There are several subdisciplines of internal medicine: Cardiology, Critical care medicine, Endocrinology , Gastroenterology, Geriatrics , Hematology, Hepatology , Infectious diseases, Nephrology, Oncology Proctology, Pulmonology, Rheumatology, Sleep medicine, Neurology , Dermatology.
心脏病学，重症监护学，内分泌学，胃肠病学，老年医学，血液学，肝脏病学，传染病学，肾病学，肿瘤学，直肠病学，肺病学，风湿病学，睡眠医学，神经病学和皮肤病学。