Crohn's Disease (CD) is an inflammatory bowel disease. It can lead to significant complications and discomfort in the stomach and intestines. Crohn's disease is a debilitating, incurable disease of immune cells; it affects almost 1 million people in the United States...

The purpose of this observational study is to find the best measures to define how well a person with eosinophilic disorder is doing. People with EoE, EoG, EoN and EoC normally undergo endoscopy and/or colonoscopy where cells are collected for microscopic analysis. T...