Tarsal tunnel syndrome is pain, tingling, or numbness in the sole of the foot due to pressure on the tibial nerve, which runs down the back of the leg, around the ankle, and into the foot.
At the ankle, the nerve passes through the tarsal tunnel, a space formed by the ankle bones and bands of supporting tissue. Tarsal tunnel syndrome occurs if the space is constricted and the nerve is compressed, commonly as a result of overuse, injury, or arthritis.
Tarsal tunnel syndrome is also more common in people with a condition known as flatfeet.
Treatment is with rest, medication, or sometimes surgery.