How a Migraine Happens

Although there is general agreement among healthcare providers and researchers that a key element in migraines is blood flow changes in the brain, the exact cause of migraine headaches remains unknown.

What commonly triggers a migraine?

People who get migraine headaches seem to have blood vessels that overreact. Some triggers of a migraine may include the following:

• stress and other emotions
• biological and environmental conditions
• fatigue
• glaring or flickering lights
• weather
• certain foods