If you have/had a fight coming up and wasn't 100% fit what would you do, would you consider pulling out or would you truck on through the pain?

Specifically I am talking about a whiplash sort of injury.

I mean whiplash can affect your neck, back and shoulders which to me would seem like a pretty fucking major thing to be struggling with when going into a fight, on the flipside though if you are a pro and you are getting paid for it would you let a whiplash injury with a prognosis of say 12 months stop you from fighting?

I've had whiplash and I know for a fact that for 2 months I could barely masturbate with my right hand so I know it can be debilitating but again the fighters brain works differently to the average persons.

What sort of checks do the BBBofC do before a fight or is it generally down to the fighter to ensure that he is physically fit enough to get in the ring?

This is something that is work related for me and its been doing my head in all day so I thought I'd come to the experts.