Doctors of internal medicine focus on adult medicine and have had special studies and training focusing on the prevention and treatment of adult diseases. Internists trained in the diagnosis and treatments. Especially for infections, and diseases affecting the heart, blood, kidneys, digestive, respiratory, and vascular systems.
They have also trained in the essentials of primary care internal medicine which incorporates an understanding of disease prevention, wellness, substance abuse, mental health, and effective treatment of common problems of the eyes, ears, skin, nervous system, and reproductive organs.