There are two main aspects to consider when a headache occurs after eating: the first aspect is the lack of blood supply to the brain. When patients eat, in order to ensure the gastrointestinal tract to digest food, the blood of the whole body will be concentrated to the gastrointestinal tract, and the blood flow to the extremities and brain will be reduced and the symptoms of weakness and headache will appear, and the symptoms of dizziness will also be manifested, mainly due to the insufficient blood supply to the brain. The second aspect is that the headache occurs after eating. Patients should have their blood pressure measured to see if they have high blood pressure after eating, and it is recommended that they have their blood pressure measured and have their heart checked for arrhythmias.