This document discusses several ethical principles related to terminal illness: respect for autonomy, beneficence, non-maleficence, and justice. It notes that physicians must obtain informed consent from competent patients before treatment, even if terminally ill. The principle of beneficence means doing good and helping patients through preserving life, restoring health, relieving suffering and maintaining function. Non-maleficence means avoiding harm. Justice means equitable distribution of medical resources. Ethical decisions in terminal illness are generally made on an individual basis considering these principles.