Advance Directives, such as Health Care Proxies and Living Wills, allow people to retain control over medical decisions. Massachusetts law allows people to make their own Health Care Proxies, but does not officially recognize Living Wills. A Health Care Proxy designates another person to make medical decisions should you be unable to do so, and a Living Will allows you to list medical treatments that you would or would not want if you became terminally ill and unable to make your own decisions.