Buttock pain in sitting stool, mainly consider three reasons: 1, gluteus maximus muscle injury, such as strenuous exercise caused by gluteus maximus muscle strain, long-term activities leading to strain on the gluteus maximus muscle, may form aseptic inflammatory foci, inflammatory exudate in the sitting position will produce stimulation of the surrounding nerves, there is obvious pain. 2, pyriformis muscle injury, such as carrying heavy loads to walk, will lead to pyriformis muscle continuous tension, strain, in the sitting position, the pyriformis muscle is squeezed, there will be obvious pain. In the sitting position, the pyriformis muscle is squeezed, and obvious pain will occur. 3, common sciatic bursitis, in the position of the sciatic bone, there is a fat cushion called the bursa, in the case of frequent sitting, the bursa continues to be stimulated, blood circulation is slowed down, and inflammatory metabolites accumulate, which will stimulate the peripheral nerves around the peripheral nerves, and obvious pain will occur. The bursa is a fat pad called the bursa.