Gymnastics knee pain is usually caused by pathological factors, such as meniscus injury, degenerative knee osteoarthritis, chondromalacia patellae and so on. 1. Meniscus injury: if the intensity of exercise is too large or improper exercise, it may lead to meniscus injury of the knee joint. When jumping exercise causes irritation to the meniscus, there is a possibility of knee pain, and in serious cases, there may be a sudden inability to move the joints and sudden weakness of the joints. 2. Degenerative knee arthritis: is due to strain, trauma, obesity and other reasons, so that the cartilage degeneration, subchondral bone plate reactive hyperplasia, resulting in the whole joint pain, stiffness. If there is too much activity when jumping exercise, frequent friction of the knee joint will aggravate the joint pain. 3. Chondromalacia patella: it is a disease that occurs due to progressive breakage of patellar cartilage and bone softening. Patellar degeneration, uneven joint surface will cause knee pain, swelling and other symptoms. When jumping exercises, if the patellofemoral joint pressure increases, it will cause knee pain. In addition to the above reasons, ligament injury, rheumatoid arthritis and other diseases can also lead to the performance of jumping knee pain. If the situation of jumping knee pain, it is difficult to relieve by themselves, it is recommended to consult a doctor in time, and follow the doctor’s instructions for the cause of the treatment.