Inflammatory bowel disease (IBD) describes disorders that involve chronic inflammation of the digestive tract, including ulcerative colitis and Crohn's disease. The exact cause is unknown but is likely related to malfunctions of the immune system. Symptoms vary in severity from mild to severe and include diarrhea, abdominal pain, bleeding, and weight loss. Diagnosis involves blood tests, endoscopy, imaging, and ruling out other potential causes. Treatment aims to reduce inflammation and includes anti-inflammatory drugs, immunosuppressants, antibiotics, and surgery in some cases.