This textbook provides insights into common benign and malignant diseases of the upper gastrointestinal tract, including the esophagus, stomach, and small intestine, covering anatomy, cancer, and functional diseases. Divided into 11 sections, the book offers up-to-date insights into epidemiology, physiology, pathology, diagnosis, treatment, and care with an emphasis on advanced treatments, including surgery, therapy, and radiotherapy, from both eastern and western perspectives. Chapters address specific conditions such as esophageal and gastric cancer, along with innovative approaches to surgery and systemic treatments. It also discusses key concepts in bariatric surgery, small intestine disorders, and postoperative care. The book is supplemented with ample illustrations to tackle the challenges of treating diseases in the upper gastrointestinal regions due to the complex anatomy, aggressive biological behavior, and poor prognosis.The IASGO Textbook of Multi-Disciplinary Management to Upper Gastrointestinal Diseasesaims to update academic and non-academic medical professionals, including gastroenterologists, gastrointestinal surgeons, general surgeons, radiation oncologists, medical oncologists, interventional radiologists, general practitioners, bariatric specialists, residents, medical students, and scientists, to gain insights into the understanding of upper gastrointestinal health and management.