Hemolytic anemia Diabetes mellitus Porphyria GERD, gastroesophageal reflux disease; UTI, urinary tract infection Modified from Liebman W, Thaler M Pediatric considerations of abdominal pain and the acute abdomen In: Sleisenger M, Fortran J, eds Gastrointestinal Disease Philadelphia, PA: WB Saunders; 1978 Copyright © 1978 Elsevier With permission