This document discusses medical ethics and ethical issues in public health. It begins with background on the history of medical ethics and the high esteem doctors have held. It defines ethics as moral principles and rules of conduct. The four main principles of medical ethics are discussed as beneficence, non-maleficence, autonomy, and justice. Several ethical issues in everyday medical practice and current problems like AIDS, abortion, and euthanasia are examined. Ethical issues specific to public health like immunization, water fluoridation, and infectious diseases are also analyzed through case studies. The document concludes that representative and consensus-based processes should guide decisions on ethical issues in public health.