Pain in the bottom of stomach. how come?

Lower Abdominal pain: Cause of lower abdominal pain include but are not limited to: appendicitis, bladder infection or inflammation, inguinal hernia, diverticulitis, ulcerative colitis, crohn’s disease, kidney stone or infection, cancer, pelvic inflammatory disease, seminal vesicle inflammation, ectopic pregnancy, endometriosis, ovarian cyst, aortic aneurysm, injury and intestinal obstruction.