is a condition that causes a type of white blood cell called an eosinophil to build up in the gastrointestinal system and in the blood. Eosinophils play a role in the bodyÕs immune response by releasing toxins. Eosinophils are associated with allergic-type reactions, but their specific function is largely unknown.When eosinophils build up in the gastrointestinal tract, this begins to affect the body by causing polyps, tissue break down, inflammation, and ulcers. Eosinophilic enteropathy can occur in children or adults and is characterized by intolerance to some foods. Eosinophilic enteropathy can affect any part of the gastrointestinal tract, and is often named by the part affected: colon (colitis), esophagus (esophagitis), stomach (gastritis), or both the stomach and small intestine (gastroenteritis). Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.