The swelling and pain on both sides of the waist of women may be related to lumbar muscle strain, menstruation, myofasciitis of the lumbar back and other reasons. 1. Lumbar muscle strain: In the course of work, poor sitting posture, stilted legs, long-term bending, etc. lead to lumbar muscle overstretching, resulting in lumbar muscle strain, resulting in pain on both sides of the lumbar muscle. 2. Menstruation: If a woman is in the physiological period of menstruation, it may lead to congestion of the pelvic tissues due to the change of hormone levels in the body. Women will experience bloating and pain on both sides of the lower back. 3. Myofasciitis of the low back: due to mental stress, cold, dampness, chronic strain, etc., the myofascia and muscle tissues of the low back become edematous and fibrotic, resulting in low back pain on both sides. Women who experience swelling and pain on both sides of the waist are advised to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.