Flat feet (pes planus) is usually a painless condition in which the arches of your feet are flattened and when you are standing the entire soles of your feet touches the floor. Flat feet can change the alignment of your legs and can lead to knee and ankle problems. Infants and toddlers have flat feet since the arches of their feet have not yet developed. As they get older, the arches will develop. However, some people’s arches never develop and this would lead to flat feet. A foot or an ankle injury, aging, rheumatoid arthritis and obesity can all increase your risk of flat feet. One may experience pain in the heel or arch area of the foot and the pain may get worse with activity. Orthotics or supportive shoes can help reduce symptoms and make your feet feel more comfortable.