The following points highlight the three major diseases of gastrointestinal tract:- 1. Diseases of the Mouth 2. Diseases of the Oesophagus 3. Peptic Ulcer. Gastrointestinal Tract: Disease # 1. Diseases of the Mouth: Lesions primarily nutritional in origin are angular stomatitis, cancrumoris, nutritional parotitis and nutritional glossitis. Glossitis is often a presenting feature in pellagra, […]