The phenomenon of tailbone pain and pain when sitting is usually due to local trauma, strain and other factors, but also seen in the nerve compression, local inflammation, tumors and other diseases, if the symptoms continue to not relieve, or pain is more serious, it is recommended to seek medical treatment in a timely manner to avoid delaying the disease. Clinically, it is mainly caused by the following causes: 1. Trauma: violent kicks, falls, high falls, etc. can lead to contusions, fractures or dislocations of the tailbone, triggering pain and aggravation when sitting down. In addition, women in childbirth due to obstructed labor can also lead to injury to the sacrococcygeal joint, resulting in tailbone pain, assisted delivery with forceps or breech delivery can also cause injury to the baby’s sacrococcygeal area, leaving behind the symptoms of tailbone pain; 2, strain: sedentary, long-term poor sitting posture, etc. can lead to chronic injury to the muscles of the tailbone area, which can appear or induce tailbone pain when sitting down; 3, compression: such as pregnancy, lumbar disc herniation, lumbar spine slippage, etc. When the nerve roots are compressed, it can lead to pain in the tailbone, and the pain can be aggravated when sitting down; 4, inflammation: inflammation of the ligaments and fascia around the tailbone, degenerative arthritis of the sacrococcygeal joint, and sacral neuritis, arachnoiditis of the lower sacral nerve roots, etc., may lead to tailbone pain, and the symptoms may be aggravated when sitting down. In addition, infection in the pelvic area, involving the pelvic floor muscles, may lead to muscle inflammation or spasm, which may also cause tailbone pain; 5, tumors: tumors near the tailbone, such as chordoma, chondrosarcoma, chondrosarcoma, hemangioblastoma and paracolumbar lipoma, etc., due to tumor invasion of periosteum and bone, can cause tailbone pain, and may also aggravate the symptoms when sitting down. In addition, if the patient has congenital malformation of the tailbone, it may also cause tailbone sitting pain.