Internists are personal physicians who provide long-term, comprehensive care, managing both common and complex illnesses. Internists are trained in the diagnosis and treatment of cancer, infections, and diseases affecting the heart, blood, kidneys, joints, and digestive, respiratory and vascular systems. They are 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. An internal medicine physician’s primary responsibilities include heath maintenance and disease screening, the diagnosis and care of acute and chronic medical conditions, and management of patients with multiple, complex medical problems.