Soreness in the lower back may be related to pathological causes such as lumbar diseases, urological diseases, gynecological diseases, etc., or physiological causes such as lactic acid accumulation. 1. Pathological reasons: soft tissue inflammation can be triggered by lumbar injuries such as lifting heavy objects, which can cause lumbar pain; pyelonephritis, renal tumors, urinary stones, etc., which can cause lumbar pain due to stimulation of inflammation, tumors, and stones; if a woman suffers from pelvic inflammatory disease, uterine adnexitis, etc., her back can be sore due to the stimulation of inflammation. 2. Physiological reasons: If a lot of physical training related to the waist is carried out, it may lead to the accumulation of lactic acid in the waist muscles, and waist pain may occur. It is recommended that people with low back pain go to regular hospitals in time to clarify the cause, and if treatment is needed, standardize the treatment under the guidance of the doctor.