Common causes for left-side body pain include cystitis, diverticulitis, inguinal hernia, kidney stones and thoracic aortic aneurysm, says Mayo Clinic. Even appendicitis can be a cause of pain in the lower left side of the abdomen. Pain in the left upper abdomen can be caused by angina, an enlarged or ruptured spleen, kidney stones, pancreatitis, or heart attack.
In cases of sciatica, the person feels a pain that shoots down the left buttock, down the leg, and into the feet and toes, according to Mayfield Clinic. The causes of this pain may be a herniated disc, trauma, arthritis or a narrowing of the spinal canal through which the nerves travel.
Many female reproductive problems present with pain in the left lower abdomen, according to Mayo Clinic. They range from endometriosis, ovarian cysts, pelvic inflammatory disease or salpingitis. Salpingitis occurs when the fallopian tubes are inflamed. Endometriosis is an abnormal buildup of uterine tissue on places outside the uterus, according to WebMD.
Another condition is mittelschmerz, says Mayo Clinic. This condition happens halfway through a woman's menstrual cycle and is associated with ovulation. The pain is felt on the side of the ovary that is releasing the egg, and for some women the left and right sides alternate every month.