Often people with flat feet have no significant signs or symptoms of this condition. When symptoms occur, one may note heel and arch pain and swelling after physical activity. Changes in leg alignment due to flatfeet can contribute to fatigue of the lower leg muscles, muscular pain, and injury of the menisci.
Swelling along the inside of the ankle can also occur. Another serious injury that can be provoked by flatfeet is tendinitis of the Achilles tendon, which runs down the back of your leg. This occurs because the tendon has to work harder to compensate for the lack of arches during pushing off from the ground and lifting the heel when taking a step.