The most common diseases that cause knee pain are osteophytes, patellar chondromalacia, infrapatellar fat pad injury, meniscal injury, synovitis and other diseases, which can develop alone or at the same time. In the early stage of knee pain, soft tissue injury around the knee joint is usually the main cause, and in the late stage, osteophytes can be manifested. 1, knee osteophytes: also known as osteoarthritis, bone degeneration, mostly seen in the elderly. 2, chondromalacia patella: patellar cartilage surface and its relative femur about cartilage degenerative changes, mainly in the front of the knee pain, joint soreness and weakness, up and down the stairs feel discomfort pain, mostly related to weather changes, often feel cold joints, Chinese medicine believes that the external causes of the disease is joint strain, damage to the tendons, as well as feel wind, cold and dampness caused by the internal causes are mainly liver and kidney deficiency, blood does not nourish the tendons caused. 3, infrapatellar fat pad injury: the prominent feature of this disease is pain under the bone or deep pain, aggravated by activity, alleviated after rest, especially the knee joint straightening pain is the heaviest, bending relief in the two knee eyes with pressure pain swelling. 4, synovitis: synovitis it is mainly distributed around the joint, in the joint cavity, secrete lubricating fluid, lubricating the joint, in the various trauma, fracture, excessive strain, intra-articular free body and surgery, etc. stimulation or injury to the synovial membrane and inflammatory reflection, once the onset, the knee joint congestion and swelling, increased exudation, joint effusion. Patients mainly feel painful swelling of the knee and have difficulty in moving and squatting.