Tarsal tunnel syndrome is caused by a nerve compression of the tibial nerve, just behind the medial ankle bone. This narrow passage, called the Tarsal tunnel, is also home to tendons and blood vessels, which can at times pinch the nerve. Symptoms include pain along the side, and sole of the foot, sometimes including the toes. However, numbness, 'pins & needles', tingling, burning or cold feeling or electric shock feeling are also reported.
Diagnosis requires the exact cause to be found, this will probably require an ultrasound scan.
Treatment options include, injection therapy, orthotics, stretching and strengthening exercises, an ankle brace in rare cases. If conservative treatment fails then surgery is an option.