What causes lower back soreness and swelling in women after sexual intercourse?

Sexual intercourse usually refers to sexual activity. In general, lower back soreness and distension in women after sex may be caused by muscle fatigue, pelvic congestion, vaginitis, endometriosis, lumbar disc herniation, or other reasons. It is recommended to seek medical attention promptly and identify the underlying cause under the guidance of a qualified physician before initiating treatment. Specific analyses are as follows:

1. Muscle Fatigue

During sexual activity, increased engagement of the lower back muscles may lead to localized muscle fatigue and lactic acid buildup, resulting in post-coital lower back soreness and discomfort. Adequate rest and gentle muscle massage in daily life can help improve blood circulation and relieve symptoms.

2. Pelvic Congestion

During sexual activity, pelvic organs such as the uterus and ovaries become congested due to sexual arousal, and this congestion may radiate to the lower back, causing soreness and distension after intercourse. Maintaining healthy lifestyle habits and avoiding excessive physical strain can help alleviate back discomfort.

3. Vaginitis

Vaginitis, often caused by bacterial infection, may lead to lower back soreness after sex due to inflammatory irritation. Patients may also experience increased vaginal discharge and itching. Treatment under a doctor’s supervision may include medications such as Baofukang suppositories, Xiaomi suppositories, or Kangfu ointment.

4. Endometriosis

When endometrial glands and stroma invade the myometrium (uterine muscle layer), chronic pelvic pain may occur, leading to lower back soreness after sexual intercourse. This condition is typically accompanied by symptoms such as lower abdominal pain and dysmenorrhea (painful menstruation). Treatment may include danazol capsules, mifepristone tablets, or medroxyprogesterone acetate tablets, used as directed by a physician.

5. Lumbar Disc Herniation

Improper stress on the lower back during sexual activity may increase pressure on intervertebral discs, causing rupture of the annulus fibrosus and protrusion of the nucleus pulposus, which can compress nerve roots and result in post-coital back soreness and swelling. This is often accompanied by radiating leg pain and numbness. Medications such as diclofenac potassium tablets, hydrocortisone tablets, or Danlu Tongdu tablets may be used under medical supervision.

To maintain spinal health, it is advisable to avoid overly vigorous sexual activity, pay attention to force and posture, ensure sufficient rest, maintain regular sleep patterns, and engage in appropriate physical exercise.