Flat feet is a condition where the arch of the foot, the inner part that is slightly raised off the ground when you stand, is flat with the floor. People with flat feet or fallen arches either have no arch, or it is very low.
The most common symptom of flat feet is pain. Pain may occur in the feet, if the connecting ligaments and muscles are strained. That pain can continue up the legs to the knees, hips and back due to the body’s alignment being off.