What Is Plantar Fasciitis?

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.

Signs to look for

Plantar fasciitis commonly follows a recognisable pattern, but no checklist can diagnose it. The NHS description of plantar fasciitis notes that pain is usually felt around the heel and arch. These signs are useful details to notice before deciding what to change or discussing the problem with a clinician:

• First-step pain: discomfort is sharpest when you first stand after sleeping or sitting, then eases a little once you have moved around.
• Under-heel location: the tender area is usually on the sole of the foot, close to or just in front of the heel, rather than at the back of the heel.
• Load sensitivity: symptoms build again after a long period of standing, walking, climbing stairs or working on hard floors.
• Stretch sensitivity: lifting the toes or taking the first few steps barefoot can make the underside of the foot feel tight or sore.
• A recent change: a jump in shift hours, walking volume, training, footwear, body weight or work surface came before the problem started.
• One-sided or two-sided pain: it may affect one foot or both, but a new or persistent pattern in either foot deserves attention.

These signs can fit plantar fasciitis, but they can also overlap with other causes of heel pain. Note the location, timing and what changes it, rather than assuming the label is certain.

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. Foot Health Facts’ plantar-fasciitis guide also notes that heel pain can have several possible causes, which is why an individual assessment matters when the pattern is not settling.