If a young person has a headache and nausea after eating too much, they can rest in bed once in a while, get enough sleep, and the symptoms will slowly get better. If the symptoms of headache and nausea after eating too much occur repeatedly in young people, blood pressure monitoring is recommended and hypertension may have developed after the meal. If an elderly person shows this condition, it is considered a very rare disease called postprandial hypotension. Due to degenerative brain lesions in the elderly, the plant nervous function is poor, and postprandial hypotension occurs after eating, resulting in insufficient blood supply to the brain and the symptoms of headache and nausea.