An internist is a physician who practices in internal medicine. Mostly Internal medicine concentrates on the diagnosis, prevention, and therapy of wounds and conditions. Internal Medicine physicians give complete care for grown-ups with a broad understanding of conditions, are specialists in the analysis, and improve preventive care and wellness. Internal medicine doctors may take a subspecialty of internal medicine such as rheumatology, pulmonology, cardiology, or gastroenterology. An internal medicine doctor that expert in cardiology, for instance, is a cardiologist.