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.

A Physician Assistant is a medical professional who works with a team of other doctors to diagnose and treat a variety of illnesses and health disorders. They are legally licensed to practice medicine, though they do not go through the same rigorous schooling as doctors. However, these professionals are more than able to help patients with most medical conditions, and they work alongside doctors to ensure they can give adequate care to their patients.