This document discusses several key ethical issues in medicine: informed consent, confidentiality, decision-making capacity, euthanasia, and malpractice. It defines informed consent as agreement by the patient to undergo examination or treatment, which requires competency and being informed of benefits, risks, and alternatives. Confidentiality is the duty of doctors to respect patient privacy in treatment and after death, with some exceptions like abuse. Decision-making capacity refers to understanding one's illness and treatment options. Euthanasia is administering a lethal drug to a patient with full consent. Malpractice requires establishing through evidence that a physician wronged and harmed a patient.