I heard it was a bad back, not true though
i've suffered off and on with a bad back for years as well and the best thing for it is exercise. i had 12 months of physio for mine all aimed at getting me more active and mobile culminating in a load of free gym sessions at gateshead NHS's expense under physio supervision. If i get any twinges or pain at all now i go for a run or do some exercises and hey presto it lossens it up and kills the pain.
Physios used to say to us at the group sessions that excercise makes the body produce natural pain killers hence the term "run it off".
I don't believe the bad back thing, the whinging twat cried off because of blisters end of.