Patients with pain below the patella when pressed are usually caused by several reasons: first, prepatellar bursitis, there is a bursa under the patella of the knee, when there is chronic aseptic inflammation there will be pain below the patella when pressed again, in severe cases there will be pain even without pressure, a lump can be seen, physical therapy is needed, in severe cases surgical removal may be required to cure. Second, prepatellar tendonitis, long-term sports patients often occur bone tendonitis, if too much exercise or a lot of long-term sports leading to chronic strain on the patellar tendon, will occur at the same time chronic inflammation leading to pain below the patella. Finally, chondromalacia of the tibial tuberosity is common in children, and exercise can lead to damage to the tibial tuberosity, which can lead to osteochondritis of the tibial tuberosity and pain under the patella of the knee.