There are three common reasons for patients to have headache and nausea after exercise: 1. Patients may be anemic, because they are weak and cannot adapt to strenuous exercise, their bodies cannot tolerate it after strenuous exercise, resulting in headache and nausea. 2. Patients with hypertension may have higher blood pressure after exercise, resulting in headache and nausea due to increased intracranial pressure. If the blood pressure is very high, you can take oral antihypertensive drugs for treatment, and if necessary, you can give dehydrating agents such as mannitol for treatment. 3, whether the patient has hypoglycemia, because the exercise body will consume a lot of energy, when the energy intake is insufficient, there will be symptoms of hypoglycemia, manifested as headache and nausea.