Heel pain almost always traces back to one of a handful of structural problems in and around the calcaneus, the bone that forms your heel. The single most common cause is irritation of the plantar fascia, the thick band of tissue running along the bottom of your foot. But the heel is a surprisingly complex meeting point of bone, tendon, nerve, and fat, and when any of those structures is stressed or damaged, the pain can feel nearly identical. Figuring out which structure is actually the source matters, because the treatments diverge.
Plantar Fasciitis and What Actually Happens in the Tissue
Plantar fasciitis is the diagnosis behind the majority of heel pain complaints, especially the sharp stab people feel with their first steps in the morning. The classic explanation is that flat feet or poor biomechanics pull the plantar fascia too tight, causing tiny tears and inflammation where it attaches to the heel bone. That story is partly right: excessive tensile strain on the fascia does appear to drive damage, and foot types with a low arch are thought to be especially vulnerable. But tissue samples from people who have had heel pain for months tell a different story. Researchers examining the fascia under a microscope rarely find active inflammation; instead, they find degenerative changes in the collagen, more like a worn-out rope than an inflamed wound.1PubMed. The pathomechanics of plantar fasciitis That distinction matters because treatments aimed purely at reducing inflammation, like ice and anti-inflammatory drugs, may calm symptoms without addressing the underlying tissue breakdown.
On imaging, people with plantar heel pain consistently show a thicker plantar fascia than pain-free individuals. A meta-analysis pooling ultrasound measurements from hundreds of participants found that the fascia was, on average, about 2 mm thicker in symptomatic feet, with the difference reaching roughly 3 mm when measured at its thickest point.2PubMed Central. Medical imaging for plantar heel pain: a systematic review and meta-analysis – Section: Plantar fascia thickness Ultrasound can pick this up reliably: when compared with MRI as a reference, ultrasound showed about 80% sensitivity and nearly 89% specificity for diagnosing the condition.3PubMed. Clinical utility of sonography in diagnosing plantar fasciitis
The Heel Spur Question
Many people who get an X-ray for heel pain are told they have a calcaneal spur, a bony growth on the underside of the heel bone. The natural assumption is that the spur itself is poking into the tissue and causing the pain. The reality is messier. One study found spurs in about 85% of painful feet but also in roughly 72% of painless feet.4PubMed Central. Do the presence, size, and shape of plantar calcaneal spurs have any significance in terms of pain and treatment outcomes in patients with plantar fasciitis? Spurs are common in people who have never had a moment of heel pain. That said, they are not entirely innocent bystanders. Spur length correlates with symptom duration, body mass index, and pain severity, suggesting the spur grows in response to the same chronic mechanical stress that damages the fascia.5PubMed. The association of calcaneal spur length and clinical and functional parameters in plantar fasciitis And when both a spur and a thickened plantar fascia are present together, the combination roughly doubles the odds of being in the painful group compared with controls.6Rheumatology. Coexistence of plantar calcaneal spurs and plantar fascial thickening in individuals with plantar heel pain
The practical takeaway: a spur on an X-ray does not automatically explain your heel pain, and removing the spur surgically is rarely necessary. Think of it as a marker of long-standing stress rather than a cause in its own right.
Achilles Tendinopathy at the Heel
The pain from Achilles tendinopathy sits at the back of the heel rather than the bottom, right where the tendon inserts into the bone. This insertional form of the condition affects athletes and non-athletes alike, producing chronic pain that worsens with activity and can become disabling over time.7Journal of the American Academy of Orthopaedic Surgeons. Management of Insertional Achilles Tendinopathy Because the pain is in the heel region, people sometimes confuse it with plantar fasciitis, but the location and behavior differ. Insertional Achilles pain typically spikes when you push off during walking or running, and the tender spot is easy to pinpoint at the back of the heel bone. Squeezing the sides of the heel or pressing on the bottom usually does not reproduce it.
When the Fat Pad Wears Thin
Your heel bone sits on a specialized pad of fat that works as a built-in shock absorber. This pad dissipates a significant share of the impact energy that returns from the ground each time your heel strikes, with estimates ranging from roughly 17% to 45% of that energy depending on the individual and the method of measurement.8Journal of Experimental Biology. Rethinking the evolution of the human foot: insights from experimental research – Section: Foot strike and collision When the pad atrophies, the bone loses its cushion and you feel a deep, bruise-like ache that worsens with prolonged standing or walking on hard surfaces. Fat pad atrophy tends to show up with aging, rheumatic diseases, diabetes, and obesity.9PubMed Central. What do we actually know about a common cause of plantar heel pain? A scoping review of heel fat pad syndrome – Section: Diagnostic criteria and etiology It is frequently overlooked in favor of a plantar fasciitis diagnosis, partly because the two conditions can coexist and partly because clinicians are simply more accustomed to thinking about the fascia.
Nerve Entrapment Hiding Behind a Familiar Label
One of the more commonly missed causes of heel pain involves Baxter’s nerve, a small branch of the lateral plantar nerve that runs along the inner side of the heel. When this nerve gets pinched, it produces chronic, burning pain in the medial heel that overlaps so closely with plantar fasciitis that the two are frequently confused.10PubMed. Baxter’s nerve: the hidden culprit of chronic heel pain Clues that nerve entrapment may be involved include tingling, numbness, or a burning quality to the pain that does not fit the usual plantar fasciitis pattern. If you have been treated for months with stretching and orthotics and the pain has barely budged, nerve compression is worth investigating. Advanced imaging or nerve conduction studies can help sort it out, and the treatment path, which may eventually include targeted nerve release, differs from standard fascia-focused therapy.
