Knee pain after mountain climbing may be caused by excessive exercise, trauma or degenerative changes in the knee joint. 1. Excessive exercise: If the patient’s knee joints move too much when climbing mountains, it may lead to muscle and ligament strains or lactic acid buildup in the knee joints, thus resulting in knee pain after climbing mountains. 2. trauma: if the patient is accidentally hit by external forces while climbing, it may lead to damage to the soft tissues around the knee joint, which may lead to knee pain after climbing. 3. degenerative changes in the knee joint: if the patient has degenerative changes in the knee joint, it may induce synovitis in the knee joint when climbing mountains, which will lead to knee pain after climbing mountains. Patients who have knee pain for a long time after climbing mountains should go to the hospital for examination in time and be treated under the guidance of doctors according to the examination results.