The pain below the knee may be tibial tuberosity epiphysitis, patellar tendonitis, meniscus injury and so on. 1. Tibial tuberosity epiphysitis: the epiphysis of the tibial tuberosity is repeatedly stretched and damaged, resulting in aseptic inflammation, this disease is common in children and adolescents, generally do not need treatment, prohibit running and jumping activities. You can also take oral ibuprofen, celecoxib and other medications as prescribed by your doctor to relieve pain. For the more serious can be utilized long leg tube type plaster or support fixed treatment, conservative treatment has no obvious effect, can be treated by surgery, such as bone nail placement. 2. Patellar tendonitis: patellar tendon is the tendon connecting the patella and tibia, below the knee, if you often do some jumping sports, such as basketball, jumping rope, this situation may lead to the patellar tendon is damaged, causing pain below the knee. You should take more rest, and usually use red light baking electricity, drug introduction heat therapy instrument and other methods for treatment. 3. Meniscus injury: long-term sports or heavy physical activities will lead to chronic meniscus injury, knee pain, swelling, joint popping and other symptoms. It can be treated by surgery, such as meniscus suture, meniscoplasty and so on. The pain below the knee should seek medical treatment as soon as possible to identify the cause and then standardize the treatment, do not use drugs indiscriminately.