Tarsal Tunnel Syndrome: Tingling Near the Ankle
A buzzing, burning or pins-and-needles feeling along the inside of the ankle and into the sole is easy to blame on a sock, a shoe or a long day. Sometimes the cause sits behind the ankle bone, where a nerve runs through a tight space.
It can show up in the quiet after the shoes come off. You sit on the edge of the bed, and along the inside of one ankle there's a warm, prickling buzz that runs down into the heel and the sole. A few minutes later it's gone, and the sock gets blamed, then the shoe, then the floor at work.
From the outside there's often little to see. There's just a feeling on its own schedule, hard to describe and hard to place, whether it's the heel, the arch, the toes or the ankle itself. It can leave you wondering if it deserves a closer look.
The short answer
Tarsal tunnel syndrome is pressure on the tibial nerve as it passes through a narrow channel behind the bony bump on the inside of the ankle. It can cause tingling, burning, numbness or sharp, shooting pain on the inner ankle, in the heel, along the sole or in the toes, often worse after standing or walking. A past ankle injury, swelling, foot shape and a growth pressing on the nerve are linked to it, though sometimes no cause is found.
Day to day, people commonly rest from whatever brings the feeling on, return gradually, choose roomy shoes that don't press on the inner ankle, and jot down when it happens. A healthcare professional can tell what is going on. A visit is worth it when the feeling keeps returning, shows up at night or at rest, spreads, or comes with weakness.
What the tarsal tunnel is
The tarsal tunnel is a narrow passage on the inside of the ankle, behind the bony bump you can feel there. Bone forms one side of it and a strong band of tissue the other. Through the space run tendons, a small artery and vein, and the tibial nerve, the main nerve that carries feeling and movement signals between the lower leg and the foot.
Near the ankle the nerve divides into branches that carry feeling from the sole and toes. That's why trouble in the tunnel is often felt in the sole and toes, away from the squeeze itself. Where space is so tight, pressure can scramble the nerve's signals, which people notice as tingling, burning or numbness. The setup is often compared to carpal tunnel syndrome in the wrist, though the ankle version is described as less common.
What people notice
People describe tingling, burning, numbness or pins and needles on the inside of the ankle, in the heel, along the sole or in the toes. Some describe sharp, shooting or electric-like pain. Pressing or tapping behind the ankle bone can bring it on, which is one reason a professional may do just that.
The pattern matters as much as the sensation. The feeling tends to build with standing, walking or other activity and to quiet down with rest, though some people notice it at night or at rest too. A foot that tingles after you've sat on it, as explained in why your foot falls asleep, settles within minutes, while this kind tends to return in the same place.
This condition can be mistaken for heel pain. Heel pain from other causes tends to be sharpest with the first steps of the day and doesn't usually come with tingling. In more advanced cases the small muscles that move the toes, which the nerve also supplies, can weaken, so the foot may feel clumsy.
Why the nerve gets squeezed
Anything that narrows the tunnel, or swells the tissue inside it, can add pressure on the nerve. A past ankle sprain or break is a familiar part of the story, since injuries bring swelling, and a good share of people with this condition have an ankle injury in their history. Growths can crowd the space too, such as a fluid-filled ganglion cyst, a bone spur or an enlarged vein.
Foot shape is linked to it, both flat feet and high arches. With flat feet, the idea is that the heel tilts inward and strains the nerve. Some long-term health conditions, among them diabetes and an underactive thyroid, are linked as well, probably because they can damage nerves or cause swelling around them. Frequent, strenuous exercise is linked to it, and shoes that fit poorly may add pressure from the outside. Often no single cause is found, and why one person develops it and another doesn't isn't fully understood.
Everyday habits for a tingling inner ankle
These habits take a minute or two each and need only a notebook, a chair and shoes you already own. Go gently, stop whatever makes the feeling stronger, and if you're recovering from an injury or surgery, check with a healthcare professional beforehand.
Keep a short note
Over several days, jot down when the feeling shows up: which shoes you wore, how long you'd been on your feet, the time of day and where in the foot it appeared. Bring the note, and the shoes you wear most, to an appointment.
Check where shoes press
Look at where the collar, a strap or the laces cross the inside of your ankle. A deep mark there is a reason to loosen the lacing or try another pair.
Choose roomy, steady shoes
On long days, many people reach for shoes with room around the ankle and toes and a firm, steady base.
Break up long stretches
Sit for a few minutes between long spells of standing or walking, with the foot resting flat.
Ease back, then return gradually
If one activity brings the feeling on, many people cut back for a while and return in small steps. Stop anything that makes it stronger.
Fit is a common place to start, since the collar, tongue and laces all sit near the inner ankle, and how to lace shoes for long shifts shows how to leave a window in the laces over a pressure spot. A general routine for gentle ankle movement is in ankle exercises for steadier feet, but with tingling in the ankle, ask a healthcare professional which moves suit you. How much any of this changes the feeling varies with the person and the cause.
What a healthcare professional may do
A visit usually starts with questions about where the feeling sits, when it comes, what seems to set it off and what has happened to the ankle before. The professional may look at the shape and movement of the foot, and press or tap along the nerve behind the ankle bone. No single test settles it, so the picture is built from your story, the exam and sometimes more.
Nerve tests measure how well signals travel along the nerve, and they can add information. They don't always show a problem even when one is there. Imaging, such as an ultrasound or an MRI scan, can show what's inside the tunnel, including a cyst, a lump or an enlarged vein.
From there the professional can talk through options. These may include rest and changes to activity, supportive footwear, custom-made inserts, a brace and a cast or splint for a time. An injection near the nerve may come up too and, for some people whose signs haven't improved with other care, surgery to give the nerve more room. Which suits a foot depends on the cause, and results vary. Pressure on a nerve for a long time can lead to lasting changes, so it's better to ask than to wait.
When tingling near the ankle may mean something more
A brief buzz after sitting on your foot, or after a day in shoes that pinched, is part of ordinary life. A feeling that follows an obvious cause and fades within minutes of moving rarely needs more than a change of position.
Pay closer attention when the pattern changes. Tingling, burning or numbness that keeps returning to the same place, shows up at night or at rest, spreads or reaches both feet deserves a closer look. So does any weakness, a foot that catches or drags, or a lump or swelling near the inner ankle. Many things can affect nerves, diabetes among them.
Questions people ask
Can tarsal tunnel syndrome affect both feet?
It can. It's often described in one foot, but both can be involved. Tingling or numbness in both feet has other possible causes too, including nerve changes linked to diabetes, so it's worth mentioning to a healthcare professional, who can tell what is going on.
Should I keep walking or exercising if my inner ankle tingles?
Cutting back on whatever brings the feeling on is the usual suggestion, and many people return in small steps. Stop anything that makes the tingling or burning stronger. A healthcare professional can say how much activity suits you, since it depends on the cause.
Do people use insoles or a brace for tarsal tunnel syndrome?
A professional may talk through custom-made inserts or a brace, mostly when foot shape such as flat feet seems part of the picture. The idea is to limit inward rolling of the foot, a movement that can strain the nerve. Which kind, if any, suits a foot depends on the cause.
The bottom line
Tarsal tunnel syndrome is a reminder that the place a feeling shows up isn't always the place it starts. A nerve squeezed behind the ankle can send its message all the way to the toes, and the more clearly that message is described, the easier it is to trace back. When it comes, where it travels and what the day looked like around it are small details that make the story much easier to follow.
