This book presents a comprehensive and contemporary overview of hepatogastroenterology bridging molecular science with clinical practice. It explores emerging concepts in disease mechanisms diagnostics and therapeutics integrating advances in immunotherapy microbiome research regenerative medicine and digital health. The book emphasizes personalized and precision-based strategies in managing chronic liver diseases gastrointestinal cancers and functional disorders. It also highlights the role of multidisciplinary care lifestyle modification and global research collaborations in improving patient outcomes. Written in a clear evidence-based style this work serves as an essential reference for medical students clinicians and researchers seeking to understand the evolving landscape of digestive health in the 21st century.