Pain inside the buttocks can be divided into buttock muscle pain, bone pain, intestinal pain of three types.1, muscle pain. Considered due to too much hip activity or long-term sedentary caused by, although the buttock muscle volume is large, more soft, but if long-term compression, easy to cause poor blood flow, induced local edema, aseptic inflammation, resulting in more pronounced pain.2, bone pain. Sitting for a long time causes the femoral head joint to interact with the hard surface of the table and chair, producing pain. The clinical possibility of synovitis of the bony nodes also exists.3. Pain in the intestinal tract. Consider the intestinal lining with abnormal growths, internal hemorrhoids, tumors, nodules, lumps can induce pain inside the buttocks.