Textbook of Eponymous Physical Signs & Markers in Gastrointestinal Medicine & Surgery is a need-driven clinical and medico-legal atlas created for a time when digestive and hepatobiliary diagnosis is increasingly dependent on imaging, endoscopy, and laboratory markers, yet litigation, delayed referrals, and missed malignancies continue to revolve around what was seen, palpated, percussed, and documented at the bedside; bringing together hundreds of classical and rare gastrointestinal signs—from Aaron’s Sign to Yellow Fever manifestations—this volume restores structured physical examination as the first line of diagnostic safety against overlooked abdominal emergencies, missed liver disease, silent gastrointestinal bleeding, evolving malignancy, intestinal obstruction, and postoperative complications, integrating historical origins, pathophysiological meaning, elicitation technique, surgical relevance, and documentation standards into a single coherent reference; designed for physicians, surgeons, postgraduate trainees, institutional libraries, medico-legal consultants, and pharmaceutical safety teams, each entry connects discovery, clinical application, risk interpretation, and forensic defensibility, reinforcing that subtle findings such as localized tenderness, altered percussion notes, abdominal wall rigidity, organomegaly, or cutaneous markers often determine both outcome and liability; in modern practice where diagnostic delays, incomplete records, or failure to recognize early warning signs frequently escalate into legal scrutiny, this book equips professionals to observe accurately, reason systematically, communicate clearly, and defend responsibly; more than a historical compilation, it is a contemporary diagnostic safeguard that re-establishes bedside gastrointestinal examination as an essential instrument of patient safety, postgraduate excellence, institutional credibility, and medico-legal protection in gastroenterology and abdominal surgery.