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You're hormonal

The dip in estrogen that occurs just before your period can lead to migraines. Similar hormonal fluctuations can also trigger headaches during pregnancy, perimenopause, and menopause. 

Take an over-the-counter nonsteroidal anti-inflammatory drug (NSAID) like naproxen or ibuprofen two days before you expect your period, when the headache is likely to happen. If you're experiencing headaches during pregnancy, ask your doctor to recommend a pain-relief plan