Mild synovitis can heal on its own. Synovitis is the accumulation of fluid and blood in the synovial joints. In clinical practice, the symptoms of osteoarthritis are directly proportional to the degree of synovitis. Mild synovitis of the knee can be fully recovered with proper rest, a small amount of medication, and attention to cold and warmth. However, it is important to maintain exercise during the rest process. Functional exercise plays a large role in the treatment of mild synovitis, and many mild synovitis diseases can be cured without medication by exercising the muscles. Therefore, there is no need to be nervous about mild synovitis and seek professional diagnosis. Because synovitis symptoms can occur in many diseases, synovitis is not a disease, it is a symptom. Diseases such as bone tumors, bone tuberculosis, rheumatism, rheumatoid, and gout can all cause synovitis. Therefore, synovitis treatment should first be diagnosed clearly. According to the diagnosis, the treatment is symptomatic.