If the patient suddenly becomes dizzy without other symptoms, the following causes should be considered: 1. If the patient becomes dizzy under the condition of overuse of the brain and exertion, the main manifestation of dizziness is dizziness, which is mainly related to the neurological disorder of the brain. 2. If the patient suddenly becomes dizzy without other symptoms, it should also be considered related to blood pressure. If the patient has severe cerebral vascular stenosis or cerebral atherosclerosis that causes chronic cerebral insufficiency, then the patient may be triggered to have a sudden dizziness due to exertion or poor rest. 4. The patient’s sudden dizziness may also be caused by transient cerebral ischemic attack.