M.
M.,
If he did not do anything physically to hurt it (and at 8 I would assume he would remember something like that), then you should take him in to the docs. I don't know if he has ever been tested for diabetes or anything,,,but many things can manifest in foot pain. Neuropathies, etc...and most are associated with diabetes, although the liklihood of that being his issue is very slim (it could be growing pains too), it is still worth letting a doc check him out. Hope that helps!