There are many aspects that cause patients to experience sudden dizziness, and the main considerations are the following: First, if the elderly have cerebral arteriosclerosis and cerebral vascular stenosis, they are prone to episodes of dizziness. The second aspect is hypertension. If the patient has high blood pressure and also takes antihypertensive drugs irregularly, the blood pressure is not well controlled and the symptoms of sudden dizziness may occur. The third aspect, the reaction of hypoglycemia, if the patient is diabetic, the application of hypoglycemic drugs insulin dose is too large, or irregular diet situation caused by hypoglycemia, will also suddenly dizziness, but the patient will be accompanied by panic, hand trembling, sweating symptoms. The fourth aspect to consider is that it is caused by otolithiasis, which is caused by the irritation of the cell membrane of the semicircular canal by the dislodged otolith particles.