My Sister Have Had Problems For Years With Her Feet.

my sister have had problems for years with her feet. They hurt very bad on the tops of her feet . causing her sometimes very hard to bend her feet so she has to walk flat footed beause she bend them.
doesn't hurt all of time.but a lot. She has been to several drs. and to no avail. They don't hurt to push or hit them but just a lot of pain. Takes a lot of asprin that sometimes help the pain