The main reasons for back pain after pregnancy are as follows: 1. The secretion of estrogen and progesterone in the body after pregnancy will stimulate the body, resulting in back pain. 2. 4.It may also be caused by diseases, such as lumbar disc protrusion, lumbar spondylosis, lumbar muscle strain and other problems can cause back pain symptoms, it is recommended to treat according to the actual situation. If it is a normal body reaction, you can not worry, usually you can pay more attention to rest, appropriate activities, can effectively relieve the symptoms of lumbago.