Idiopathic inflammatory bowel disease: Def: Chronic nonspecific inflammatory reaction Causes: may be genetic disorders, autoimmune reaction (Normal intestinal flora), infections, and psychological stress. Classification: Ulcerative colitis and Crohn's disease. Ulcerative colitis occurs in large intestine starts in the rectum but Crohn's disease occurs in the terminal ileum. Age: occurs in the young adult in both sex (20 - 30) years old clinical pic: Both of cases complain from attack and abdominal pain but Ulcerative colitis: make diarrhea and bleeding Crohn's disease: thinking in the rt. iliac region leading to palpable mass.