Caudal vertebrae soreness and swelling occurs for the following common reasons: First, prolonged sitting position: If the patient has a thin body type, continuous sitting position will cause continuous local pressure on the caudal vertebrae, causing local blood circulation disorders, and the patient will have soreness and swelling. Second, caudal vertebrae trauma: such as fracture dislocation, local blood circulation will also be impaired during the recovery period, so it will be manifested as the clinical symptoms of caudal vertebrae soreness, swelling and pain. Third, lumbar disc herniation: when stimulating the nerve roots, it can induce soreness and pain in the caudal vertebrae, which is more obvious in the early stage. Early diagnosis and early treatment can result in significant relief of the clinical symptoms of soreness and swelling of the caudal vertebrae. If treatment is delayed, it will affect the patient’s normal sitting work and he cannot participate in strenuous sports for a long time.