Cardiology within internal medicine provides a dynamic and comprehensive approach to diagnosing and managing cardiovascular diseases. Advances in diagnostic modalities, pharmacotherapy, and procedural interventions have transformed the landscape of care, enabling more precise and personalized treatment strategies. The internist plays a vital role in integrating cardiovascular care within the broader context of systemic health, ensuring continuity, prevention, and optimized outcomes for patients across the spectrum of cardiovascular disorders. This book, Cardiology in Internal Medicine: Diagnosis and Management, is a comprehensive and clinically focused text that explores the integral role of cardiology within the broader practice of internal medicine. Designed for medical students, resident physicians, practicing internists, and specialists, the book bridges foundational cardiovascular science with practical, evidence-based approaches to patient care. It emphasizes the centrality of cardiovascular diseases in general internal medicine practice and aims to equip readers with the knowledge and skills necessary for accurate diagnosis, efficient clinical decision-making, and effective long-term management of cardiac conditions. The book begins by establishing a clear understanding of cardiovascular physiology and pathophysiology, allowing the reader to appreciate the underlying mechanisms that inform modern diagnostic strategies. It provides an in-depth examination of core cardiologic disorders, including ischemic heart disease, heart failure, arrhythmias, valvular abnormalities, hypertensive heart disease, and congenital cardiac conditions. Each chapter offers an integration of clinical presentation, diagnostic criteria, and current management guidelines, with attention to emerging therapies and technological advances. The text incorporates real-world case scenarios and emphasizes diagnostic reasoning, helping clinicians recognize the nuances of patient symptoms, interpret physical findings, and apply appropriate diagnostic tools. Special focus is given to diagnostic modalities such as ECG, echocardiography, cardiac biomarkers, advanced imaging, and cardiac catheterization, illustrating their role in guiding treatment strategies. The book also explores contemporary challenges such as the intersection of cardiology with systemic diseases like diabetes, renal dysfunction, and autoimmune disorders, highlighting the complexity of patient presentations and the importance of interdisciplinary collaboration. Attention is also directed toward gender differences in cardiovascular presentation and outcomes, with dedicated sections on women’s cardiovascular health.