There are many reasons for knee pain due to exercise, the most important of which is the friction between the joint and joint surface caused by exercise, and the reduction of joint fluid in the joint cavity, both of which can lead to knee pain. The anatomy of this part of the knee is complex, including the bottom of the femur, the top of the tibial plateau, the patella attached in front, and then the top of the femur and tibia, covered by the meniscus in the middle, which has no blood vessels or nerves, but excessive exercise can cause wear and tear on the meniscus. Meniscus damage is irreversible, so it can cause a lot of damage to the body. Therefore, in the process of sports, it is important to avoid accidents caused by excessive wear and tear on the joints, resulting in damage to the meniscus, as well as excessive friction between the joints, to be examined in a timely manner, to take X-rays or to clarify the cause of knee pain, and then to assist in treatment.