Stress Fractures in the Heel Bone
The calcaneus bears enormous loads with every step, and when repetitive forces outpace the bone’s ability to repair itself, the result is a stress fracture. It is the second most common stress fracture in the foot.11American Journal of Physical Medicine & Rehabilitation. Fatigue Fracture of the Calcaneus Military recruits, distance runners, and anyone who ramps up weight-bearing activity too quickly are at highest risk. The tricky part is diagnosis. Symptoms mimic many other heel conditions, pain with weight-bearing that eases with rest, and standard X-rays can look normal in the early weeks. MRI is far more sensitive, but it is not always the first test ordered, which can delay identification.12PubMed Central. Delayed Diagnosis of Calcaneal Stress Fracture: A Case Report Squeezing the sides of the heel bone together (the “squeeze test”) can help raise suspicion, because that maneuver does not usually provoke plantar fasciitis but lights up a stress fracture.
Heel Pain in Kids
Children and adolescents get heel pain too, and the usual culprit is Sever’s disease, an irritation of the growth plate at the back of the heel. It tends to strike around age 12, slightly earlier in girls than boys, and is most common in sports that involve running.13Scandinavian Journal of Medicine & Science in Sports. Calcaneal apophysitis (Sever’s disease) — a common cause of heel pain in young athletes The pain is usually one-sided and flares with activity, then fades with rest. It resolves on its own once the growth plate closes, though managing activity levels and using heel cushions can make the intervening months much more comfortable.
Sever’s disease accounts for the majority of pediatric cases, but it is not the only possibility. Stress injuries, bone lesions, and other less common conditions can also cause heel pain in young athletes, so a child whose pain persists despite standard care or has unusual features warrants closer evaluation.14PubMed. Heel pain in young athletes – not always Sever’s Disease: A Narrative Review
Autoimmune and Inflammatory Causes
Not all heel pain comes from mechanical overuse. In spondyloarthritis, a family of autoimmune conditions that includes ankylosing spondylitis and psoriatic arthritis, the immune system targets the spots where tendons and ligaments attach to bone, known as entheses. The heel is the most frequently affected site, and the resulting enthesitis can be chronic and stubborn, often resisting the standard treatments that work for mechanical heel pain.15Annals of the Rheumatic Diseases. A randomised, multicentre, double-blind, placebo-controlled trial of etanercept in adults with refractory heel enthesitis in spondyloarthritis: the HEEL trial Ultrasound studies comparing spondyloarthritis patients with healthy controls consistently find more damage at the heel entheses in the affected group.16PubMed Central. Ultrasonography of heel entheses in axial spondyloarthritis patients: frequency and assessment of associated factors
If your heel pain is accompanied by stiffness in the lower back or other joints, especially morning stiffness lasting more than 30 minutes, or if you have a history of psoriasis, it is worth asking a clinician whether an inflammatory condition could be the driver. The treatment for immune-mediated enthesitis involves disease-modifying drugs rather than stretching and orthotics.
Metabolic Conditions That Set the Stage
Diabetes, high cholesterol, and obesity all raise the risk of tendon problems throughout the body, and the plantar fascia and Achilles tendon are no exception.17PubMed Central. The interplay between metabolic disorders and tendinopathies: Systematic review and meta-analysis In diabetes, persistently high blood sugar promotes the buildup of compounds that stiffen collagen, and this process has been linked to increased plantar fascia thickness, one of the hallmarks of fasciitis on imaging.18PubMed Central. Plantar fasciitis in patients with type 1 and type 2 diabetes: A contemporary cohort study Excess body weight compounds the problem by increasing the mechanical load through the heel with every step. For people dealing with recurrent heel pain, getting metabolic health checked is not just good general advice; it directly affects the tissue that is breaking down.
How Footwear and Surface Affect Your Heel
Shoes play a real role, though the relationship is more nuanced than “wear cushioned shoes and you’ll be fine.” Research on midsole hardness shows that softer shoe materials reduce the strain on the plantar fascia during running, lowering both stress and the amount the arch drops with each stride.19PubMed Central. Effects of Midsole Hardness on the Mechanical Response Characteristics of the Plantar Fascia during Running Pairing a softer midsole with a softer running surface amplifies the cushioning benefit, reducing loading rates more than either factor alone.20PubMed. Effect of midsole hardness and surface type cushioning on landing impact in heel-strike runners
For people who already have plantar heel pain, purpose-built footwear can make a noticeable difference. A study testing shoes designed for heel pain found that a supportive test shoe reduced heel peak pressure by about 15% and cut maximum loading rate by roughly 29% compared with a standard shoe, while also scoring substantially higher on comfort ratings. Adding a dual-density insert with arch contouring further lowered heel pressure by another 11–12%.21PubMed Central. Immediate Effects of Footwear Design on In-Shoe Plantar Pressures, