In clinical practice, if men develop numbness in the left leg, it is a relatively common symptom. Most of them are caused by the patient’s left leg overexertion, cold, strain and other causes of muscle soft tissue damage in the left leg, resulting in poor local blood circulation, feeling numbness and muscle weakness in the left leg. If this is the case, the patient should be asked to rest in bed and avoid getting cold in the leg, and at the same time, the patient can be treated with Chinese medicine massage and physiotherapy instrument baking electricity. Another condition is leg numbness due to problems in the lumbar spine, such as lumbar disc herniation, which often results in numbness in the left leg. In addition to numbness in the left leg, the patient will also feel pain in the lumbar area, positive pressure pain, the patient cannot bend over, and muscle weakness in the left lower limb. If this is the case, an X-ray or CT film of the lumbar spine should be taken at the hospital, which can clearly diagnose whether there is a lumbar disc herniation. If there is a lumbar disc herniation, the correct symptomatic treatment should be taken for the lumbar disc herniation.