Re: I need help. my son plays football, I have a problem with his feet!
mmmm yes sounds like could be flat feet/pronation (people with flat feet tend to pronate when running, which is roll the feet towards the inside) or plantar fascitis, though I think PF pain tends to be more on the bottom than on the sides. Definitely take him to see a foot/ankle ortho with sports medicine specialty, or sports medicine ortho with foot/ankle speciality (what Titchou said). Once you know what it is, might be able to improve situation with some combination of stretching, orthotics, and different shoes.