A heel spur is a bony growth that forms on the underside of your heel bone, where it connects to the thick band of tissue (the plantar fascia) running along the bottom of your foot. These calcium deposits develop gradually over months or years in response to repeated stress, and they’re surprisingly common. In one large study of over 1,300 people who had ankle X-rays taken for unrelated reasons, about 32% had a plantar heel spur without ever knowing it.
How Heel Spurs Form
Heel spurs don’t appear overnight. They’re the result of a slow, repetitive process. Every time your foot strikes the ground, the plantar fascia tugs on the spot where it attaches to your heel bone. When that stress is excessive or constant, it creates tiny tears in the tissue near the attachment point. Your body tries to repair those micro-tears, triggering inflammation. Over time, calcium deposits build up in the damaged area as part of that repair response, eventually hardening into a bony projection.
The most common underlying cause is abnormal pronation, where your foot rolls inward too much when you walk or run. This increases tension on the plantar fascia and the structures around the heel bone, amplifying the pulling force that drives spur formation. Spurs typically measure a few millimeters long. In one study, the average spur length was about 4 mm, though some reached over 12 mm.
Risk Factors
Several things increase your chances of developing a heel spur:
- Excess body weight. More weight means more force on your heel with every step. That extra load accelerates the micro-tearing process in the plantar fascia. People with a higher BMI are also more likely to develop flat feet or fallen arches, which compounds the problem by shifting stress toward the heel.
- High-impact activities. Running, jumping, and other repetitive activities put sustained pressure on the heel bone and its surrounding tissues.
- Improper footwear. Shoes with poor arch support or thin soles fail to absorb shock, forcing your heel to take the full impact.
- Foot structure abnormalities. Flat feet, high arches, and tight calf muscles all change how force distributes across your foot, making spur formation more likely.
The Connection to Plantar Fasciitis
Heel spurs and plantar fasciitis are closely related but not the same thing. Plantar fasciitis is inflammation of the plantar fascia itself. A heel spur is a structural change in the bone. The two frequently overlap: in one study, 89% of patients with plantar fasciitis had a visible heel spur on X-ray, compared to only 32% of people without the condition. But the relationship isn’t straightforward. Many people with large spurs feel no pain, while others with tiny or no spurs have severe plantar fasciitis.
What this means in practice is that the spur itself usually isn’t the source of pain. The inflammation in the surrounding soft tissue is. This is why treatment focuses on calming the fascia rather than removing the bony growth.
What Heel Spur Pain Feels Like
Most people with heel spurs never experience symptoms. When pain does occur, it closely mimics plantar fasciitis: an intense stabbing sensation in the bottom of the heel, worst with the first steps in the morning or after sitting for a while. The pain typically eases once you’ve walked for a few minutes and the tissue loosens up, then returns after another period of rest. Some people describe it as feeling like stepping on a sharp stone or a tack.
The pain tends to come and go throughout the day rather than staying constant. Standing on hard surfaces for long periods, walking barefoot, or wearing unsupportive shoes can all trigger flare-ups.
How Heel Spurs Are Diagnosed
A heel spur is visible on a standard X-ray of the foot. Radiologists measure the spur’s length from tip to base in millimeters. But because so many spurs are painless, finding one on an X-ray doesn’t automatically explain your heel pain. Your doctor will also assess your symptoms, check for tenderness in specific spots on the heel, and evaluate your gait and foot mechanics to determine whether the spur is actually contributing to your discomfort or is an incidental finding.
Non-Surgical Treatment
The good news is that more than 90% of people with symptomatic heel spurs recover without surgery. Conservative treatment focuses on reducing inflammation and relieving the mechanical stress that caused the problem in the first place.
Stretching is one of the most effective first steps. Regularly stretching your calf muscles and the plantar fascia helps reduce the tension pulling on your heel bone. Rolling a frozen water bottle under the arch of your foot serves double duty, stretching the fascia while icing the inflamed area. Shoe inserts or custom orthotics can correct abnormal pronation and redistribute pressure away from the heel. Supportive shoes with cushioned soles and firm arch support make a noticeable difference for many people, especially those who spend long hours on their feet.
Ice, rest, and over-the-counter anti-inflammatory medications help manage pain during flare-ups. Physical therapy can address underlying gait problems and strengthen the muscles that support the arch. If you carry extra weight, even modest weight loss reduces the repetitive load on your heel with every step, which can slow or stop the cycle of tissue damage and inflammation.
When Surgery Becomes an Option
The American College of Foot and Ankle Surgeons recommends considering surgery only after at least six months of non-surgical treatment has failed to improve symptoms. This is a relatively rare outcome given the high success rate of conservative care.
Surgery typically involves releasing part of the plantar fascia, removing the spur, or both. Recovery depends on the extent of the procedure. Desk workers may return to normal activities within a few days to a couple of weeks. People whose jobs involve heavy lifting or prolonged standing can expect several weeks or longer before they’re fully back on their feet. The surgery is generally considered a last resort because the vast majority of people find relief through less invasive approaches long before reaching that point.