Monthly back pain may be due to lumbar muscle strain, fetal compression to the lumbar spine, lumbar muscle laxity and other factors, can be relieved by appropriate rest, massage and hot compresses, wearing a waist girdle fixed. 1. Lumbar muscle strain: As the whole body needs to use its muscles to labor, it may cause lumbar pain by straining the whole body and lumbar muscles. The symptoms of back pain can be relieved by proper bed rest and avoiding prolonged standing or bending. 2. Fetal compression to the lumbar spine: As the fetus grows during pregnancy, it is easy to compress the lumbar spine, resulting in lumbar muscle damage, and the symptoms of lumbar pain during the menstrual period can occur, during this period, you can promote blood circulation in the lumbar muscle through appropriate massage, hot compresses, to alleviate the pain in the lumbar region. 3. lumbar muscle relaxation: due to women during pregnancy abdomen is large, may lead to lumbar vertebrae part of the ligaments after the elasticity of the lumbar spine after the support of the lumbar support weakened, after sitting in the month of pregnancy will cause the symptoms of lumbar pain. Sitting in the month of maternity can be fixed by wearing a waist girdle, can reduce the lumbar intervertebral disc, ligament pressure, effective protection of the lumbar spine, relieve the symptoms of lumbar pain. If the symptoms of lumbar pain during menstruation are more intense, you should go to the hospital in time for relevant examination and treatment under the guidance of professional doctors.