Headache after menstruation may be migraine, sinusitis, temporal arteritis, etc., and the cause should be identified in time. 1. Migraine: Migraine in primary headache may be related to menstruation. During menstruation, due to fluctuation of hormone level, causing vascular and nerve dysfunction, migraine may be induced. 2. Sinusitis: If a woman has sinusitis in the past, it may recur after menstruation due to low resistance, thus causing postmenstrual headache. 3. Temporal arteritis: After menstruation, the immune system decreases, and if viral or bacterial infection occurs, it can cause an immune response and lead to temporal arteritis, and the patient may also experience headache symptoms. If you have a headache after menstruation, you should consult a doctor in time to clarify the cause of the headache under the guidance of the doctor, and if necessary, carry out appropriate treatment.