What causes chronic migrains?

Many Possibilities: Hormonal changes food food additives stress alcohol sensory stimuli changes in sleep pattern changes in environment physical factors.

Triggers: Migraine is a hereditary condition where the victim is highly sensitive to any event that affects the excitatory neurotransmitter glutamine. Triggers include jaw and dental problems, neck/disc issues, thoracic outlet, head injury, barometric pressure change, various foods or additives, bright sunshine, perfumes, alternating bright colors, lack of sleep, etc.