If you have a headache after eating, you need to consider the following reasons: 1. unhygienic diet, unclean food leads to fever, nausea, diarrhea and other gastrointestinal discomfort after eating, which causes headache and requires active anti-infection and rehydration treatment. 2. blood in the body will be redistributed after meals, with relatively more blood in the gastrointestinal tract and less blood flow to the head, which can lead to headache, dizziness and sleepiness due to lack of oxygen. 3. 3. Hypertension, if you have hypertension in the past, it is easy to get emotional during meals, especially at dinners, which can lead to headaches caused by elevated blood pressure. 4. Cervical spondylosis, keep your head down during meals, if you have cervical spondylosis in the past, it can lead to headaches caused by pressure on sensitive tissues or blood vessels in the head. Take care not to lower your head for a long time, pay attention to dietary hygiene, monitor blood pressure regularly, and maintain a low-salt, low-fat diet.