Our expert says:
They sometimes get "growing pains" in the longbones of the legs due to overexertion. Usually Panado and a heatpack/hotwaterbottle works quite well - just be careful not to make it too hot. If the area is tender or red, you feel any lumps, he walks with a limp, he loses weight or seems unwell overall, he needs to see a pediatrician to exclude other serious causes like a tumour or bone marrow disease
See also http://kidshealth.org/parent/general/aches/growing_pains.html
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