Tarsal tunnel syndrome: a real diagnosis, and a label that gets stretched over a lot of unexplained foot pain.

Burning, tingling, aching in the sole and ankle. Sometimes a nerve is pinched. Often the tests say it is not, and that changes everything.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What tarsal tunnel syndrome is

On the inner side of the ankle, just behind and below the bony bump (the medial malleolus), a band of tissue forms a tunnel. Through it run the tibial nerve, its blood vessels and several tendons. The nerve then splits into branches that supply sensation to the sole and power to the small muscles of the foot. Tarsal tunnel syndrome is the name for compression or irritation of the tibial nerve in that tunnel. The analogy to carpal tunnel syndrome at the wrist is exact, though the foot version is far less common.

Genuine tarsal tunnel syndrome has recognisable features: burning, tingling, electric or shooting pain along the sole and sometimes the heel, numbness in the nerve's territory, often worse with prolonged standing or at night, and sometimes a tingling jolt when the tunnel is tapped. It can be caused by something occupying the tunnel: a ganglion cyst, a varicose vein, a bone spur, swelling after an ankle injury, or by flat feet that stretch the nerve.

The neuroplastic contribution

Neuroplastic symptoms are real symptoms generated by learned pathways in the brain and nervous system rather than by ongoing damage or compression in the body. Burning, tingling and numbness feel like nerve symptoms because they are produced by the nervous system, but the nervous system can produce them centrally, from a sensitized brain and spinal cord, without any nerve being pinched. The sensations are real. They are not imaginary and not 'all in your head' in any dismissive sense.

The ATNS Index of Neuroplastic Symptoms makes a distinction here that is worth reading carefully. Nerve compression in the tarsal tunnel does occur, and a detailed examination and nerve testing may confirm it. But the index observes that some clinicians attribute a vague type of foot pain to this condition when it is more likely due to neuroplastic symptoms. Its rule follows directly: if nerve compression is not confirmed, an assessment for neuroplastic symptoms should be done.

What a 'vague' foot pain looks like compared with a compressed nerve:

• Pain that does not follow the tibial nerve's territory, or that moves around the foot, ankle and lower leg.
• Normal nerve conduction studies and no mass or swelling in the tunnel on imaging.
• Pain that flares with stress, fatigue or worry rather than with standing or walking.

Our guide to nociceptive, neuropathic and nociplastic pain explains why nerve-like symptoms do not always mean nerve damage, and the central sensitization guide covers the mechanism.

What the research shows

The diagnostic research on tarsal tunnel syndrome explains why the label gets stretched. A 2025 systematic review examined how the condition is diagnosed across the literature and found that reported sensitivity of tests varied widely, largely because there is no robust reference standard for the diagnosis. The authors called for standardisation.

A comprehensive review of the condition reports that standard nerve conduction studies have a sensitivity of roughly 50 to 82 percent and a specificity of 80 to 90 percent. A prospective study from India of motor nerve conduction in suspected idiopathic tarsal tunnel syndrome found a sensitivity of 80 percent but a specificity of only 33 percent, meaning the test flagged many people who did not have the condition; the authors concluded it works as a screening tool rather than a confirmatory one.

Taken together, confirming tarsal tunnel syndrome needs converging evidence: the right symptom pattern, examination findings, abnormal nerve testing and often imaging showing a cause. When that convergence is absent, the ATNS index's advice applies.

Direct research on the nervous system's role is thin, but one study points the same way. A case-control study found tarsal tunnel syndrome more often in people with fibromyalgia than in healthy controls, and the authors suggested that central sensitization may make nerves at entrapment sites more sensitive. In other words, a sensitized system can turn up foot nerve symptoms, which is the contribution the index asks clinicians to consider.

Signs the brain may be part of the picture

• Nerve conduction studies are normal, or were never done, and imaging shows nothing in the tunnel.
• Pain does not stay in the sole and heel but spreads up the leg or across the whole foot.

A solution that addresses it

When compression is not confirmed, pain and symptom reprocessing is the approach built for pain the nervous system is generating on its own. It combines education about neuroplastic pain, somatic tracking (attending to the burning or tingling with curiosity rather than dread), reducing fear and the sense of threat, a graded return to standing, walking and footwear you have been avoiding, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver it, and digital programs are making it more accessible.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If your foot pain has a nerve name but no confirmed nerve problem, you can join the waitlist.

What to do next

1. Get a proper nerve assessment. Ask for a detailed examination and nerve conduction studies, compared with the other foot, and imaging of the tunnel if compression is suspected. Sudden foot weakness, a foot that drops when walking, rapidly spreading numbness, or a cold, pale or swollen foot need prompt medical attention.
2. If compression is not confirmed, ask the question. 'Could my nervous system be producing this pain without a trapped nerve?' The ATNS index says that is the assessment to make.
3. Start retraining. Learn that hurt is not harm, reduce guarding, and return to normal walking and standing in steps.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.