Cardiology is a specialty of medicine which deals with problems of heart, arteries and veins. Doctors specializing in Cardiology are called Cardiologists and they treat conditions like heart attack, leaky or narrow valves, heart failure and more.

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.

A pediatrician is a healthcare professional who specializes in treating children. They offer physical, behavioral, and mental care for children from birth until age 18. They diagnose and treat common childhood illnesses and health problems as well as more serious health conditions.They also monitor children with checkups to make sure they are growing properly and hitting the correct milestones.