What Causes Heel Pain?

That first sharp step out of bed often tells you something is wrong before the day has properly started. If you are asking what causes heel pain, the answer is not always as simple as “plantar fasciitis”. Heel pain can come from several different structures in the foot and ankle, and the pattern of pain matters just as much as the location.

For some people, the pain sits under the heel and eases once they get moving. For others, it builds during a run, appears at the back of the heel, or lingers after a change in footwear, workload or activity. Getting the diagnosis right matters, because treatments that help one cause of heel pain can be unhelpful, or even aggravating, for another.

What causes heel pain in adults?

Heel pain is usually caused by irritation, overload, compression or inflammation affecting the tissues around the heel. The most common source is the plantar fascia, a strong band of tissue running along the sole of the foot, but it is far from the only possibility. Tendons, bursae, nerves, fat pad tissue, bone and joints can all contribute.

In practice, the cause often relates to load. That might mean a sudden increase in walking, standing, running or sport. It can also mean a more gradual mismatch between what the tissues can tolerate and what they are being asked to do each day. Sometimes there is a single trigger, such as a change in training or a return to exercise after time off. In other cases, it develops without one obvious event.

Age, weight, foot shape, calf tightness, ankle stiffness, previous injury and footwear can all influence risk. Even so, those factors do not diagnose the problem on their own. They simply help explain why one person develops symptoms and another does not.

The most common causes of heel pain

Plantar fasciitis

Plantar fasciitis is one of the most frequent causes of pain under the heel. It tends to cause soreness at the bottom of the heel, often slightly towards the inner side. Many patients describe pain with the first few steps in the morning or after sitting, with some easing as they warm up.

Despite the name, the issue is not always a straightforward inflammatory problem. In many cases it reflects overload and degeneration within the fascia rather than classic inflammation alone. That distinction matters because management usually needs to focus on reducing aggravation, improving tissue capacity and addressing the mechanical factors that keep it going.

Heel fat pad syndrome

Not all pain under the heel is plantar fasciitis. The heel has a natural fat pad that cushions impact. If that tissue becomes irritated, thinned or bruised, pain is often felt more centrally under the heel. Patients may describe it as a deep ache or bruise-like discomfort, especially on hard floors or after long periods of standing.

This can be easy to confuse with plantar fasciitis, but the behaviour is often different. Fat pad pain may not have the same classic first-step pattern, and cushioning strategies can be more important than stretching-based approaches.

Achilles tendinopathy

Pain at the back of the heel often points towards the Achilles tendon rather than the plantar fascia. Achilles tendinopathy can occur where the tendon inserts into the heel bone or slightly higher up. It is common in runners, walkers and people who have recently increased activity.

Symptoms often include stiffness in the morning, tenderness at the back of the heel and pain during or after exercise. In insertional Achilles problems, shoes with a firm heel counter may also irritate the area. Treatment depends on the exact site and severity, because the loading advice for insertional pain differs from that used for mid-portion tendon pain.

Retrocalcaneal bursitis and posterior heel irritation

There are small fluid-filled sacs called bursae around the heel that help reduce friction. When one becomes irritated, particularly behind the heel, it can cause swelling and pain with shoes or activity. This sometimes occurs alongside insertional Achilles tendon problems and may not exist in isolation.

At the back of the heel, a bony prominence can also contribute by increasing pressure on nearby soft tissue. This is why a careful assessment is important. What appears to be one problem may actually be two or three structures reacting together.

Nerve irritation

Heel pain can also be caused by irritation or entrapment of a nerve. When nerve tissue is involved, the pain may feel burning, tingling, shooting or electric rather than simply sore. Some patients notice numbness or symptoms spreading into the arch or ankle.

Nerve-related heel pain is less common than plantar fascia pain, but it should not be overlooked, particularly when symptoms do not fit the usual pattern or have not improved with basic treatment.

Stress injury or bone-related pain

The heel bone can develop stress-related injury, particularly after changes in training load, impact activity or prolonged overuse. Bone stress pain tends to be more persistent and can feel severe with weight-bearing. In some cases, there may be pain when the heel is compressed from the sides.

This is one reason persistent heel pain should not be self-diagnosed for too long. Continuing to load a stress injury as if it were a simple soft tissue problem can delay recovery.

Why heel pain is not always caused by the heel itself

A heel is where you feel the pain, but not always where the problem starts. Limited ankle movement, calf weakness or tightness, altered walking pattern, and poor load distribution through the foot can all place extra strain on the heel over time.

That does not mean every patient needs a complex biomechanical explanation. It means the local pain should be assessed in context. The tissue itself matters, but so do the forces passing through it. This is often why short-term pain relief alone is not enough in recurring cases.

What causes heel pain to become persistent?

The longer heel pain continues, the less likely it is to settle from rest alone. Ongoing irritation usually reflects one of three issues. The first is that the original diagnosis was incomplete or wrong. The second is that activity was reduced for a while, but the reason the tissue became overloaded was never addressed. The third is that treatment was started too generically.

For example, stretching everything because heel pain is assumed to be plantar fasciitis may not help if the main issue is a bruised fat pad, an irritable insertional Achilles tendon or a nerve problem. Equally, using off-the-shelf insoles without understanding whether the tissue needs support, cushioning, load reduction or something else can produce mixed results.

Persistent symptoms are also more likely where patients try to push through pain for weeks or months. That is understandable, especially if the problem seems minor at first, but heel pain often becomes harder to treat once it has settled into a chronic pattern.

When assessment matters most

If heel pain is severe, worsening, present at rest, associated with swelling, or stopping you from walking normally, it is worth having it assessed promptly. The same applies if the pain has lasted more than a few weeks, keeps returning, or does not match the classic first-step pattern people often associate with plantar fasciitis.

A proper assessment should establish where the pain is, what tissue is likely involved, what is provoking it, and whether imaging is clinically useful. In a clinic setting, that may include hands-on examination, movement testing and, where indicated, diagnostic ultrasound to assess structures such as the plantar fascia, Achilles tendon or bursa.

This is especially useful when symptoms are persistent or when more than one structure may be involved. At South London Foot Clinic, the aim is to make the diagnosis clear before treatment is planned, so patients understand both the source of pain and the logic behind the next steps.

What happens after the cause is identified?

Treatment depends on the diagnosis, not just the label of heel pain. For some patients, that means activity modification, footwear advice and a structured rehabilitation plan. For others, it may involve orthotic intervention, hands-on treatment, targeted exercises or, in selected cases, injection therapy.

There is no single best treatment for all heel pain. A runner with insertional Achilles pain, an office worker with plantar fasciitis, and a patient with thinning heel fat pad tissue may all need different strategies. That is why accurate diagnosis is more than a technical detail. It shapes the whole pathway.

Recovery times vary as well. Some heel pain settles within weeks when addressed early. More persistent cases can take longer, particularly if symptoms have been present for months or if the tissue is repeatedly irritated by work demands or sport. Clear expectations help here. Most patients do better when they understand not just what is wrong, but what needs to change for it to improve.

Heel pain is common, but it should not be treated as one condition with one answer. If you are trying to work out what causes heel pain in your case, the most useful question is often not “what is the best treatment?” but “which structure is actually causing the pain?” Once that is clear, treatment becomes far more focused, and usually far more effective.