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Educational illustration of a foot with the plantar fascia band highlighted from heel to forefoot

What Is Plantar Fasciitis?

By SoleBrace Read time 4 min

Plantar fasciitis is a common source of pain under the heel. Learn what the plantar fascia does, how the pattern usually feels, and what should prompt an individual assessment.

The basics

Plantar fasciitis describes irritation and pain involving the plantar fascia: the strong band of tissue that runs along the bottom of the foot from heel toward toes. It is a common pattern of heel pain, but heel pain has more than one possible cause, so a diagnosis should not be made from a webpage alone.

What the plantar fascia does

The plantar fascia helps support the arch and transfers load as you stand and walk. It is not a muscle. It is a connective tissue band, which is why a change in standing hours, walking, footwear or work surface can sometimes make the underside of the heel feel sensitive. The American Academy of Orthopaedic Surgeons’ overview explains the condition and its common presentation.

How the pattern often feels

A familiar pattern is pain under or just in front of the heel that is sharpest with the first steps after sleep or a period of sitting, then eases a little as you move. It can return after a long day on hard floors. That pattern can be useful context, but it does not prove the cause.

  • Location: often underneath the heel rather than at the back of it.
  • Timing: commonly after rest, then after prolonged loading.
  • Change: symptoms that are worsening, spreading, or changing the way you walk need attention.

Do not self-diagnose every heel pain

Numbness, marked swelling, redness, fever, a sudden injury, inability to bear weight or pain that keeps worsening need prompt medical advice. Other problems can look similar at first.

Educational illustration showing the plantar fascia along the underside of a foot
The plantar fascia runs from the heel toward the toes. Pain under the heel can have several causes, so a persistent pattern is worth assessing.

What can contribute

There is rarely one single cause. A sudden increase in walking or standing, long shifts on concrete, a change in footwear, tight calves, or a shoe that is worn through can all add load to the same area. The NHS guidance on plantar fasciitis recommends looking at the overall pattern, not simply blaming one item of footwear.

For work footwear, inspect the whole setup: the shoe should hold the heel securely, have enough depth for the liner, and not be leaning or broken down. If the liner is compressed or uneven, read how long insoles last before changing it.

What to do next

Start with a calm, repeatable plan rather than trying to force your way through growing pain. Reduce the activity that reliably flares symptoms where practical, keep moving within comfort, and choose stable footwear that fits without pressure points. For a practical, workday-focused approach, see how to fix plantar fasciitis.

When to get assessed

Arrange an assessment if pain is persistent, severe, recurrent, affecting sleep, changing how you walk, or not improving with sensible load and footwear changes. A clinician can assess the cause and tailor advice to your health history and work demands.

Frequently asked questions

Is plantar fasciitis the same as a heel spur?

No. A heel spur may be present with or without pain. Plantar fasciitis refers to a pattern of pain involving tissue under the foot, and imaging findings alone do not explain every symptom.

Can plantar fasciitis cause pain in both feet?

It can affect one or both feet. A new or persistent problem in both feet is a good reason to seek an individual assessment.

Is first-step heel pain always plantar fasciitis?

No. It is a common pattern, but it is not diagnostic. Location, history and an examination help distinguish possible causes.

Can work boots contribute to heel pain?

Any footwear that is worn out, too tight, too shallow or poorly matched to the job can make a sensitive foot less comfortable. Check fit, liner condition and workload together.

Continue exploring

For more practical guidance, visit the Foot Health Guides hub or read our guide to best insoles for plantar fasciitis.