Symptoms of bursitis of the caudal spine: 1. The acute phase is characterized by pain, limited pressure and restricted activity, often accompanied by localized redness and swelling if the bursal inflammation is superficial. 2. Chemical or bacterial bursitis are associated with severe pain, with episodes lasting from several days to several weeks, and many times, easily recurring. 3. Chronic synovitis of the caudal spine is mainly due to multiple episodes of acute bursitis, or repeated trauma The development of synovitis is caused by repeated attacks of acute bursitis or repeated trauma. Because of the hyperplasia of the synovial membrane and the thickening of the bursal wall, adhesions of the bursa eventually occur, resulting in pain, swelling and tenderness that can lead to restricted movement and muscle atrophy of the sacrococcygeal region. The most common type of bursitis is caudal injury bursitis, which occurs slowly, often in the caudal region where the bone structure is prominent, and is caused by long-term repetitive friction and compression, often on the basis of chronic bursitis, and when the force of the injury is high, it can be accompanied by bloody synovial fluid exudation from the caudal region.