Knee soreness and swelling are mainly considered for the following reasons: 1. Synovitis, which is the most common clinical and winter disease, is caused after cold or cold, and after local cold and wind, the blood supply to the synovial membrane is reduced due to vasoconstriction, resulting in the ineffective removal of metabolic waste, causing sterile inflammation, resulting in knee soreness and swelling, and discomfort, which is treated by rest, hot compresses, and oral meloxicam. 2. Osteochondritis of the knee joint, due to excessive activity or chronic degeneration caused by cartilage wear, causing fluid accumulation in the knee cavity can also cause soreness and swelling, through rest, as well as oral cartilage nutrient drugs, such as glucosamine sulfate, 1-2 months to recover. MRI can also be done directly to clarify the diagnosis and further determine the treatment plan based on the cause.