The branch and specialty of medicine concerning the diagnosis and nonsurgical treatment of diseases in adults, especially of internal organs is known as Internal Medicine.
Doctors of internal medicine are also called "internists", are required to have included in their medical schooling and postgraduate training at least three years dedicated to learning how to prevent, diagnose, and treat diseases that affect adults.
Sub-Specialities under Internal Medicine:
- Cardiology: deals with disorders of the heart and blood vessels
- Endocrinology: deals with disorders of the endocrine system and its specific secretions called hormones
- Gastroenterology: deals with the field of digestive diseases
- Hematology: deals with blood, the blood-forming organs and its disorders
- Infectious disease: deals with disease caused by a biological agent such as by a virus, bacterium or parasite
- Medical oncology: deals with the study and treatment of cancer
- Nephrology: deals with the function and diseases of the kidney
- Pulmonology: deals with diseases of the lungs and the respiratory tract
- Rheumatology: deals with the medical diagnosis and therapy of rheumatic diseases.