The law says you have the right to receive the support you need to make your own medical treatment decisions.
Privacy laws mean organisations cannot give information about you to someone else without your permission, even if they are helping you.
By appointing someone as a medical support person, you are giving them authority to get information about you to help you make a decision.
This also lets others know that you have chosen a particular person to support you and makes their role clear to everyone.
Adults and children with decision-making capacity can appoint someone as their medical support person.