This document provides an overview of gastrointestinal (GI) cancers, including esophageal cancer, gastric cancer, pancreatic cancer, and colorectal cancer. It discusses the anatomy and types of GI cancers. For each cancer type, it covers causes and risk factors, symptoms, diagnostic tests and treatments. Nursing management focuses on maintaining nutrition, managing pain and complications, emotional support, and education. GI cancers remain a significant health problem globally due to lack of screening and risk factors like smoking, diet, infection and family history. Early detection through screening and lifestyle changes can improve outcomes.