Plantar fasciitis: why heel pain can outlast the injury.

Overuse can inflame the foot for a few weeks. When pain lasts a year, the tissue has usually settled and the nervous system has not.

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 plantar fasciitis is

Plantar fasciitis is the most common cause of heel pain. The classic picture is sharp pain under the heel with the first steps in the morning or after sitting, easing with movement and returning after a long day on your feet. It is linked to sudden increases in running or standing, tight calves, and changes in footwear or body weight.

The name says 'itis', meaning inflammation, and in the first days or weeks of an overuse episode some inflammation is plausible. Standard care, which includes rest, calf and fascia stretching, supportive shoes, and time, resolves most cases within a few months.

Yet a stubborn minority go on for a year or more, through injections, orthotics, night splints, shockwave and sometimes surgery. For these people the question changes: if the tissue is no longer inflamed, what is keeping the pain going?

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms acknowledges debate about this condition. It notes that acute, short-term inflammation can occur from overuse, but that there is little evidence for chronic inflammation of the foot's ligaments causing chronic pain. Its conclusion: when pain on the bottom of the foot does not resolve with usual treatment for an acute injury or overuse syndrome, assessment for neuroplastic symptoms should be done. A second index entry adds that plantar fasciitis is not caused by neuroplastic symptoms, but that atypical symptoms, an unusual course, or a poor response to treatment are reasons to assess.

Neuroplastic symptoms are real symptoms produced by learned pathways in the brain and nervous system, a sensitized alarm system, rather than by ongoing damage in the body. They are not imaginary and not 'all in your head'. Because the brain can change, they are reversible.

How does heel pain become neuroplastic?

• An initial episode of real tissue irritation teaches the nervous system that this heel is dangerous. Over time the pain pathway becomes sensitized and keeps firing after healing, which is central sensitization.
• Fear of the first morning steps, limping and avoiding walking all reinforce the brain's prediction that weight-bearing hurts, a fear-avoidance cycle.
• Stress, poor sleep and frustration with a pain that 'should have healed' keep the alarm system on high.

What the research shows

The first piece of evidence is about the tissue itself. A histological study examined fascia samples from 50 people who had surgery for chronic plantar fasciitis. It found myxoid degeneration and fragmentation of the fascia with no inflammatory cells, and the authors proposed renaming the condition 'plantar fasciosis'. Chronic heel pain, in other words, is not an ongoing inflammatory fire.

That fits with a meta-analysis of randomised trials comparing corticosteroid injections with placebo. Steroid injections, which work by reducing inflammation, gave only modest short-term relief and no lasting advantage, which is what you would expect if inflammation is not the driver of long-term pain.

The second piece is about the nervous system. A 2025 cross-sectional study compared 106 people with plantar fasciitis to 100 controls and found that central sensitization and nociplastic pain features were common, especially in chronic cases. The authors suggested that pain which persists or fails to respond to treatment shifts towards central sensitization over time. The study is associational, so it cannot prove cause, but it shows that in chronic plantar fasciitis the pain system itself has changed.

The gap between these two literatures, degenerated tissue on one hand and a sensitized nervous system on the other, is exactly where the ATNS index places its advice.

Signs the brain may be part of the picture

• Heel pain has lasted well beyond the usual recovery window despite sensible treatment.
• Pain has spread: to the arch, the other heel, the ankle or the calf.
• Pain varies with stress, mood and sleep more than with how much you walked.
• Pain is present at rest or at night, not only with weight-bearing.
• Injections, orthotics and shockwave each helped briefly, then the pain returned.
• You dread the first steps of the day and have been limping or avoiding activity for months.
• You have other sensitivity-related conditions such as migraine, IBS or widespread pain.

A solution that addresses it

For heel pain that has outlasted its injury, the target has to include the nervous system. Pain and symptom reprocessing approaches do this with education about neuroplastic symptoms, somatic tracking (attending to heel sensations with curiosity instead of dread), reducing threat, graded return to walking and running, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver these approaches, and digital programs increasingly bring them home. Understanding that hurt is not harm and rebuilding activity with pacing rather than rest are core pieces.

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 heel has been hurting far too long, you can join the waitlist.

What to do next

Get the foot examined. A clinician can confirm plantar fasciitis and rule out stress fractures, nerve entrapment, inflammatory arthritis and, rarely, infection or tumour. Heel pain with fever, redness, swelling, numbness, or after a fall needs prompt assessment. Follow the standard acute care plan for a reasonable period.

If months pass and the pain is not behaving like a healing injury, ask whether it fits a neuroplastic pattern. If it might, shift from protecting the foot to retraining the system: walk a little more each week, work on fear rather than only on the fascia, and learn the skills that calm a sensitized nervous system. Related guides: tendonitis and shin splints follow the same logic.

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.