Psychosocial oncology is a specialty concerned with understanding and treating the social, psychological, emotional, spiritual, and quality-of-life aspects of cancer care from prevention through bereavement. It focuses on assessing and treating distress as well as managing complex issues. The principles of psychosocial oncology emphasize person-centered care, access, ethical practice, respect for diversity, inter-professional collaboration, and evidence-based and quality care. Ethics involves evaluating actions as right or wrong according to moral principles, and professionals have duties including maintaining boundaries, ensuring confidentiality with clients, obtaining informed consent, and handling ethical dilemmas through a process of identifying issues, considering solutions, selecting the best option, and defending that decision.