Pain in the upper knee can be caused by the following: first, bursitis of the suprapatellar bursa, which can have pain in the bursa above the knee, and can be accompanied by swelling and joint cavity effusion, which should be diagnosed and treated early by early examination of the knee joint with ultrasound and MRI. Second, quadriceps tendonitis, quadriceps tendonitis is often due to long-term sports for young people, or long-distance walking of the knee joint, chronic injury, resulting in damage to the quadriceps tendon, resulting in pain above the knee, which should be investigated and diagnosed by early MRI of the knee joint. Third, osteoarthritis of the knee joint, osteoarthritis of the knee joint can have the formation of bone spurs above the patella, which can lead to pain above the knee as well as limited knee joint movement, joint deformity, and bone superfluous formation, which should be examined by X-ray and CT of the knee joint for diagnosis and treatment.