The human spine can be divided into cervical, thoracic, lumbar, sacral, and caudal vertebrae in that order. The caudal vertebrae are located below the sacrum and are made up of three to five degenerated vertebrae combined to form the caudal end of the spine. From the anatomical structure, our caudal vertebrae are less fatty and less “fleshy” than the hip, so when we fall, the pain of periosteal injury is unbearable, and in case the soft tissue under the periosteum bleeds, coupled with poor recovery, it will easily become Chronic fibrous tissue inflammation leads to pain in the tailbone area. Therefore, most of the pain in the tailbone area comes from poor posture. If you keep sitting upright or slightly leaning forward, the tailbone is subjected to little force, but if you sit and lean back, the tailbone is subjected to a lot of force, and part of the body weight is transmitted downward through the tailbone, so over time, the tailbone area will become painful. Secondly, trauma leads to different degrees of oozing, edema, mechanization, degeneration, spasm and other changes in the soft tissues around the tailbone and causes pain; more serious is a fracture of the tailbone, which makes the tailbone bend forward and become larger and causes pain; therefore, it is better to explain the cause of pain in the tailbone area if it has been injured. Tailbone soreness is also related to the lumbar spine. Degenerative changes and acute and chronic injuries to the lumbar spine can also cause tail pain; they can also cause changes in the physiological curvature of the tailbone leading to instability or deformation of the tailbone, resulting in soreness and discomfort and pain of the tailbone. Finally, if long-term chronic pain, especially when the pain is more intense or accompanied by nocturnal pain, be careful of sacrococcygeal area tumor. Therefore, if the short-term, mild tailbone pain, through symptomatic treatment quickly improve, generally not a big problem, but if long-term chronic or short-term severe tailbone pain, need to consider whether there are other serious problems, need to go to the hospital for further examination to clarify the cause.