Pregnant women who flashed their backs, if it is not serious generally have no obvious effect on the fetus. But if it is more serious flash to the waist, may affect the fetus, need to go to the hospital gynecology department in time to do routine obstetric examination. If the examination is normal, and there is no obvious abdominal pain or abnormal vaginal discharge, it is usually not a big problem. For minor flash to the waist, mainly local muscles, ligaments and other soft tissue injuries. Treatment is mainly bed rest, rest, local can be hot packs physiotherapy, try to avoid drugs, because drugs may have an impact on the development of the fetus. If the pain in the lumbar area is very obvious, especially affecting normal standing or walking, we should pay attention to the possibility of lumbar vertebrae fracture, we need to go to the hospital to find orthopedic surgeon interview, combined with the examination of the initial judgment.