Heel Spurs: What They Are and Whether They're Actually the Problem
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If you've had heel pain and seen a doctor, there's a good chance "heel spur" came up somewhere in the conversation — maybe as the primary diagnosis, maybe on an X-ray report, maybe as the explanation a well-meaning person offered for why your heel hurts. The problem is that heel spurs are one of the most misunderstood diagnoses in musculoskeletal medicine. Understanding what they actually are — and what they aren't — is the first step toward treating the right thing.
What a Heel Spur Actually Is
A heel spur is a calcium deposit on the heel bone (calcaneus). The most common type forms on the plantar surface of the heel — the underside — at the point where the plantar fascia attaches. This type is called a plantar calcaneal spur or inferior heel spur.
A second type forms on the posterior surface of the heel — the back — at the Achilles tendon insertion. This is less common and associated with Achilles tendinopathy and Haglund's deformity.
Both types form through the same mechanism: chronic stress at a tendon or ligament attachment causes micro-damage, and the body responds by depositing calcium as part of the healing process. Over years, this calcium accumulates into a visible protrusion on X-ray — the "spur."
The Key Fact Most People Get Wrong
Here's what the imaging research consistently shows:
Heel spurs are common in people who have no heel pain. Studies using X-rays in asymptomatic populations find plantar heel spurs in approximately 15–20% of adults — people who feel no discomfort whatsoever. Conversely, most people with plantar fasciitis don't have a visible spur on X-ray.
The numbers work out roughly like this:
- ~50% of people with plantar fasciitis have a heel spur visible on X-ray
- ~20% of people with no heel pain also have a spur visible on X-ray
This means the spur and the pain are correlated — they often appear together because they have the same root cause (plantar fascia overload) — but the spur is not causing the pain. The inflamed, irritated plantar fascia tissue is causing the pain.
This distinction is clinically important for one specific reason: surgery to remove the spur has poor outcomes when the underlying tissue pathology isn't addressed. Patients who undergo spur removal without treating the plantar fascia inflammation frequently have persistent or recurrent pain.
Why Spurs Form in the First Place
The plantar fascia absorbs and distributes tensile force with every step. When it's chronically overloaded — because of flat feet, tight calf muscles, high training volume, unsupportive footwear, or sudden changes in activity — the repeated stress at its heel attachment causes microscopic tears. The body responds with an inflammatory repair process, and over months to years, calcium is deposited in the damaged tissue.
The spur is, in a sense, the evidence of a long-term plantar fascia stress problem. Treating the spur without addressing the overload is like replacing a warning light without fixing the engine.
What Actually Causes the Pain
For most people diagnosed with "heel spurs," the pain source is the surrounding soft tissue, not the calcium deposit itself. The structures most commonly involved:
Plantar fascia: Inflamed, thickened tissue at the heel attachment is the primary pain generator in the vast majority of cases. For a full breakdown of plantar fasciitis →
Plantar fascia enthesopathy: Degeneration and partial tearing at the fascial attachment is a distinct (and more chronic) condition from acute plantar fasciitis. Both can coexist with a calcaneal spur.
Heel fat pad: In some cases, thinning of the heel's natural cushioning pad contributes to pain that coexists with a spur. See the full heel pain causes guide for more. →
Treatment: What Actually Works
Because the pain comes from the soft tissue rather than the spur itself, treatment is directed at the plantar fascia and surrounding structures:
Stretching. The plantar fascia stretch (toe extension against the foot, held 30 seconds, performed 3x before getting out of bed) and calf stretches are the most evidence-supported conservative interventions. Tight calf muscles increase tensile stress on the plantar fascia — stretching them reduces load at the heel attachment.
Orthotic support. Custom orthotics for heel spur/plantar fasciitis work by redistributing plantar pressure away from the medial heel attachment, controlling pronation, and providing a cushioned surface under the heel. Multiple RCTs have found custom orthotics more effective than sham orthotics and prefabricated insoles for reducing pain.
Appropriate footwear. Shoes with adequate heel cushioning and arch support reduce direct impact on the plantar fascia attachment. Thin-soled or flat shoes place more direct load on the heel.
Load modification. Reducing running volume, avoiding barefoot walking on hard surfaces, and taking breaks from prolonged standing gives irritated tissue time to recover.
Physical therapy. Eccentric calf exercises, shockwave therapy, and soft tissue mobilization are used for cases that don't respond to initial conservative care.
Cortisone injections. Useful for short-term pain reduction in refractory cases. Repeated injections risk weakening the plantar fascia and accelerating fat pad atrophy — generally limited to 1–2 over the course of treatment.
Surgery. Reserved for cases that have failed 6–12 months of comprehensive conservative care. Endoscopic plantar fascia release (partially cutting the fascia to reduce tension) is more commonly performed than spur removal itself, and with better outcomes.
What Won't Help
- Removing the spur without treating the fascia — poor evidence, high recurrence
- Complete rest — the fascia needs graduated loading to heal; total inactivity can weaken the tissue further
- Repeated cortisone injections — effective short-term but carries risks with repetition
Frequently Asked Questions
If my X-ray shows a heel spur, do I need surgery?
Almost certainly not, at least not immediately. The large majority of heel spurs respond to conservative treatment because the pain is coming from the soft tissue around the spur, not the spur itself. Surgery is appropriate only after 6–12 months of consistent, well-managed conservative care has failed to provide adequate relief.
Will the spur go away with treatment?
Conservative treatment doesn't dissolve or remove the calcium deposit. The spur may remain on X-ray indefinitely, but the pain — which comes from the inflamed tissue, not the spur — resolves with appropriate care. You can have a visible spur on X-ray and be entirely pain-free.
Is there a difference between a "heel spur" and "bone spur on the heel"?
No meaningful difference. Both terms refer to a calcium deposit (osteophyte) on the heel bone. The most clinically important variant is the plantar calcaneal spur, which forms at the plantar fascia attachment on the underside of the heel.
My doctor said my spur is "digging into the tissue" — is that accurate?
This is a commonly repeated but clinically imprecise explanation. Most plantar heel spurs point toward the arch (anteriorly), not downward into the fat pad. They don't act like a tack or needle pressing into the heel. The pain mechanism is tensile stress and inflammation at the fascia attachment, not mechanical impingement by the spur.
Heel spurs are more accurately described as a marker of chronic plantar fascia overload than as an independent cause of pain. Treating the overload — through orthotics, stretching, and load management — addresses the actual problem. The spur itself doesn't need to go anywhere.
Take the foot assessment to find out what's driving your heel pain →