Why do my feet hurt when I play basketball?

Back when I was in 7th grade, I went to the foot doctor and got some foot insoles/inserts because apparently I have flat feet. Well, I never wore them and never had any problems with my feet, until now that is

Back when I was in 7th grade, I went to the foot doctor and got some foot insoles/inserts because apparently I have flat feet. Well, I never wore them and never had any problems with my feet, until now that is

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Why do my feet hurt when I play basketball?