A calcaneal spur is a bony growth that develops on the heel bone (calcaneus) when your body deposits extra calcium in response to ongoing stress or inflammation. These spurs can form on the bottom of the heel or at the back where the Achilles tendon attaches, and they’re surprisingly common. In studies of lateral ankle X-rays, up to 38% of adults have at least one type of calcaneal spur. Many of those people have no symptoms at all.
How Calcaneal Spurs Form
Your heel bone sits at the base of a complex system of tendons and ligaments that absorb the impact of every step you take. When those soft tissues are repeatedly strained, torn, or inflamed, your body tries to reinforce the area by laying down new bone. Over months or years, that extra bone tissue builds into a pointed growth, sometimes visible on an X-ray as a small hook or shelf extending from the heel.
The most common pathway starts with plantar fasciitis, the inflammation of the thick band of tissue that runs along the bottom of your foot. As the plantar fascia pulls on the heel bone over and over, the bone responds by growing outward at the attachment point. But spurs can also develop from repeatedly tearing the membrane that covers the heel bone, or from biomechanical issues that change how force is distributed across your foot.
Two Types of Calcaneal Spurs
Calcaneal spurs fall into two categories based on where they grow. Plantar heel spurs form on the underside of the heel, right where the plantar fascia or the small muscles of the foot originate. These are the more common type and are closely tied to plantar fasciitis. Dorsal heel spurs grow at the back of the heel where the Achilles tendon connects, and they’re associated with Achilles tendon problems instead.
In one study of over 1,000 ankle X-rays, about 11% of people had a plantar spur, about 9% had a dorsal spur, and 11% had both. The distinction matters because the two types involve different tendons, cause pain in different spots, and respond to somewhat different treatments.
Risk Factors
Several things increase your likelihood of developing a calcaneal spur. Obesity is one of the strongest predictors. People with a BMI over 30 have roughly 2.7 times the odds of developing a plantar heel spur with plantar fasciitis compared to those at a healthy weight. The extra load on the foot accelerates the stress cycle that triggers bone growth.
Other risk factors include increasing age, loss of the natural fat pad under the heel, flat feet or very high arches, and inflammatory conditions like arthritis. On the lifestyle side, shoes with poor cushioning or inadequate arch support, prolonged standing on hard surfaces, and high-impact activities like long-distance running all contribute. Diabetes has also been linked to heel spur development in older adults.
Symptoms and Why Some Spurs Don’t Hurt
Here’s what confuses many people: the spur itself often isn’t the source of pain. Plenty of calcaneal spurs show up on X-rays taken for unrelated reasons, in people who have never had heel pain. The pain typically comes from the inflamed soft tissue around the spur, not from the bony growth pressing into your foot.
When symptoms do appear, they usually include a sharp, stabbing pain on the bottom of the heel that’s worst with the first few steps in the morning. The pain may ease as you move around, then return after long periods of standing or when you stand up after sitting. Some people describe it as feeling like stepping on a small stone. With dorsal spurs, the pain is at the back of the heel and tends to worsen with activities that load the Achilles tendon, like climbing stairs or running.
How Calcaneal Spurs Are Diagnosed
A standard lateral X-ray of the foot is usually enough to confirm a calcaneal spur. The bony projection is typically easy to spot. However, because spurs are so common in people without symptoms, finding one on an X-ray doesn’t automatically explain your heel pain. Your doctor will also assess the soft tissues through a physical exam, checking for tenderness, swelling, and tightness in the plantar fascia or Achilles tendon. In some cases, an MRI may be used to evaluate the soft tissue damage more precisely, especially if the diagnosis is unclear or initial treatment hasn’t helped.
Treatment Without Surgery
The good news is that the vast majority of people improve without surgery. More than 90% of patients with plantar fasciitis and associated heel spurs get better within 10 months using conservative approaches. The goal isn’t to remove the spur, since it’s rarely the actual problem. Instead, treatment focuses on calming the inflammation and reducing the mechanical stress that caused it.
Stretching is the single most effective intervention. Calf stretches and plantar fascia stretches performed consistently throughout the day can significantly reduce pain. Rolling your foot over a frozen water bottle for 20 minutes, three to four times a day, helps with both inflammation and discomfort. Cutting back on high-impact activities and switching to cycling or swimming while you heal takes pressure off the foot.
Supportive footwear makes a real difference. Shoes with thick soles and good cushioning reduce pain during standing and walking. Soft silicone heel pads are an inexpensive option that elevate and cushion the heel. Over-the-counter or custom orthotics can correct biomechanical issues that contributed to the problem in the first place.
Night splints are another effective tool that many people overlook. Most people sleep with their feet pointed downward, which lets the plantar fascia shorten overnight. That’s why those first morning steps are the most painful. A night splint holds your foot at a 90-degree angle while you sleep, keeping the fascia gently stretched. They can take some getting used to, but they’re very effective at reducing morning pain.
Anti-inflammatory medications like ibuprofen or naproxen can help in the short term but shouldn’t be relied on for more than a month without medical guidance.
Shockwave Therapy
For people who don’t respond well to basic conservative treatment, extracorporeal shockwave therapy (ESWT) is a non-invasive option. The procedure uses targeted pressure waves to stimulate healing in damaged tissue. Research shows a short-term success rate of about 63%, which improves to around 80% with longer follow-up as the tissue continues to heal after treatment. It’s typically considered after several months of conservative measures haven’t provided enough relief.
When Surgery Becomes an Option
Surgery for calcaneal spurs is uncommon and generally reserved for the small percentage of people who’ve tried conservative treatment for many months without meaningful improvement. The procedure may involve releasing part of the plantar fascia, removing the spur, or both.
Recovery depends on the type of surgery. Swelling and skin discoloration around the incision are normal in the first few days. If you have a desk job, you may return to work within a few days. Jobs involving heavy lifting or prolonged standing may require several weeks or longer before you’re ready. Full recovery of strength and normal movement takes time, and you’ll likely need to limit activity during that period.
Living With a Calcaneal Spur
Many people live with calcaneal spurs and never know they have them. If yours is causing pain, the path forward is usually straightforward: reduce the inflammation, stretch consistently, support your feet with proper footwear, and give your body time to heal. The spur itself may stay on the X-ray permanently, but that’s not a problem. What matters is resolving the soft tissue irritation around it, and for most people, that’s entirely achievable without anything more than patience and a good pair of shoes.