Geriatric medicine focuses on the health of elderly people. As they age, many people experience age-related health problems, such as fragile bones, skin problems, and issues with eyesight and hearing. Doctors who specialize in geriatric medicine can provide services and solutions for many of these problems. Not only do these physicians treat potential problems, but they also work with patients as they age to help them maintain health, mobility, and quality of life.

A hospitalist is a doctor who works only in a hospital setting. Hospitalists care for patients who are staying in the hospital to recover from an illness or a surgery. Most hospitalists are also internists, and many primary care doctors are hospitalists. Some of them also work in subspecialties or have work in other areas early in their careers. Hospitalists coordinate care for patients admitted in the hospital. They play the role of Primary care doctors in hospital settings.

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.