Conditions that can commonly cause pelvis and lower back pain include pelvic inflammatory disease and pelvic congestion syndrome, according to WebMD. Other conditions include irritable bowel syndrome, uterine fibroids and levator syndrome.
Pelvic inflammatory disease is an infection of the uterus, fallopian tubes and ovaries that is usually caused by a sexually transmitted infection such as gonorrhea or chlamydia. Its symptoms include pelvic pain when pressure is applied, lower back pain, a frequent need to urinate, pain while urinating or ovulating, and irregular or missed periods, according to WebMD. Other symptoms include abdominal or pelvic pain in specific areas, pain during sex, abnormal vaginal discharge, fatigue and fever. Nausea may also occur.
Pelvic congestion syndrome is a condition that affects the veins of the pelvis. The veins become similar to varicose veins that appear in some individuals' legs and arms. The symptoms of pelvic congestion syndrome include pelvic pain, lower back pain, pain that occurs seven to 10 days before menstruation, pain that becomes worse when sitting or standing, and aching legs, according to WebMD. Other symptoms include pain during sex and pain that is relieved by lying down.
Other conditions that may cause pelvic pain in some cases include irritable bowel syndrome, uterine fibroids, levator syndrome and vulvodynia, according to WebMD.