Medical or Medicine is the applied science or the practice of the diagnosis, treatment and prevention of the disease. There are many subspecialities (or sub disciplines) of internal medicine: Cardiology, Critical care medicine, Endocrinology, Gastroenterology, Geriatrics, Haematology, Hepatology, Infectious diseases, Nephrology, Oncology, Pediatrics, Pulmonology/Pneumology/Respirology, Rheumatology and Sleep medicine. There are various career opportunities for medical candidates in government sector. They can work as doctors in government hospitals or various government institutions.