Health care ethics is a term that has come very much to the fore in the National Health Service during the past few years due to greater awareness of the subject and issues involved and challenging attitudes on the part of both health care professionals and patients. With advances in technology conflict of ethics has arisen, further increasing this subject's profile. This paper commences by defining some of the terms associated with health care ethics, followed by an explanation of two of the main underlying philosophical theories of medical ethics in modern health care practice.