The patient has a headache and vomiting. 1. First, the cause of the headache should be identified, which may be caused by high blood pressure, and it is recommended to measure the blood pressure. 2. 4. Consider that the patient may have acute gastroenteritis, which can also manifest as headache and vomiting when the patient has eaten suspicious deteriorated food. At this time, it is recommended that the patient can drink more warm water and then eat lightly.