Pain around the knee can be caused by a knee sprain, or by conditions such as knee osteoarthritis and gouty arthritis. 1. Knee sprain: the occurrence of this disease is related to trauma, which includes high-energy violence factors such as skating, skiing, wrestling, and low-energy violence factors such as slipping and stepping on empty stairs. In the acute stage, it is often characterized by pain, swelling and limitation of movement around the knee. 2. Knee osteoarthritis: the etiology of the disease is still unclear, and it is currently believed that it may be related to aging, obesity, pathogenic microbial infections, trauma, genetics and other reasons. Typical symptoms include knee pain, joint deformity, tumor and bone friction. 3. Gouty arthritis: research shows that this disease may be related to genetic and purine metabolism abnormalities, hyperuricemia and other reasons, common triggering factors are joint injuries, large amounts of alcohol, high-purine diet, etc., the common parts of the affected areas are the knee joints, ankle joints, etc., which can be manifested as pain around the knee, swelling, elevated skin temperature and so on. If you have pain around the knee, you need to go to the hospital in time to do a series of relevant examinations to clarify the cause of the disease and standardize the treatment.