Tarsal tunnel syndrome: symptoms, treatment, and when to worry
Last updated September 3, 2026.
Tarsal tunnel syndrome is compression of the tibial nerve where it passes behind the bony bump on the inside of your ankle, causing burning, tingling, or numbness in the foot. It is the ankle's counterpart to carpal tunnel syndrome in the wrist. Anything that crowds that tunnel, swelling, flat feet, a ganglion, arthritis, or an old injury, can set it off.
What does it feel like?
Symptoms live along the inner ankle and the sole of the foot: burning, tingling, pins and needles, numbness, or shooting pains, often worse with walking, standing, or at night. Tapping over the nerve behind the inner ankle bone may reproduce the tingling. It usually affects one foot. Flat feet deserve a mention as a driver, because the fallen arch stretches the nerve around the inside of the ankle.
What actually helps?
- Confirm the diagnosis: the exam and often a nerve conduction study or ultrasound confirm the nerve is the problem and find what is compressing it. Foot numbness has other causes, including back problems and diabetes, so the label matters.
- Support the arch: insoles or supportive shoes that correct flat feet take the stretch off the nerve and are the mainstay for many people.
- Calm the inflammation: ice after activity, anti-inflammatory medicines when appropriate, and a period of reduced impact exercise settle flares.
- Immobilize when severe: a boot or brace for a few weeks rests the tunnel when symptoms are acute.
- Injection or surgery for stubborn cases: a steroid injection into the tunnel can help, and surgical release of the tunnel is the option when a clear compression, like a cyst, or failed conservative treatment points that way.
When is it an emergency?
Tarsal tunnel syndrome is never an emergency, but do not sit on these: foot numbness that is spreading or constant, visible wasting of the foot muscles, or weakness catching your toes when you walk, since prolonged nerve compression causes lasting damage. New one-sided leg swelling with pain, or a foot that turns cold or discolored, is a same-day assessment for a different problem entirely. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Is tarsal tunnel syndrome the same as carpal tunnel?
Same idea, different tunnel. Carpal tunnel compresses the median nerve at the wrist, causing hand numbness; tarsal tunnel compresses the tibial nerve behind the inner ankle, causing sole-of-foot symptoms. Both are treated with a similar ladder: remove the pressure, calm the inflammation, and release the tunnel surgically when conservative treatment fails. Tarsal tunnel is considerably less common.
What causes tarsal tunnel syndrome?
Anything crowding the tunnel: flat feet stretching the nerve, swelling from ankle sprains or arthritis, varicose veins, a ganglion cyst or other growth in the tunnel, and diabetes making the nerve more vulnerable. Sometimes no clear cause emerges. Finding the driver matters because treating flat feet or removing a cyst can fix the nerve problem at its source.
How is tarsal tunnel syndrome diagnosed?
The exam comes first: symptoms mapped to the inner ankle and sole, and tingling reproduced by tapping over the nerve. Nerve conduction studies measure how well the nerve conducts and confirm the location of the problem. Ultrasound or MRI looks for a structural cause like a cyst. The workup also rules out the mimics, back problems and diabetic nerve disease chief among them.
Can tarsal tunnel go away on its own?
Mild cases linked to a temporary cause, like a sprain's swelling, can settle as the swelling does. Cases driven by flat feet or a structural problem tend to persist until the driver is addressed, and long-standing compression can become permanent. That is why persistent sole numbness or burning deserves assessment rather than endurance: earlier treatment protects the nerve.
What exercises help tarsal tunnel syndrome?
The useful ones are about support rather than stretching the nerve itself: calf stretching, foot and ankle strengthening, and exercises that build the arch-supporting muscles. A physio tailors these to your foot shape. Aggressive nerve stretching or deep massage directly over the tunnel can aggravate it, so exercise selection matters more than enthusiasm.
When is surgery needed for tarsal tunnel?
Surgery releases the tunnel by dividing the ligament roof, and it is considered when a scan shows a structural compression like a cyst, or when several months of conservative treatment, insoles, activity change, possibly a steroid injection, have not controlled symptoms. Outcomes are best when a clear compression exists. Your surgeon will weigh the nerve conduction results and imaging before recommending it.