Knee joint soreness may be caused by synovitis, chondritis, ligament soft tissue or meniscus injury, etc., and you should consult a doctor in time to find out the cause. 1. Synovitis: commonly seen after cold or flu, due to ischemia and hypoxia of the knee synovial membrane and aseptic inflammation, resulting in synovial edema, knee joint soreness and pain, which will be aggravated by blowing wind, and alleviated by hot compresses and rest. 2. Chondritis: common in young patients, due to a large number of sports, resulting in aseptic inflammation caused by metabolic product aggregation, showing edema, soreness of the knee joint, walking pain is obvious. 3. Ligament soft tissue or meniscus injury: local bleeding after knee injury, soft tissue repair edema, resulting in aseptic inflammation, which will lead to knee soreness and pain accompanied by activity limitation. It is recommended to go to the hospital as soon as possible for examination by the doctor to clarify the cause of the disease, and then give targeted treatment.