Left leg pain is usually caused by osteoarthritis of the leg, fasciitis, vascular disease of the lower limbs, lumbar spine disease and strenuous exercise, etc. For different causes, physical therapy, medication and surgery should be taken. 1. Osteoarthritis: osteoarthritis of the left lower limb because of cartilage damage can stimulate the subchondral bone and synovial tissue causing symptoms of soreness in the left leg. Appropriate plasters and physical therapy. 2. Fasciitis: Fasciitis caused by cold and strain injury, because of the aseptic inflammation of the fascia can cause symptoms of left leg pain. Attention should be paid to keep warm, and localized hot compresses should be applied at the same time. 3. Lower extremity vascular diseases: problems caused by veins or arteries, such as varicose veins in the lower extremity, or intermuscular venous thrombosis in the lower extremity, and poor circulation caused by arterial occlusion, can also affect the calf soreness and pain. 4. Lumbar spine disease: due to lumbar disc herniation, or lumbar spinal stenosis, caused by the left lower extremity radiating pain, or numbness, usually with the lumbar spine has a clear relationship between the oral nutritional nerve drugs. 5. Strenuous exercise: running, playing soccer and other strenuous exercise, may lead to excessive lower limb movement, so that the leg lactic acid accumulation, which will appear in the phenomenon of left leg pain. There are many causes of left leg pain including rheumatoid and rheumatoid arthritis and tumors of the bone and muscle tissues of the left leg, etc. It is recommended that patients seek medical treatment in time to clarify the cause of the disease and standardize the treatment.