Sudden dizziness and general weakness may be caused by insufficient blood supply to the brain, which can cause ischemia and hypoxia in the brain and also in the cerebellum and brainstem. In cerebral ischemia and hypoxia, patients may experience sensory impairment and motor impairment in the lateral limbs and may also experience general weakness; in cerebral ischemia and hypoxia in the cerebellar brainstem, patients mainly present with dizziness, nausea, vomiting, balance disorders and ataxia. Insufficient cerebral blood supply may be caused by low perfusion in the brain, hypotension, or atherosclerosis. Patients with hypotension are prone to cerebral hypoperfusion, which may lead to inadequate cerebral blood supply in patients. Hypotension is seen in people with weak constitution, and may also be caused by improper use of blood pressure lowering drugs in patients with hypertension. If the patient has lower blood pressure should be given oral pulse drink, oral sugar saline, if necessary, intravenous infusion treatment, generally given intravenous infusion of drugs to expand the volume, such as 706 plasma substitute. If the patient is caused by atherosclerosis, the cause of atherosclerosis should be further analyzed, and common causes include hyperlipidemia and diabetes. Hyperlipidemia is mainly treated with lipid-regulating therapy, which can be given orally with simvastatin, resulvastatin and atorvastatin. Patients with diabetes mellitus are mainly treated with oral hypoglycemic drugs, metformin is preferred, and if necessary, byproterenol and repaglinide can also be added at the same time.