Back pain in pregnant women may be caused by calcium deficiency, or by physiological factors, as well as spinal and muscular diseases, reproductive organ diseases, urinary system diseases, etc. It is recommended to consult a doctor to clarify the cause. 1. Calcium deficiency: during pregnancy, especially in the middle and late stages of pregnancy, due to the increased nutritional requirements of the fetus, the pregnant woman’s supply of calcium is insufficient, you can appear back and leg pain, leg cramps and other symptoms, usually supplemented with sufficient calcium can relieve the symptoms. 2. Physiological factors: after pregnancy, as the abdomen grows, it can increase the load on the waist, thus leading to back pain. 3. Spinal and muscular diseases: such as lumbar muscle strain, ankylosing spondylitis, intervertebral disc herniation, lumbar fracture, etc., can cause lumbar pain, and pregnant women can also be accompanied by obvious pressure pain at the lesion site. 4. Diseases of reproductive organs: such as cervicitis, salpingitis, pelvic peritonitis, etc., some pregnant patients can also be complicated by low back pain. 5. Urological diseases: such as kidney stones, pyelonephritis, etc., the patient in addition to lumbar pain, can also be accompanied by hematuria, urinary frequency, urinary urgency, urinary pain and other symptoms. Pregnant women with symptoms of lumbago, persistent unrelieved or accompanied by other discomforts, should consult a doctor in a timely manner, under the guidance of a doctor to identify the cause of the disease, and comply with the doctor’s instructions for the appropriate treatment, to avoid blind judgment on their own, in order to avoid the impact of delayed condition.