Most heel spurs cause no symptoms at all, which makes them surprisingly hard to detect without an X-ray. About half of people with plantar fasciitis have a heel spur visible on imaging, but many people with spurs on their X-rays have zero pain. The only definitive way to confirm a heel spur is through an X-ray, but certain patterns of heel pain can suggest one is present.
What a Heel Spur Actually Is
A heel spur is a bony calcium deposit that forms on the underside of the heel bone, where the thick band of tissue on the bottom of your foot (the plantar fascia) attaches. These deposits develop gradually from long-term tension and stress at that attachment point. In a study of 75 patients, the average spur measured about 4 millimeters long, though they ranged from nearly invisible to over 12 millimeters.
The critical thing to understand is that heel spurs don’t directly cause pain in most cases. The American Academy of Orthopaedic Surgeons states plainly that heel spurs do not cause plantar fasciitis pain. The pain you feel typically comes from irritation of the surrounding soft tissue, not from the bony growth itself. This is why many people walk around with heel spurs and never know it.
Symptoms That Suggest a Heel Spur
When a heel spur does produce symptoms, the pain feels nearly identical to plantar fasciitis: a sharp, stabbing sensation on the bottom of your foot near the heel. The hallmark pattern is intense pain with your first steps in the morning or after sitting for a long period. The pain typically fades after a few minutes of walking as the tissue warms up, then returns when you stand again after resting.
Other characteristics to watch for:
- Pain after activity, not during it. You might feel fine on a walk or run, then notice increased pain once you stop and rest.
- A specific tender spot. The point of maximum tenderness is usually on the bottom of your foot, just in front of the heel bone. Pressing firmly on that area with your thumb produces a sharp, localized response.
- Pain that comes and goes. Unlike a bruise or fracture, spur-related pain tends to flare and subside throughout the day depending on your activity level.
You can check for that tender spot yourself. Sit down, cross the affected foot over your opposite knee, and use your thumb to press along the bottom of your heel, focusing on the inner side near the front edge of the heel bone. If pressing there reproduces the sharp pain you’ve been experiencing, that’s consistent with irritation at the plantar fascia attachment, the same spot where spurs form.
Why You Can’t Diagnose a Spur by Symptoms Alone
The frustrating reality is that heel spur pain and plantar fasciitis pain feel the same. Both produce stabbing pain in the same location with the same morning-stiffness pattern. Research from the American Academy of Family Physicians found that heel spurs are present in roughly 50% of plantar fasciitis cases, but they don’t correlate well with symptoms. Some people with large spurs have minimal pain, while others with no visible spur have severe pain.
That said, spur size does appear to matter once a spur is present. A study of plantar fasciitis patients found that larger spurs correlated significantly with higher pain scores and worse functional outcomes. Longer symptom duration, higher body weight, and older age were all linked to larger spurs. So if you’ve had heel pain for months or years rather than weeks, the likelihood of a spur being part of the picture increases.
How Heel Spurs Are Confirmed
An X-ray is the standard way to identify a heel spur. The bony growth shows up clearly on a lateral (side-view) foot X-ray as a pointed protrusion extending from the bottom of the heel bone. A meta-analysis in the Journal of Foot and Ankle Research found that people with plantar heel pain were nearly five times more likely to have a visible calcaneal spur on X-ray compared to people without heel pain. When the researchers looked only at the most rigorously designed studies, that number jumped to twelve times more likely.
Your doctor will also likely check the thickness of your plantar fascia using ultrasound. A thickness greater than 4 millimeters is a strong indicator of plantar fasciitis, which often accompanies heel spurs. The combination of a visible spur on X-ray and thickened fascia on ultrasound gives the clearest diagnostic picture.
Risk Factors That Make Spurs More Likely
Heel spurs develop over time from repeated mechanical stress, so certain body types and activity patterns put you at higher risk. Low arches (flat feet) are particularly common among people who develop heel pain. In one study of plantar fasciitis patients, about 43% had low arches, compared to only 5% with high arches. Flat feet place extra tension on the plantar fascia with each step, and that chronic pulling at the heel bone attachment is what stimulates spur growth over months and years.
Weak foot muscles also play a significant role. When the small muscles inside your foot and the muscles controlling your ankle can’t adequately stabilize your arch, your plantar fascia absorbs more stress than it’s designed to handle. This leads to reduced arch stability and compromised shock absorption, creating a cycle where each step compounds the damage. People with heel pain also tend to walk more slowly, take shorter steps, and shift their weight away from the heel and forefoot toward their toes as a protective compensation.
Other factors that increase your risk include carrying excess body weight (higher BMI correlates with larger spurs), spending long hours standing on hard surfaces, wearing shoes with poor arch support, and simply getting older. Spur incidence rises with age as the cumulative stress on the heel bone adds up over decades.
What to Do If You Suspect a Heel Spur
If your heel pain follows the classic pattern of morning stiffness, stabbing pain near the front of the heel bone, and flare-ups after rest, you’re dealing with either plantar fasciitis, a heel spur, or both. The practical difference matters less than you might think, because the treatment approach is the same regardless of whether a spur is present. Plantar fasciitis pain can be treated without removing the spur.
Initial management focuses on reducing the mechanical stress that caused the problem. Stretching your calf muscles and plantar fascia, wearing supportive shoes, using heel cups or orthotic inserts, and icing the area after activity all help. Rolling a frozen water bottle under your foot for 10 to 15 minutes serves double duty. Most people see significant improvement within several months with consistent conservative care.
If your pain has persisted for more than a few weeks, or if it’s severe enough to change how you walk, getting an X-ray is worthwhile. Knowing whether a spur is present helps your doctor gauge the chronicity of the problem and plan next steps if initial treatment doesn’t resolve your symptoms. The X-ray also rules out other causes of heel pain like stress fractures, which require different management entirely.