If you have flat feet, you may wonder how you got flat feet. You probably don’t know that the condition of having flat feet is also known as Pes planus, fallen arches, and pronation of feet. It is a condition that can appear in childhood or in the elderly. If you have flat feet, you also have probably looked at he bottom of your foot and realize it isn’t exactly flat after all! So what are flat feet and what are the causes of flat feet? Here are some answers to those questions and more.