At 36 weeks of pregnancy, experiencing lower back pain is a relatively common symptom. As the uterus expands during pregnancy, the spine undergoes physiological curvature changes, altering the body's center of gravity. The increased strain on the muscles and ligaments in the lower back leads to fatigue and discomfort. Additionally, in the later stages of pregnancy, the increased levels of the hormone relaxin cause muscles and ligaments to stretch more easily during movement, exacerbating the lower back pain. The direct pressure of the uterus on the pelvic region can also strain the pelvic nerve plexus, directly contributing to the discomfort. It is recommended that pregnant women focus on getting more rest and sleep in a side-lying, flexed position. Local massage and warm compresses can also help alleviate the symptoms.