Exercise-induced synovitis is a disorder of the synovial membrane’s ability to secrete and absorb fluid due to irritation of the synovial membrane from excessive exercise. Synovitis is a multifactorial disease that can be caused by degeneration of articular cartilage, injury, chemical irritation and infection. It causes the patient to develop symptoms such as joint edema, pain, and limited movement, and a reactive synovial effusion for a period of time after the injury. If not treated in time, synovial hypertrophy, intra-articular adhesions and cartilage degeneration can occur. After prolonged repetition of a single movement of the joint and excessive exercise, synovial tissue can be caused by congestion and edema, red and white blood cells and fibrin exudation, increased intra-articular pressure and decreased oxygen partial pressure. When the rate of exudation exceeds the rate of synovial membrane absorption, fluid accumulation occurs in the joints, leading to a further increase in intra-articular pressure and a decrease in partial pressure of oxygen, and in the long run, symptoms such as synovial degeneration and lipofuscinosis occur. If synovial inflammation occurs after exercise, it is necessary to receive regular treatment in time to avoid the later transformation into chronic inflammation, synovial hypertrophy, intra-articular adhesion and so on.