<<Disclaimer: Verify this information before applying it to your situation.>> THe differential diagnosis for CD is very broad indeed. If one takes classic malabsorptive CD then the differential includes the follwing not exclusive list Giardiasis Common variable hypogammaglobulinemia IgA def Crohn's disease Whipple's disease Cow milk allergy( in kids) Pseudoobstruction Ischemic bowel Scleroderma of the small intestine intestinal diverticulosis rare cangenital defects in the mucosa Bacterial overgrowth syndromes Pancreatic failure Effects of some drugs HIV enteropathy protein losing enteropathy( lymphangiectasia) The list goes on forever. Most can be distinguished on biopsy and with other tests but this is a very complex part of the body and not very accessible to examination Some of these can coexist with CD If one considers all of the possible presentations of CD then there is even wider number of possibilities. Joe Murray **Not medical advice**