There are two main causes of bone pain behind the buttocks in women: First, pain in the sciatic nodes. There are muscle attachments and bursae around the sciatic nodes, so if there is a relatively large strenuous activity and sitting for a long time, local cold, it will easily lead to muscle strain or inflammatory lesions, and the bursae will also appear bursitis, which will stimulate the peripheral nerves around the pain, which feels like bone pain. Second, damage to the tailbone on the back side of the buttocks or strain on the surrounding muscle attachment points and inflammation of the tailbone fascia may produce stimulation of the peripheral nerves around the area, which can cause significant pain. In the sitting position, as the position of the tailbone continues to be strained and stimulated, it will lead to an increase in pain, usually bed rest to avoid extrusion of this position, the symptoms can be significantly relieved.