Pregnant women always have pain in the buttocks: 1, it may be because in late pregnancy, the pelvic floor muscles are weak, the pressure of the enlarged uterus on the large blood vessels inside the pelvis will be more obvious, causing blood vessel congestion, tissue and hypoxia around the pelvic region and lumbar vertebrae, so some pregnant women will have the symptoms of buttocks pain. 2, it may also be because the placenta secretes relaxin during pregnancy, relaxin makes the joints of the lumbosacral vertebrae and the ligaments of the pelvis In a relatively relaxed state, the enlarged uterus causes the pelvis to tilt forward, plus the ligaments are relaxed, which will make the lumbosacral region bear huge tension, and in serious cases, the disc will protrude, and the protruding disc will compress the nerves and cause inflammatory reactions in the surrounding tissues, and buttock pain will occur. Therefore, during pregnancy, if you can do some physical exercise appropriately according to your actual situation and maintain the correct posture, you may effectively reduce the occurrence of these symptoms.