The following are some of the most common causes. Gastritis,nflammatory bowel disease,Hemorrhagic disorders,Leukopenia,Immunodeficiency. Persons with artificial openings, Hernia, including inguinal, and other abdominal,Gastrointestinal bleeding,Congenital, Intestinal malabsorption syndromes, including postsurgical and idiopathic. Esophagus. Ulceration, varices, fistula, achalasia, or other dismotility disorders. If any of these presents,the person may be disqualified.