Question: what are causes of migraine headaches?
Answer: Hormonal changes in women. Fluctuations in estrogen, such as before or during menstrual periods, pregnancy and menopause, seem to trigger headaches in many women. ... 
Drinks. ... 
Stress. ... 
Sensory stimuli. ... 
Sleep changes. ... 
Physical factors. ... 
Weather changes. ... 
Medications.