Tailbone pain alert primary tailbone pain, bone tumors, traumatic lesions caused by soft tissue or fractures, etc., pregnant women, consider the possibility of fetal compression. 1. Primary tailbone pain: mostly related to the strain caused by sedentary activities, the excessive stress on the sacrococcygeal area leads to local aseptic inflammatory reaction causing pain in the tailbone, generally the pain can be relieved or even disappeared after resting, and the local pain will be aggravated by the stress. x-ray film usually has no obvious abnormality. 2. Bone tumor: such as malignant tumor of sacrum, its pain is usually persistent, night pain is obvious, sometimes there is a local raised soft tissue mass, which can be clearly diagnosed by MRI. 3. Traumatic lesions: mainly tailbone fracture and local soft tissue contusion, etc. Generally, there are traumatic injuries, such as collision or bruises. In addition, if the patient is a pregnant woman, she should also consider the extrusion of the fetus on the sacrococcygeal region; if she has given birth to a woman, it may be caused by the laxity of local ligaments. In conclusion, it is recommended that the patient consult an orthopedic surgeon for further clarification of the cause of the problem.