You've been on your feet all day — maybe hiking a foothills trail, gardening in the heat, or logging hours on a hard floor at work — and now your inner ankle burns and your sole tingles like it's half-asleep. If that burning, numb feeling keeps coming back, your tibial nerve may be caught in a tight spot. That tight spot has a name: the tarsal tunnel.
Tarsal tunnel syndrome (TTS) is one of the more frequently missed diagnoses in foot and ankle care. It can masquerade as plantar fasciitis, diabetic neuropathy, or just "tired feet" — which means many patients spend months chasing the wrong treatment. Here is what TTS actually is, how to recognize it, and what a podiatrist can do to give your nerve room to breathe again.
The tarsal tunnel is a narrow passageway on the inner side of your ankle, just behind and below the medial malleolus (the bony bump on the inside of your ankle). Its "roof" is a tough band of connective tissue called the flexor retinaculum (sometimes called the laciniate ligament). Through this tight corridor runs the posterior tibial nerve — along with blood vessels and several tendons that control toe flexion.
Think of it as the ankle's version of the carpal tunnel in the wrist. When anything increases pressure inside that space — swelling, a cyst, flat feet that collapse inward, or scar tissue from an old ankle sprain — the tibial nerve gets squeezed and starts to protest.
Symptoms stem from that compressed posterior tibial nerve and its branches, which supply sensation to the bottom of the foot. Common signs include:
Symptoms are usually one-sided — affecting just the foot where the nerve is compressed. This single-foot pattern is an important clue that separates TTS from systemic conditions that tend to affect both feet at once.
Our summers are long, hot, and active. Hours of hiking on the Ridge to Rivers trail network, standing on hard surfaces at the Western Idaho Fair, or ramping up mileage before a Greenbelt 5K can all inflame the tissues around the tarsal tunnel. Add in flat feet — a structural risk factor that tilts the ankle inward and stretches the tibial nerve — and it's easy to see why TTS shows up more in active, on-their-feet patients than most people expect.
In roughly 80% of confirmed cases a specific cause can be identified, according to research published in StatPearls (NIH/NCBI). Common culprits fall into two categories:
TTS is diagnosed primarily through clinical examination. During your visit, your podiatrist will:
Because TTS is relatively uncommon and its symptoms overlap with several other conditions, it is often underdiagnosed or misdiagnosed. Getting a precise diagnosis is exactly why seeing a foot and ankle specialist matters — the right treatment depends entirely on knowing which nerve problem you're actually dealing with. Learn more about our tarsal tunnel syndrome evaluation and treatment services.
These three conditions share overlapping symptoms, but they have different locations, patterns, and causes. A quick guide:
| Feature | Tarsal Tunnel Syndrome | Plantar Fasciitis | Diabetic Neuropathy |
|---|---|---|---|
| Primary symptom | Burning, tingling, numbness; may include pain | Sharp heel pain, especially with first steps | Bilateral burning, numbness, tingling; "stocking" pattern |
| Location | Inner ankle radiating to arch & sole; usually one foot | Bottom of heel; worse in the morning | Both feet (and often hands); ascends from toes upward |
| What makes it worse? | Prolonged standing/walking; activity | First steps after rest; standing on hard floors | Night-time; worsens over years regardless of activity |
| Key cause | Tibial nerve compression in the tunnel | Overloaded plantar fascia band | Blood-sugar damage to peripheral nerves |
| How it's confirmed | Clinical exam, Tinel's sign, MRI, nerve conduction | Clinical exam, ultrasound | Blood sugar history, nerve conduction studies |
It is also worth noting that the two nerve conditions can coexist. People with diabetes are more susceptible to localized nerve compression injuries — meaning a diabetic patient can have both peripheral neuropathy and tarsal tunnel syndrome at the same time. This "double crush" scenario is why thorough evaluation is so important for anyone with diabetes who develops new or asymmetric foot symptoms. Our diabetic foot care team watches carefully for exactly this overlap.
Treatment almost always begins conservatively, and many patients respond well without surgery.
When conservative care fails to provide lasting relief — typically after several months of diligent effort — surgical decompression may be recommended. The procedure releases the flexor retinaculum (the ligament forming the tunnel's roof) to give the tibial nerve more room. When a space-occupying lesion (like a cyst or bone spur) is present, it is removed at the same time.
Published success rates for tarsal tunnel release range from 44% to 96%, reflecting how variable outcomes can be depending on the underlying cause and how long the nerve has been compressed. Patients who do best tend to have a clearly identifiable cause, a shorter duration of symptoms, and a positive Tinel's sign before surgery. This is another reason why early diagnosis matters — the longer a nerve endures chronic compression, the harder it is to achieve complete recovery.
See a podiatrist soon if you have persistent burning, tingling, or numbness on the inner ankle or sole of one foot; symptoms that wake you at night; or symptoms that began after an ankle sprain and haven't improved. Early care gives your nerve the best chance to recover fully.
Seek urgent or emergency care if you develop sudden, severe pain and complete loss of sensation in the foot, difficulty moving the foot or toes, a rapidly spreading wound or infection, or any of these symptoms alongside fever — these can indicate a serious nerve injury or infection requiring immediate attention. People with diabetes should never wait on new foot symptoms that are changing quickly.
Tarsal tunnel syndrome is compression of the posterior tibial nerve inside the tarsal tunnel — a narrow passage behind the inner ankle bone. Compression irritates the nerve and causes pain, burning, tingling, or numbness that radiates from the ankle to the arch and sole of the foot.
Diabetic neuropathy affects both feet symmetrically in a stocking-like pattern and is driven by blood-sugar damage throughout the body. Tarsal tunnel syndrome is a localized compression of one nerve, usually affecting one foot, with symptoms centered around the inner ankle. The two can coexist — especially in people with diabetes — so evaluation by a specialist is important to sort them out.
Mild cases may settle with rest, but TTS rarely resolves fully without addressing the underlying cause of nerve compression. Without treatment, symptoms tend to persist or worsen. Conservative care started early is often very effective at relieving symptoms and preventing permanent nerve damage.
Chronic nerve compression can cause permanent nerve damage — resulting in lasting numbness, weakness in the small foot muscles, or pain that becomes difficult to treat even with surgery. People with diabetes are especially at risk for slower or incomplete nerve recovery, which is why prompt evaluation matters.
Yes. Treasure Valley Foot & Ankle is located in Meridian and serves patients across the Boise, Nampa, and Treasure Valley area. You can request an appointment online or call (208) 272-9253 to discuss your symptoms.
Burning, tingling, or numb feet are not something you should chalk up to long days or aging. When those symptoms are concentrated on the inner ankle or sole of one foot — especially after activity, or after a history of ankle sprains — tarsal tunnel syndrome deserves a spot on the diagnostic list. The good news is that with the right diagnosis and the right treatment plan, most patients see meaningful improvement without surgery.
Dr. Clark Johnson is a board-certified foot and ankle surgeon at Treasure Valley Foot & Ankle in Meridian. If you're dealing with foot numbness, tingling, or burning that won't quit, request an appointment or call (208) 272-9253. Getting the right diagnosis early is the single biggest factor in how fully your nerve can recover.
This article is for general education only and is not a substitute for professional medical evaluation or treatment. If you have new or worsening foot numbness, tingling, or pain — especially if you have diabetes, or symptoms are changing rapidly — please be evaluated in person.
Get a clear diagnosis and a plan — before nerve compression has time to become a bigger problem.