“Flat feet” is a loose term that defines the lack of height of the inner arch as compared to the normal arch. There are varying degrees of how flat an arch can become. Not all flat feet are created equal. Some low arches are flexible, meaning that the arch can be manipulated and flexed, while others are rigid and static. Not all people with flat feet have pain or difficulty with activity. A child with flat feet will not necessarily develop pain or problems in the future. Not all flat feet need treatment.