Clinical gastroenterology examines the structure and function of the digestive tract and the medical care of its diseases. This comprehensive guide reviews GI pathophysiology alongside clear diagnostic pathways for common and complex disorders—from acid peptic disease to inflammatory bowel disease and liver pathology. Each chapter pairs symptoms with best-practice investigations, interpretation of labs and imaging, and stepwise therapeutic options including medical, endoscopic, and surgical approaches. Practical algorithms and flowcharts help clinicians choose evidence-based treatments and follow-up strategies. Special sections address nutrition, cancer screening, and long-term care for chronic GI conditions. Written for gastroenterologists, internists, and trainees, the book emphasizes clinical decision-making and patient-centered care.