Irritable bowel syndrome, dumping syndrome. Amyloidosis, diffuse intestinal lymphoma, scleroderma. VIPoma, carcinoid tumor, pheochromocytoma, ganglioneuroma. Look for abdominal tenderness, distension, organomegaly, anal fistulas, rectal mass, and hyperactive bowel sounds. CBC with differential.
Anemia is suggestive of chronic blood loss, infection, malabsorption, or neoplasm.
Eosinophilia may be secondary to parasitic disease or allergic reaction. Megaloblastic anemia may result from vitamin B 12 or folate malabsorption. If elevated, may indicate chronic inflammation. Serum electrolytes, magnesium, iron, renal function, albumin, cholesterol. Calcium, phosphate, and alkaline phosphatase levels to evaluate for parathyroid disease.