Knee pain after jumping rope may be a normal phenomenon, but also may be caused by acute injury. 1. Normal phenomenon: a long time no exercise, lack of physical exercise, jumping rope when the amount of exercise is too large, after jumping rope may appear reactive pain, manifested as soreness, the symptoms are not serious, after a reasonable rest can be improved. 2. Acute injury: when jumping rope, the time is longer, and the amount of exercise is too large, may lead to knee cartilage, ligaments, meniscus and other parts of the knee joint damage, will cause knee pain, may also be accompanied by swelling, restricted movement and other symptoms. After jumping rope knee pain symptoms are more serious, should also seek medical examination, clear specific causes, timely treatment, to avoid causing other complications.