Flat feet and fallen arches are terms used to describe lowering of the long inner arch of the foot. For a long time, flat feet were thought to be the sign of a poorly developed or structured foot. However, in recent years it has been found that people with flat feet are no more prone to injury or soreness than others. In fact, recent research involving army recruits has shown that recruits with flatter feet tended to suffer less problems than those with normal or high arched feet.
The most critical factor in foot soreness and injury is the way you walk and move, not how flat or high your arches are. If your feet move abnormally while you are walking or standing, this can make you more prone to injuries and foot soreness.
To assess the cause of foot pain it is often best to seek the professional advice of a Sports Doctor, Physiotherapist or Podiatrist.