The soreness of women from the waist to the buttocks may be caused by the following reasons: 1. due to lumbar muscle strain, seen in women who need to sit and stand for a long time, or repeatedly bend over to pick up things, which can lead to fatigue damage to the muscles of the waist. 2. due to overexertion, seen in women who have been overexercising their waist for a long time, such as women who work out or do yoga. If the patient is standing for a long time, it is also possible that the fatigue of the lumbar muscles may cause soreness and swelling. 3, caused by cold in the lumbar area, such as inadequate clothing, blowing in the cold wind or contact with cold objects causes muscle spasm. 4, caused by poor posture, such as the habit of sitting and standing with legs crossed or hunching over, causing muscle spasm, which then leads to the above symptoms.