Non verbal communication in health and social care?

This is rather a vague question.

The most effective non verbal communication, in that, the message is never misinterpreted, is a good slap in the face.

However, verbal communication is an absolute necessity in any type of care situation, and non verbal (and never aggresive, despite the opening of this answer) is secondary, unless there are language barriers, and if there are, then an interpreter is required, in order to make verbal communication a possibility. Sounds expensive, but that's why England, Canada and Australia rock, as this won't cost you a thing in these countries. If you are American, you have the right government / president to make these wonders possible - lobby for it.

It is inexcusable for anyone providing you with any trype of care to not respect you enough not to provide you with clear, concise communication.