Inflammatory bowel disease or IBD is a broad term used to describe disorders that involve chronic inflammation of the digestive tract. The two types of inflammatory bowel diseases are ulcerative colitis and Crohn's disease. Some of the symptoms of IBD are diarrhea, rectal bleeding, abdominal pain, reduced appetite, fatigue, and weight loss. Diet, stress and immune system malfunction are a few of its suspected causes. Inflammatory bowel disease is diagnosed by endoscopic procedures such as colonoscopy, flexible sigmoidoscopy, upper endoscopy, capsule endoscopy and balloon-assisted enteroscopy. It can be treated by anti-inflammatory drugs, immune system suppressors, biologics, antibiotics, nutritional support and surgery. If not treated, it can lead to serious medical issues such as colon cancer, skin, eye, and joint inflammation, primary sclerosing cholangitis, and blood clots. This book discusses the fundamentals as well as modern approaches to inflammatory bowel disease. It presents researches and studies performed by experts across the globe. This book will provide comprehensive knowledge to the readers.