This book offers an integrated symptom- and issue-based approach to internal medicine. Fully updated and revised, the Fourth Edition provides clinicians and trainees with a high-yield, evidence-based, and concise resource for everyday use, bedside teaching, and examination preparation. It presents over 250 internal medicine topics classified under 17 subspecialties. For each topic, differential diagnoses, investigations, and treatments are outlined. Comparison tables aimed at highlighting the distinguishing features between various clinical entities are featured and numerous clinical pearls and mnemonics enhance understanding of the topics. The book covers many highly important topics in medicine; for example, smoking cessation, obesity, transfusion reactions, needle stick injuries, code status discussion, interpretation of gram stain, and palliative care.  Approach to Internal Medicine, Fourth Edition, continues to serve as an essential reference for every medical student, resident, fellow, practicing physician, nurse, and physician assistant.