Food allergies and eosinophilic gastrointestinal illness.

Eosinophilic gastrointestinal disorders are characterized by eosinophilic infiltration and inflammation of the gastrointestinal tract in the absence of previously identified causes of eosinophilia, such as parasitic infections, malignancy, collagen vascular diseases, drug sensitivities, and inflammatory bowel disease. These disorders include eosinophilic esophagitis, eosinophilic gastroenteritis, eosinophilic enteritis, and eosinophilic colitis. This article focuses mainly on eosinophilic esophagitis and eosinophilic gastroenteritis.