You can’t get carpal tunnel syndrome in your legs, because the carpal tunnel is a specific structure in your wrist. But your legs have a nearly identical condition called tarsal tunnel syndrome, which involves the same type of nerve compression in your ankle. The tarsal tunnel sits just behind and below the bony bump on the inside of your ankle, and when the nerve running through it gets squeezed, you feel many of the same symptoms people describe with carpal tunnel: numbness, tingling, burning, and pain.
What the Tarsal Tunnel Actually Is
The tarsal tunnel is a narrow channel formed by bone and a band of tough tissue on the inner side of your ankle. Running through it are several tendons, a blood vessel, and the posterior tibial nerve, which carries sensation from the sole of your foot and toes. When something compresses that nerve inside the tunnel, you develop tarsal tunnel syndrome.
The parallel to carpal tunnel syndrome is remarkably close. In your wrist, the median nerve passes through a bony channel and gets pinched. In your ankle, the posterior tibial nerve passes through an almost identical setup. Research has found the connection goes beyond anatomy: people with carpal tunnel syndrome are more likely to also have a narrow tarsal tunnel, and vice versa. In one study, about 15% of patients with carpal tunnel also showed signs of tibial nerve compression at the ankle, suggesting some people are simply built with tighter nerve tunnels throughout their body.
Symptoms to Watch For
The hallmark of tarsal tunnel syndrome is pain, tingling, or burning along the inside of the ankle that radiates into the arch and bottom of the foot. Some people feel it in their toes. The sensations are often described as sharp and shooting, similar to what carpal tunnel patients feel in their fingers.
Other common symptoms include:
- Numbness on the sole of the foot, sometimes patchy
- Burning or tingling that worsens at night and can disrupt sleep
- Weakness in the small muscles that move your toes
- Pain that radiates upward into the calf, which sometimes makes it hard to pin down exactly where the problem is
In chronic cases that go untreated for a long time, the muscles in the foot can visibly shrink and the toes may start to curl or contract. The symptoms tend to be vague early on, which is one reason tarsal tunnel syndrome often gets missed or confused with other foot problems like plantar fasciitis.
Common Causes and Risk Factors
Anything that takes up space inside the tarsal tunnel or changes the shape of your ankle can compress the nerve. Flat feet (pes planus) are one of the most common culprits, because the arch collapse pulls the nerve taut and increases pressure inside the tunnel. Other structural issues like ankle deformities or bone coalitions can do the same thing.
Injuries matter too. A fractured ankle, surgical scarring, or chronic swelling from a sprain can all narrow the tunnel. Some people develop cysts, varicose veins, or even small benign growths inside the tunnel that press on the nerve.
Systemic conditions play a significant role. Diabetes is a major risk factor because it causes nerve inflammation on its own, making the tibial nerve more vulnerable to compression. In fact, tarsal tunnel syndrome can be masked by diabetic nerve pain, making it harder to diagnose. Rheumatoid arthritis and peripheral artery disease also increase the risk.
How It’s Diagnosed
A doctor will typically start with a physical exam, pressing along the inside of your ankle to see if tapping on the nerve reproduces your symptoms. This is called a Tinel’s sign, the same test used at the wrist for carpal tunnel. If tapping over the tarsal tunnel sends a jolt of tingling into your foot, that’s a strong clue.
Nerve conduction studies and electromyography (EMG) are the most reliable tools for confirming the diagnosis. These tests measure how quickly electrical signals travel through the tibial nerve and whether the muscles in your foot are responding normally. They can also pinpoint exactly where along the nerve the compression is happening, which helps distinguish tarsal tunnel syndrome from other conditions that cause similar symptoms, like a pinched nerve in your lower back or compartment syndrome in the lower leg.
Other Nerve Problems in the Leg
Tarsal tunnel syndrome isn’t the only nerve entrapment that can cause tingling and numbness in the lower extremity. The peroneal nerve, which wraps around the outside of your knee, can get compressed and cause numbness or foot drop on the top of the foot. There’s also anterior tarsal tunnel syndrome, a separate condition where a nerve on the top of the foot gets trapped under a band of tissue near the front of the ankle.
A herniated disc in the lower spine can send radiating pain and numbness all the way down the leg into the foot, mimicking a local nerve problem. This is why the nerve conduction testing matters. It helps your doctor tell the difference between a problem at the ankle and a problem higher up in the nerve chain.
Treatment Options
Most people start with conservative treatment. Custom orthotics are one of the first-line approaches, especially if flat feet or an ankle deformity is contributing to the compression. The goal is to change the alignment of your foot enough to take pressure off the nerve. Semi-rigid orthotics molded to your foot in a neutral position are typically used, sometimes with a built-in metatarsal pad for additional support.
Beyond orthotics, treatment can include taping or bracing the ankle, icing, anti-inflammatory medications, and corticosteroid injections to reduce swelling inside the tunnel. Manual therapy techniques like soft tissue mobilization and joint adjustments have also shown benefit in individual cases. Stretching and strengthening exercises for the foot and ankle round out most conservative plans.
If several months of conservative care don’t bring relief, surgery to release the tarsal tunnel is an option. The procedure involves cutting the band of tissue that forms the roof of the tunnel to give the nerve more room. Success rates vary widely, from 44% to 96% depending on the study and how success is measured. One study found that 68% of patients were satisfied with their surgical outcome, 22% found the results acceptable, and 10% were dissatisfied. The wide range partly reflects how tricky diagnosis can be. Patients whose nerve compression is clearly confirmed on testing before surgery tend to do better than those with vague or unclear findings.
How It Compares to Carpal Tunnel
The two conditions are mirror images in many ways: same mechanism (nerve compressed in a tight tunnel), similar symptoms (numbness, tingling, pain, weakness), and overlapping risk factors. But there are practical differences. Carpal tunnel syndrome is far more common, partly because repetitive hand use is so prevalent in modern work. Tarsal tunnel syndrome is diagnosed less often and can be harder to identify because foot pain has so many possible causes.
Recovery from tarsal tunnel surgery also tends to be less predictable than carpal tunnel release, which has success rates consistently above 90%. The foot bears your full body weight with every step, which complicates both the compression and the healing process. Early diagnosis gives you the best chance of a good outcome, whether you pursue conservative treatment or eventually need surgery.