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 colorectal surgeon is a medical professional who is experienced with the colon and rectum and is capable of diagnosing and treating diseases that affect these parts of the body. They treat illnesses and diseases that range from mild to severe, and they sometimes work with other specialists and doctors to determine how to treat their patients properly. They are sometimes referred to as proctologists.

A general surgeon is a medical professional who performs surgery on patients. General surgeons typically perform common surgeries and have attended college and medical school to learn the skills needed to perform them successfully. They also care for their patients before and after operations and can give an accurate prognosis after the surgery is complete and the patient has had time to heal.

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.