I'm doing my sociology assignment and i'm having no trouble finding what concepts of health are I just can't find an overall definition for each,

I especially can't find anything on concepts of ill health.

It would be a great help if someone could personally help more or just had any useful websites.

Ohh and also another part is to show what it meant by the term 'model' of health, in my head i know what one is I just can't think how to put it into words.