Flat feet might be congenital (ie that you are born with it) or can acquire as time passes. Most who are afflicted with flat feet haven't any signs and standard foot function. But for Other individuals it causes pain and distress. Genu valgum (knock knees) Genu valgum or "knock knees" https://www.theorthopaedicandpainpractice.com/treating-foot-arch-pain-with-modern-orthopaedic-pain-management-techniques/