Disorders of the gastrointestinal tract make up some of the most common illnesses experienced across the lifespan affecting individuals in infancy, childhood and adulthood. This essential guide to the gastrointestinal system will enable nurses and allied health professionals to apply principles of anatomy and physiology to clinical practice. Taking a practical and evidence-based approach, each chapter explores associated anatomy, function and abnormalities. Chapters use selected pathology and associated pathophysiology, from across the lifespan, to support understanding of how disorders can disrupt the development and function of the gastrointestinal tract. The accessible writing style and full colour illustrations make this an ideal introduction for students and professionals new to gastrointestinal care.