Gastroenterology deals with the gastrointestinal tract and the hepatobiliary system, and forms an important and integral part of practice of medicine. It is imperative for a medical student to be well acquainted with the diseases of the gastrointestinal system primarily because this system practically forms the basis of life as it links the internal world of the body to the external world through the food, water, drugs etc. that are taken in from the external world and assimilated and utilized to maintain every single cell of the internal world.