Soreness in the lower back may be due to the following reasons. The first condition is due to poor posture in daily life, such as sitting or standing, which leads to continuous stretching of the lumbar muscles, and over time, strain occurs and leads to soreness and pain. In the second case, if a woman has a sore back, it may be due to an abnormal position of the uterus, or pelvic inflammatory disease, pelvic tumors, and stimulation of the ring, which may cause the soreness of the back. In the third case, it may be due to lumbar disc herniation, lumbar muscle strain, and kidney diseases such as glomerulonephritis. Patients in this situation should go to the hospital in time to find out what causes it and then give targeted treatment.