Although the internal medicine doctor in bend is expected to know the rarest disease and condition, they can also subspecialty. According to the American College of Physicians, the largest organisation for internists, there are 13 possible areas of expertise for physicians in the disease. These include:

– Adolescent Medicine, including psychological and sexual development
– Sports Medicine
– Oncology, such as radiation and surgery
– Immunology, which deals with any condition that affects the immune system like allergies
– Haematology (conditions affecting the blood)
– Cardiology
– Nephrology (conditions affecting the kidneys)
– Endocrinology, including diseases and conditions associated with metabolism and hormones
– Geriatrics
– Infectious diseases
– Gastroenterology (conditions affecting the intestinal tract and colon)
– Rheumatology
– Pulmonology

This means that pulmonology, which specialises in the lungs, is also regarded as an internist, provided that it only deals with adult patients. Because internal medicine can be very extensive, the length of training for internists varies greatly. Typically, they start with eight years of education including four years in medical school. They then went on an internship program for a common illness, which could last for five years. If they want to specialise in a particular area of specialisation, they will need at least 1 to 3 more years.