Sudden dizziness can be caused by cerebrovascular diseases, mainly vascular lesions of the posterior circulation, and dizziness caused by vascular lesions of the posterior circulation, which can be accompanied by rotation of vision and oblique walking, numbness and weakness of the limbs, etc. 2. The patient has a protruding cervical disc, which affects the blood supply of the vertebral artery when turning the head, and the patient may experience sudden dizziness. 3. If the patient has panic attacks and sweating, the patient should also be alert to the occurrence of hypoglycemia, as the patient has a history of diabetes, due to untimely eating or insulin overdose, etc. 4. Therefore, for sudden dizziness, it depends on the accompanying symptoms of the patient.