Causes of pain in the lower left quadrant include: constipation irritable bowel syndrome, gas and diverticulitis can cause pain in the intestines. A urinary tract infection or kidney stone may cause lower abdominal pain. Heart disease can cause pain in the abdomen, as can pneumonia, pancreatitis or an ulcer. Ovulation, menstruation, pelvic inflammatory disease, endometriosis, uterine fibroids, ovarian cysts, miscarriage or an ectopic pregnancy can cause pain.