Sometimes conditions or diseases of the female reproductive organs in the pelvis may cause lower back pain. Usually, there are other symptoms besides the back pain. Endometriosis and fibroids in the uterus are two of the most common causes.
If endometriosis is the condition, there may be pain in the low abdominal area before or during periods, and better afterwards. Some women will have painful sexual intercourse, or pain with urination or bowel movements related to problems in the female reproductive organs.
Enlargement of the uterus due to the growth fibroids may cause an aching or dull lower back pain by pressing on the muscles and nerves of the low back. Fibroids may cause a feeling of heaviness or pressure in the pelvic region, frequent urination, and a sometimes a sensation of rectal pressure with bowel movements. Unusually long or heavy menstrual periods are common, and may cause anemia.
Routine gynecologic care, along with informing your health care provider about the low back symptoms will usually lead to a correct diagnosis, proper treatment and pain relief.