Internal medicine is a medical specialty focused on the diagnosis, treatment, and prevention of a wide range of adult illnesses. Internists, or doctors of internal medicine, are experts in managing complex and chronic conditions such as diabetes, hypertension, and heart disease. They often serve as primary care physicians, providing comprehensive care that includes health promotion, disease prevention, and the management of acute and chronic illnesses. Internal medicine emphasizes a holistic approach, considering all aspects of a patient’s health.