Tarsal tunnel syndrome causes pain along the inside of the ankle and the bottom of the foot, often radiating into the toes. The specific location depends on which branch of the nerve is compressed, but most people feel burning, tingling, or numbness that starts near the inner ankle bone and spreads toward the heel, arch, or sole.
Where the Pain Starts
The tarsal tunnel is a narrow passageway on the inner side of your ankle, just behind and below the bony bump you can feel there (the medial malleolus). It’s formed by bone on one side and a band of tough tissue called the flexor retinaculum on the other. Running through this tunnel is the posterior tibial nerve, along with tendons and blood vessels. When something presses on that nerve inside the tunnel, the result is tarsal tunnel syndrome.
The first place most people notice pain is right at the tunnel itself: the inner ankle, slightly behind and below that bony bump. Tapping this spot often reproduces the symptoms, which is one way clinicians test for the condition.
Where the Pain Spreads
Inside the tarsal tunnel, the tibial nerve splits into three branches, and each one serves a different area of the foot. Which branch is compressed determines where you feel symptoms.
- Medial calcaneal nerve: Supplies the bottom and back of the heel. Compression here causes heel pain that can easily be confused with other conditions.
- Medial plantar nerve: Covers the inner part of the sole and the first three toes. Pain, tingling, or numbness along the inside of your arch and toward your big toe suggests this branch is involved.
- Lateral plantar nerve: Serves the outer part of the sole, the smaller toes, and the small muscles of the foot. Symptoms here show up along the outer sole and the fourth and fifth toes.
Some people have compression affecting only one branch, so their pain stays in one zone. Others feel it across the entire sole because the nerve is pinched before it divides. Pain that radiates from the inner ankle down into the arch and toes is a hallmark pattern.
What the Pain Feels Like
Tarsal tunnel pain is nerve pain, which feels distinctly different from a muscle strain or joint ache. People commonly describe it as burning, tingling, or a sensation of pins and needles across the sole of the foot. Some feel sharp, electric-shock-like jolts that shoot from the ankle into the foot. Numbness is also common, sometimes alternating with the burning sensations.
The symptoms tend to get worse with activity. Prolonged standing, walking, or any position that puts pressure on the inner ankle can ramp up the pain. Many people also notice that symptoms flare at night or after a long day on their feet. Rest typically brings some relief, though in more advanced cases the numbness or tingling can become constant.
Tarsal Tunnel vs. Plantar Fasciitis
Because both conditions cause pain on the bottom of the foot, they’re frequently confused. The key difference is the type of sensation. Plantar fasciitis produces a sharp, stabbing pain concentrated at the heel, especially with the first steps in the morning. It’s a tissue injury, not a nerve problem, so you won’t feel tingling, burning, or numbness.
Tarsal tunnel syndrome, by contrast, produces those nerve-specific sensations: burning, tingling, or electric feelings that can spread across the sole and into the toes. Plantar fasciitis pain stays near the heel. Tarsal tunnel pain typically starts at the inner ankle and fans outward. If your foot pain comes with any numbness or a “pins and needles” quality, that points toward a nerve issue rather than plantar fasciitis.
What Causes the Compression
Anything that takes up space inside the tarsal tunnel or puts extra pressure on the tibial nerve can trigger the syndrome. About 20% of cases involve varicose veins of the posterior tibial vein swelling inside the tunnel. Ganglion cysts, lipomas, and bone spurs are other common culprits that physically crowd the nerve. Tendon inflammation from overuse can also narrow the available space.
Ankle injuries like sprains or fractures sometimes cause swelling or scar tissue that compresses the nerve. Systemic conditions, including diabetes, hypothyroidism, and arthritis, can make the nerve more vulnerable to compression. Interestingly, despite what many people assume, flat feet are not directly linked to developing tarsal tunnel syndrome.
How It’s Diagnosed
The most common physical test involves tapping on the tarsal tunnel area behind the inner ankle. If this reproduces your tingling or shooting pain into the foot, it’s considered a positive sign. This test (known as Tinel’s sign) is used in roughly 89% of clinical evaluations for tarsal tunnel syndrome, with a median sensitivity of about 79%. That means it catches most cases, but a negative result doesn’t completely rule it out. Nerve conduction studies and ultrasound can help confirm the diagnosis when the physical exam is inconclusive.
Treatment and Recovery Timeline
Most people start with conservative treatment: rest, anti-inflammatory medications, arch supports or orthotic insoles, and stretching exercises. Corticosteroid injections near the tunnel can reduce inflammation and relieve pressure on the nerve. In one study, all 28 patients who followed a structured six-week program of stretching, strengthening exercises, and medial arch supports showed improvement in both pain and range of motion. Other options include heel pads, night splints, and shock wave therapy.
When conservative treatment doesn’t provide enough relief, surgical release of the tarsal tunnel is the next step. The procedure involves opening the flexor retinaculum to give the nerve more room. Success rates for decompression surgery range from 44% to 96% depending on the study, with one review of 81 patients finding that about 77% achieved excellent results and another 14% had good outcomes.
Recovery after surgery is not immediate. Most patients see little change in the first six months, with meaningful improvement building between months 6 and 12 and continuing up to 18 months. People who had symptoms for a shorter time before surgery tend to do better: those with excellent outcomes had symptoms for an average of about 23 months before the procedure, while those with poor outcomes had been symptomatic for an average of nearly 80 months. Early treatment matters.