If a patient has sudden leg numbness, the causes triggered include prolonged squatting activities, acute attack of lumbar disc herniation, diseases of cranial parts, etc., as follows: a. prolonged squatting activities: after the patient gets up, it is easy to cause sudden leg numbness. Second, the acute attack of lumbar disc herniation: patients with acute attack of lumbar disc herniation, also prone to sudden leg numbness symptoms. Third, the cranial parts of the disease: such as cerebral hemorrhage, cerebral infarction, also easy to trigger the patient sudden leg numbness symptoms. Therefore, after the patient has sudden leg numbness, must be consulted to see what causes, to promote the cause of treatment to reduce leg numbness symptoms, recovery. After the sudden leg numbness occurs, it is important to rest in bed and avoid forceful activities of the legs to avoid aggravation of the symptoms. After the symptoms appear, you can temporarily apply blood circulation drugs, together with neurotrophic drug therapy to relieve leg numbness symptoms.