Left arm and leg numbness: 1. Consider that it is caused by brain disease. If the patient is a sudden onset of left arm and leg numbness can be seen in cerebrovascular disease. Clinically, it can be seen in cerebral infarction, cerebral hemorrhage or transient ischemic attack, and the diagnosis can be confirmed by head CT and transcranial Doppler examination. Treatment should be directed at the cause of cerebral infarction, cerebral hemorrhage and transient ischemic attack, and symptomatic treatment such as antiplatelet aggregation or dehydration and lowering of cranial pressure should be given accordingly. After the acute treatment, the patient’s symptoms can be significantly relieved, and the patient can also be given with acupuncture and massage to relieve them.2. Left arm numbness and leg numbness, if the patient is gradually appearing symptoms, can also be clinically seen in intracranial occupying lesions, which can be seen in the right cerebral hemisphere. The patient can also be accompanied by headache, in severe cases, vomiting, treatment is mainly to remove the occupancy. 3, the left arm, leg numbness can also be seen in cervical spondylosis, lumbar spondylosis, the patient also exists cervical spondylosis, lumbar spondylosis, consider osteoporosis is more serious, treatment is mainly to nerve nutrition, physiotherapy.