Bone spurs in the feet form when your body lays down extra bone tissue in response to damage, stress, or prolonged pressure. They’re small, smooth growths that develop along the edges of bones, most commonly on the heel but also on the toes and midfoot joints. Between 15% and 25% of the general population has heel spurs without ever knowing it, because many cause no pain at all. When they do cause symptoms, understanding what triggered them helps guide the right approach to relief.
How Bone Spurs Actually Form
A bone spur isn’t a sharp spike growing out of nowhere. It’s your body’s attempt at repair. When bone or the soft tissue attached to it is stressed or damaged over time, the body responds by depositing new bone in the affected area. Think of it as a bony scar. This process, called osteophytosis, is slow and gradual, building up over months or years of repeated irritation.
The feet are especially vulnerable because they absorb the full force of your body weight thousands of times a day. Every step creates micro-stress on bones, joints, and the ligaments that connect them. When that stress is chronic, whether from how you walk, what you wear on your feet, or how much load your feet carry, the repair process can overshoot and produce a visible bony projection on an X-ray.
The Plantar Fasciitis Connection
The most common bone spur in the foot is a calcaneal spur, a growth on the underside of the heel bone. It develops at the spot where the plantar fascia, the thick band of tissue running along the bottom of your foot, attaches to the heel. When the plantar fascia is chronically strained, that attachment point gets pulled and irritated over and over. The body responds by reinforcing the area with extra bone.
This is why heel spurs and plantar fasciitis so often appear together. The spur itself usually isn’t the source of pain. The inflammation in the fascia is. Many people with large heel spurs feel nothing, while others with tiny spurs or no spur at all have severe heel pain. A heel spur on an X-ray tells you there’s been longstanding tension at that attachment point, but it doesn’t automatically explain your symptoms.
Osteoarthritis and Joint Wear
Joint damage from osteoarthritis is the single most common cause of bone spurs throughout the body, including the feet. In a healthy joint, cartilage cushions the ends of the bones where they meet. As osteoarthritis breaks down that cartilage, the bones start to rub closer together. The body tries to compensate for the lost cushion by building new bone along the joint’s edges.
In the feet, this most often affects the big toe joint (the first metatarsophalangeal joint), where it can limit how far you can bend your toe when walking. Spurs can also develop in the midfoot joints, particularly in people who’ve had previous injuries or who carry excess weight. These joint-related spurs tend to cause stiffness and a dull ache that worsens with activity, rather than the sharp stabbing pain associated with plantar fasciitis.
Body Weight and Mechanical Load
Carrying extra weight significantly increases your risk. Research comparing people with painful heel spurs to those without found that average BMI was 35.2 in the spur group versus 30.9 in the control group. After adjusting for other factors, obesity (a BMI over 30) roughly tripled the odds of developing a symptomatic heel spur. The mechanism is straightforward: higher body weight means more vertical pressure on the heel with every step. Over years, that extra load accelerates the tissue damage that triggers spur formation.
This also explains why heel spurs become more common with age. About 11% to 21% of young and middle-aged adults have calcaneal spurs, but by age 60, incidence jumps by roughly 55%. Decades of accumulated stress, combined with the natural thinning of the fat pad under the heel and gradual cartilage loss in joints, create ideal conditions for new bone growth.
Footwear and Daily Habits
Shoes that lack arch support force the plantar fascia and other foot structures to absorb forces they aren’t designed to handle alone. Flat shoes, worn-out sneakers, and going barefoot on hard surfaces like tile or hardwood floors all increase strain on the heel attachment point. High heels shift weight distribution in ways that stress the forefoot joints, potentially contributing to spurs near the toes.
Occupations and activities matter too. Jobs that keep you on your feet for hours on hard surfaces, running on pavement, and sudden increases in physical activity all raise the cumulative load on foot bones and ligaments. The common thread is repetitive mechanical stress without adequate cushioning or recovery time.
Other Contributing Factors
Foot mechanics play an underappreciated role. Flat feet (overpronation) cause the plantar fascia to stretch more than normal with each step, increasing tension at the heel. High arches create the opposite problem, concentrating pressure on the heel and ball of the foot because the midfoot doesn’t absorb its share of impact. Both patterns increase the likelihood of spur development over time.
Tight calf muscles and Achilles tendons also contribute by pulling on the back of the heel bone, which can encourage spur growth at the Achilles insertion point (a posterior heel spur, as opposed to the more common plantar variety). Previous foot injuries, including stress fractures and ligament sprains that didn’t fully heal, can trigger localized bone remodeling that eventually produces spurs.
How Bone Spurs Are Found
Most bone spurs in the feet are discovered on a standard X-ray, which remains the first-line imaging tool because it’s widely available and inexpensive. A spur shows up as a small pointed or shelf-like projection extending from the bone surface. The catch is that heel spurs appear frequently in people with no symptoms at all, so finding one on an X-ray doesn’t automatically mean it’s causing your pain.
When X-ray findings don’t match the clinical picture, MRI can provide a clearer view of the soft tissues around the spur, revealing whether the plantar fascia, tendons, or joint cartilage are inflamed or torn. CT scans are occasionally used when detailed bone anatomy matters, such as distinguishing a spur from a stress fracture. Ultrasound can also evaluate the plantar fascia thickness and detect inflammation at the spur site in real time during an office visit.
What You Can Do About the Causes
Because bone spurs are a response to stress and damage, the most effective strategies target those root causes rather than the spur itself. Reducing mechanical overload is the priority. That means wearing supportive shoes with cushioned heels, using orthotic inserts if you have flat feet or high arches, and avoiding prolonged barefoot walking on hard surfaces.
If excess weight is a factor, even modest weight loss reduces the vertical force on your heels with every step. Stretching the calves, Achilles tendon, and plantar fascia daily helps reduce the pulling forces on the heel bone. For arthritis-related spurs in the toe or midfoot joints, maintaining joint mobility through gentle range-of-motion exercises can slow the progression.
Bone spurs that have already formed don’t go away on their own, but they don’t necessarily need to. The goal is managing the condition that caused them. When pain persists despite conservative measures, options range from physical therapy and cortisone injections to, in rare cases, surgical removal of the spur along with repair of the damaged tissue around it. Most people, though, find relief by addressing the underlying mechanical and lifestyle factors that set the process in motion.