The most common symptom of flat feet is pain in the feet. This can occur as a result of strained muscles and connecting ligaments.
Abnormal stresses on the knee and hip may result in pain in these joints. These stresses are likely if the ankles turn inward.
Pain most commonly affects the following parts of the body:
inside ankle, alongside possible swelling
arch of the foot
One or both feet may also feel stiff.
Flat feet can also cause an uneven distribution of body weight. This may result in shoes wearing down unevenly or more quickly than usual, especially on one side, which can lead to further injuries.