Eosinophilic Enteritis

Eosinophilic enteritis is a pattern of inflammation in the small intestine in which a particular type of white blood cell—the eosinophil—accumulates in unusually high numbers within the intestinal wall. Eosinophils are part of the immune system and typically respond to parasites or allergens, but in this condition they gather in the gut lining in ways that can disrupt normal digestion and absorption. The underlying trigger is not always identified. Owners often notice recurring or persistent signs related to the digestive system: soft stools, diarrhoea, weight loss despite a normal appetite, or intermittent vomiting. The signs can develop gradually and may wax and wane over weeks or months. Because several other conditions can produce similar patterns, the path to identifying eosinophilic enteritis typically involves excluding other causes and, in many cases, examining a sample of intestinal tissue. This page explores the signals that may point towards this pattern of inflammation, the mechanisms that may drive it, the investigations used to distinguish it from other causes of chronic digestive upset, and the range of approaches—dietary, medical, or both—that are used to manage it over time.