Pain in the bone behind the buttocks may be related to trauma, neuropathy, inflammatory lesions, tumor and other reasons. 1. Trauma: the patient’s buttocks may be injured by impact or fall, which may damage the sacrococcygeal ligament, or even lead to coccygeal bone fracture or dislocation, resulting in severe pain in the coccygeal area. 2. Neuropathy: It is mostly seen in lumbar spine diseases that cause continuous nerve compression, resulting in continuous radiating pain in the tailbone. Such as lumbar disc herniation, in addition to pain in the tailbone, it will be accompanied by lumbar pain, lower limb pain and other symptoms. 3. Inflammatory lesions: Inflammation of ligaments and fascia in the tailbone, osteoarthritis of the sacrococcygeal joints, sacral neuritis, and inflammation of the reproductive system can stimulate the caudal nerves and cause pain in the tailbone. 4. Tumor: rare such as chondrosarcoma, chondrosarcoma, etc., which can compress the peripheral nerves and blood vessels of the tailbone and cause pain. There may be other clinical reasons that can lead to pain in the bones behind the buttocks. It is recommended to go to the orthopedic department of the hospital as soon as possible in order to clarify the cause of the disease.