Flat feet may be congenital (ie you happen to be born with it) or can build after a while. Most who are afflicted with flat feet have no signs and usual foot functionality. But for Some others it causes pain and distress. Here are the responses I identified to frequent https://www.theorthopaedicandpainpractice.com/treating-foot-arch-pain-with-modern-orthopaedic-pain-management-techniques/