonal fluctuation, particularly with regard to estrogen. In many women, migraines begin just prior to, or during, their monthly menstrual period, or during treatment with hormone therapy such as birth control pills or estrogen replacement.

(Understanding Migraine Triggers, 1997-2007 Glaxo Smith Kline).