causes of severe lower back and pelvic pain-distended stomach
Pelvic Inflammatory Disease. Pelvic inflammatory disease can cause lower back pain and lower abdominal pain. FamilyDoctor.org states that pelvic inflammatory disease is an infection of any of the female reproductive organs, including the uterus, fallopian tubes or ovaries.
Ectopic Pregnancy. An ectopic pregnancy can cause lower back pain and lower abdominal pain. An ectopic pregnancy occurs when a fertilized egg becomes implanted in a location outside the uterus.