Complex adult care increasingly requires collaboration across specialties and attention to emerging subspecialty topics. Volume 2 addresses interdisciplinary management—geriatric syndromes, multisystem diseases, transplant medicine, and advanced diagnostics. Chapters highlight team-based care models, rehabilitation, palliative approaches and integration with surgical and allied disciplines. Evidence summaries, referral guidance and case-based discussions illustrate when to escalate or coordinate care. The book is targeted at residents, subspecialists and clinicians navigating complicated medical problems. It emphasizes pragmatic strategies for high-quality, patient-centered internal medicine.