What causes migraines?

Researchers haven’t identified a definitive cause for migraines. However, they have found some contributing factors that can trigger the condition. 

• This includes changes in brain chemicals, such as a decrease in levels of the brain chemical serotonin.
• Other factors that may trigger a migraine include bright lights, severe heat, or other extremes in weather, dehydration, hormone changes, excess stress, loud sounds, intense physical activity, skipping meals, changes in sleep patterns, use of certain medications, smoking, alcohol use, etc.