Not all heel pain is plantar fasciitis. Tarsal tunnel syndrome — compression of the posterior tibial nerve as it passes through the tarsal tunnel in the ankle — is described in the literature as an underdiagnosed cause of heel pain and foot dysfunction.1 If months of stretching, orthotics and rest have not helped, the working diagnosis is worth revisiting rather than repeating.
What the tarsal tunnel contains
The tarsal tunnel holds the tibial nerve, the posterior tibial artery, and the tendons of tibialis posterior, flexor digitorum longus and flexor hallucis longus.1 Compression of the tibial nerve within that space produces pain, numbness, tingling and weakness along its distribution.1
Those last three symptoms are the tell. Plantar fasciitis is a tissue problem and hurts; it does not typically produce numbness, tingling or weakness. When those are present, a nerve is involved.
Why it takes so long to identify
The clinical presentation varies because of the numerous possible causes and the range of structures involved, and symptoms may develop insidiously over months to years or begin after trauma.1
More importantly, the lack of definitive clinical tests or imaging often delays diagnosis, which contributes to poor patient outcomes and lower treatment success.1 This is not a condition a scan reliably settles, which is exactly why it slips through.
Delay has a cost
In severe or long-standing cases, permanent nerve damage may occur if the condition is left untreated.1 The review is explicit that early diagnosis and intervention are key to avoiding permanent nerve injury and to getting the most from treatment, whether conservative or surgical.1
That changes the calculus on waiting. With plantar fasciitis, watchful waiting is reasonable. With a compressed nerve, time is not neutral.
How the question gets answered
Because no single test is definitive, the approach is to combine the symptom pattern with testing that measures nerve function directly. Nerve conduction studies and electromyography assess whether the tibial nerve is conducting normally, which is information no ultrasound or X-ray provides.
That testing is described under electrodiagnostic testing. Foot and ankle pain more generally is covered under foot pain, and where a nerve is entrapped in scar or adjacent tissue, hydrodissection is among the options discussed. Where diabetes is part of the picture, diabetes and neuropathy is the relevant page.
Frequently asked questions
How do I know my heel pain is not plantar fasciitis?
Numbness, tingling or weakness alongside the pain suggests nerve involvement rather than a fascia problem, since tarsal tunnel syndrome compresses the tibial nerve. See foot pain.
Why has no scan shown anything?
Because there is a recognized lack of definitive clinical tests or imaging for this condition, which is one of the main reasons diagnosis is delayed. Nerve function has to be measured rather than pictured — see electrodiagnostic testing.
Can it come on without an injury?
Yes. Symptoms may develop insidiously over months to years, or begin after trauma. Either pattern is consistent with the diagnosis. Evaluation is described on the pain treatments page.
Is it safe to keep waiting to see if it settles?
Not indefinitely. In severe or long-standing cases permanent nerve damage can occur if untreated, and early intervention is described as key to avoiding permanent nerve injury. Arrange an assessment through the appointment request form.
Does this have anything to do with diabetes?
It can, since nerve vulnerability and neuropathy alter the picture and the treatment plan. See diabetes and neuropathy.
To have persistent heel pain evaluated, request an appointment, call (314) 481-5000, or text (314) 886-5902.
Sources
- Sha I I. Tarsal Tunnel Syndrome — A Comprehensive Review. The Iowa Orthopaedic Journal. 2024;44(2):32–36. Retrieved via PubMed. PMC11726481
Dr. Gurpreet Singh Padda, MD, MBA, MHP
