If a patient experiences dizziness accompanied by nausea every afternoon, the following causes should be considered: First, the patient is considered to have cerebrovascular disease, such as transient ischemic attack, or acute cerebrovascular insufficiency of blood supply, chronic capillary infarction, lacunar cerebral infarction, all of which can trigger dizziness, headache and nausea. Secondly, in the afternoon every day, the human body will cause sympathetic nerve overexcitation, and when there are different degrees of increased tension in the sympathetic nerve department, it will trigger a rise in blood pressure. After the rise in blood pressure, usually the patient will also have an increase in intracranial pressure, so there will be clinical symptoms and reactions of dizziness, headache, nausea, and jet-like vomiting. Thirdly, when the endocrine regulatory system is malfunctioning, especially in the thyroid gland, patients will also experience dizziness, headache, nausea, and peripheral weakness in the afternoon.