Pain above the kneecap may be due to joint effusion, bursitis, tendonitis and other conditions. 1. Joint effusion: usually due to joint trauma, infectious arthritis, psoriatic arthritis, gout and other conditions. Patients often appear joint swelling, pain, activity disorder and other symptoms, some patients can also appear above the kneecap pain phenomenon. When there is obvious infection and inflammation in the joints, redness and warmth of the skin can also occur. 2. Bursitis: usually considered to be due to trauma, infection, joint disease and other conditions, and also related to occupation, age and other factors. Patients often have localized swelling, stiffness or pain around the joints, as well as pain above the kneecap. Some patients may also suffer from redness, swelling and heat around the joints. 3. Tendonitis: It is usually caused by overuse of muscles and tendons, repeated strong pulling, etc., and it is also considered to be related to factors such as occupation and sports. Patients often experience dull pain and tenderness at the lesion site, which may be aggravated by pulling on the affected area. Some patients may also experience pain above the kneecap, accompanied by stiffness and numbness of the joint. In addition to the above factors, rheumatoid arthritis, osteoarthritis and other diseases are also considered. It is recommended that patients clarify the cause of the disease and then carry out targeted treatment under the guidance of the doctor.