If you have flat feet, your feet don’t have a normal arch when you’re standing. This can cause pain when you do extensive physical activity.
The condition is referred to as pes planus, or fallen arches. It’s normal in infants and usually disappears by age 2 or 3 as the ligaments and tendons in the foot and leg tighten. But, it can last through adulthood: 25 percent of American adults have this condition. Having flat feet is rarely serious.
In some cases, flat feet are caused by injuries or illness, creating problems with walking, running, or standing for hours.