Overview
Tarsal tunnel syndrome is compression of the posterior tibial nerve as it passes through the tarsal tunnel in the ankle.

Causes and risk factors
Flatfoot, ankle injury, swelling, or space‑occupying lesions can compress the nerve.

Symptoms
Burning, tingling, or numbness in the sole of the foot, sometimes radiating to the toes.

Diagnosis
Clinical exam; nerve conduction studies may help.

Treatment
Activity modification, orthotics, NSAIDs, and sometimes corticosteroid injection. Surgery is considered for persistent cases.

When to seek care
Persistent numbness or pain should be evaluated.