An internist or Internal Medicine doctor is someone who specializes in diagnosing and treating illnesses, diseases, and health problems. Most internists are also primary care doctors and treat patients on a regular basis. They can diagnose and treat common illnesses or more serious problems. Most people see an internist regularly. Those with chronic illnesses may do so on a monthly or even weekly basis. Internists are the most common types of doctors.

Interventional radiology, which is also referred to as vascular and interventional radiology, uses minimally invasive radiology both to treat and diagnose diseases, disorders, and other problems a wide variety of patients may face. Generally, doctors in this subspecialty want to make the procedures they perform as minimally invasive as possible, as this reduces the possibility of other problems and complications. Physicians usually learn about interventional radiology while they are completing their residencies.