it can be due to tight shoes or prolonged standing jobs.
according to me he should do some mild exersices like-(1)stretching his toes towards his body n then away from it(not with hands,it should be done while sitting on a flat surface with legs stretched streight)
(2) rotate feet in clockwise and then anticlockwise(vice verca)at ankles
these exersices should be done slowly avoiding any jirk
this will improve his blood circulation to his feet
if he do these exersices daily in the morning for 10-10 minutes ,i m sure he will feel better
Has he does this his whole life? Maybe he started when he was young and got used to it. It could be something with the ankles too, though. You should ask a podiatrist about it, like what SassyLassie said. I'm sure it would help!
I am not sure, have you asked a podiatrist about this?