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Plantar fascia

The tough sheet along the sole that holds the arch up, and the usual source of first-step-in-the-morning heel pain.

Latin name: Aponeurosis plantaris. In plain English, the thick band along the sole of the foot. It is filed here under joints, tendons and fascia.

Reference information, not a diagnosis. Where a symptom is described below, it is there so you can describe your own more precisely to a clinician — not so you can name what you have.

Where it is

The plantar fascia runs from a small tubercle on the underside of the heel bone forward along the sole, fanning into five bands that reach the bases of the toes. It is thickest in the middle and it is not a passive strap: it is under tension whenever weight is on the foot, and its tension changes with the position of the toes.

Beneath it lie the small intrinsic muscles of the foot, and above it the arch it supports. The point where it attaches to the heel bone is where most plantar heel pain is felt, and it is easily located because it is exquisitely tender to press in people who have it.

What it does

It maintains the arch under load and converts the foot from a flexible shock absorber at landing into a rigid lever at push-off. That conversion is the windlass mechanism: as the toes extend at the end of stance, the fascia is drawn around the heads of the metatarsals like a cable around a drum, shortening its effective length and raising the arch.

Plantar heel pain is one of the most common foot complaints in adults. The classic pattern is sharp pain under the heel with the first steps in the morning or after sitting, easing after a few minutes and returning after prolonged standing. Despite the traditional name, the tissue changes are degenerative rather than primarily inflammatory, which is why the term plantar fasciopathy is increasingly used.

Movements that load it

The fascia is loaded at every step, and more so at speed and on hard surfaces. Loading programmes that stress it with the toes extended — for example heel raises performed with a towel under the toes — are used in rehabilitation because they load the fascia specifically through the windlass position. Calf strength matters too, since a stiff or weak calf changes how the foot loads.

Keeping its range

Two stretches are standard: pulling the toes back to tension the fascia directly, and a calf stretch against a wall, since calf tightness increases the load through the arch. Rolling the sole over a ball can ease symptoms. None of these is a substitute for managing how much and how hard you are walking or running.

When it goes wrong

Heel pain that worsens steadily despite reducing load, that is present at rest or at night, or that follows a specific injury should be assessed. Numbness or tingling in the sole suggests a nerve problem rather than the fascia.

Nothing on this page is a treatment plan. If a problem is limiting what you do, is not improving, or is getting worse, the right next step is an assessment by a doctor or a physiotherapist who can examine you.

Sources: descriptive anatomy from Gray's Anatomy of the Human Body, 20th US edition (1918), which is in the public domain; Latin names follow Terminologia Anatomica, published by the Federative International Programme for Anatomical Terminology. Nerve root levels are the conventional ranges taught from those sources and vary between individuals and between textbooks. Exercise cross-links use the TempoLife exercise library. Checked 2026-09-06.

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