Internal medicine is a medical specialty focused on the diagnosis, treatment, and prevention of adult diseases. Internists, or doctors specializing in internal medicine, are trained to handle a broad range of conditions that affect the internal organs and systems of the body, such as the heart, lungs, kidneys, and digestive tract. They are skilled in managing complex or chronic illnesses and often serve as primary care physicians, coordinating care with other specialists when needed.

Internists emphasize a comprehensive approach to patient care, considering the whole person and how various health issues might interrelate. They are also involved in health promotion and disease prevention, aiming to maintain or improve overall health and quality of life.