My stomach hurts on the left side what could be wrong?

Left abdominal pain: Left abd. Pain causes include but is not limited to: ovarian cyst, ectopic pregnancy, diverticulitis, endometriosis, inguinal hernia, ovulation pain, intestinal obstruction, crohn’s disease, abscess, ulcerative colitis, seminal vesicle inflammation, cancer, aortic aneurysm, renal infection or stone, injury, angina, heart attack, pneumonia, enlarged or ruptured spleen, pancreatitis & obstipation.