Flat foot is a condition in which the arch of the foot has collapsed, with the entire sole of the foot coming into direct contact with the ground. Causes of flat feet include genetics, tendon failure, and abnormal tendon function and bone structure.
In most cases, there is no pain associated with flat feet. However, the condition may lead to misalignment to other structures of the feet. Pain may develop in the arch, calf, and perhaps the lower back. In severely flat feet, patients may have pain that makes moving and/or standing difficult. Prolonged standing or strenuous athletic activity often worsens this pain.