Headache after eating may be a normal physiological phenomenon, or it may be due to high blood pressure, migraine and other diseases. If it is a normal physiological phenomenon, there is no need to worry and pay attention to the diet in moderation in the future; if it is caused by a disease, you need to go to the hospital for treatment in time to avoid serious consequences. First, physiological factors: 1-2 times occasionally eat support headache, the initial consideration may be a normal physiological phenomenon. Usually due to the large amount of blood concentrated in the gastrointestinal tract after a full meal to digest and absorb food, there is a temporary shortage of blood supply to the brain, which causes cerebral ischemia and hypoxia, resulting in the symptoms of headache, patients without special circumstances generally do not need to deal with. 2. Pathological factors: 1. Hypertension: Patients with hypertension may have accelerated metabolism after satiety, leading to vasodilation in the brain, thus causing headache performance; 2. Migraine: Migraine patients’ headaches are mostly located on the lateral side, with throbbing pain, which can be triggered by some foods or drinks containing substances such as tyramine, nitrite preservatives, phenylethylamine, food additives such as monosodium glutamate and alcohol. Patients can further determine if and what kind of disease is present by monitoring blood pressure and observing the location and nature of the headache. When it is impossible to determine or the pain is unbearable, patients can go to the hospital for some relevant examinations, such as cranial MRI and CT, to clarify the cause.