A health care declaration, also known as an advance directive, is a legal document that communicates an individual's wishes regarding medical treatment if they are no longer able to do so. Some synonyms for health care declaration include living will, advance health care directive, healthcare power of attorney, and medical power of attorney. A living will is a document that outlines an individual's medical preferences and end-of-life decisions. An advance health care directive typically includes both a living will and healthcare power of attorney, allowing a trusted person to make medical decisions on behalf of the individual. A medical power of attorney designates someone to make healthcare decisions if the individual cannot, and may or may not include instructions for end-of-life care.