Pregnant sleep buttocks side pain is mostly caused by the following four reasons: First, when sleeping for a long time to maintain a position not move, buttocks side muscle pressure ischemia, fatigue caused; Second, calcium deficiency caused by pregnant women osteoporosis, softening, decalcification; Third, the uterus is gradually increasing, the local tissues of ligamentous laxity, compression of pelvic nerves, blood vessels caused by the buttocks side pain; Fourth, the pubic symphysis separation of the patient also has buttocks side pain Performance. Pregnant women can local massage and should be more sunshine, pay attention to supplemental nutrition and calcium, but also can take vitamin D and calcium tablets. Usually do more soothing exercise, maintain weight, not sedentary and long standing, do not keep a position too long, do not bend over to lift heavy objects, keep a happy mood. If self-treatment can not be relieved, it is recommended that the hospital consultation.