There have been studies that show evidence that Crohn's disease runs in families, with about 15% of patients having a close relative with the disease.

Crohn's disease is a chronic inflammatory bowel disease with symptoms such as abdominal pain, severe diarrhea, fatigue, weight loss, and malnutrition. Based on the effect on different areas of the gastrointestinal tract, Crohn's diseases can be classified into 5 types.