“…Although the list of pathologies that can cause referred pain to the legs or hip is "painfully" long, some that have been known to present this way include psoas abscess, appendicitis, discitis, urinary tract infection, ectopic pregnancy, torsion (of the ovarian or testicular variety), and pelvic inflammatory disease. 18,[28][29][30] Most of these diseases cause referred pain through irritation of the iliopsoas or obturator internus muscles or obturator nerve, which innervates to the distal thigh and knee. Just remember that it's never normal for a child to be limping.…”