Back pain can be caused by a variety of reasons, if the symptoms persist or worsen, you need to consult a doctor to identify the cause, the most common are the following points: first, myofibrositis, pregnancy is a normal physiological process, can cause a series of changes in the body endocrine, aseptic muscle inflammation, resulting in pain phenomenon, lumbar muscle is rich, very easy to appear lumbar pain, can be physical therapy, hot compresses to relieve Second, calcium deficiency can also cause lumbar pain, the fetus needs more calcium during development, and the pregnant woman consumes a lot, so most pregnant women will have calcium deficiency, resulting in lumbar pain, and need to take calcium supplements; third, kidney stones can also cause lumbar pain, and need to be diagnosed by ultrasound.