Can an injured person refuse first aid?

An injured person can refuse treatment. Although you should explain the consequences if they refuse treatment. For example, if somebody has a wound and they refuse treatment you should explain how it could get infected if not treated.

However, if a patient has a possible injury to their head or is unable to make appropriate decisions due to a neurological condition then you could treat the patient but if you are a first aider then you should not treat the patient yourself and should contact 999 for further advice. As it is a grey area and can really depend on that specific case.