The common causes of headache after menstruation are as follows: 1. Decreased concentration of estradiol and increased secretion of prostaglandins, which may cause fever and lack of sleep. After menstruation, as the concentration of estradiol in the body decreases, it stimulates the expansion of blood vessels in the brain, thus causing headache and dizziness. 2. Prostaglandins secretion increases after menstruation, and prostaglandins can cause vasoconstriction, and headache and dizziness may occur when the blood vessels in the head are constricted. 3. If a cold causes fever after menstruation, headache and dizziness may also occur. 4. If you stay up late after menstruation and do not get enough sleep, you may also have headache. If you have a headache after menstruation, it is recommended that you can get local massage and get enough sleep to relieve it. If the headache is severe and cannot be relieved, you need to go to the hospital in time to avoid delaying the condition.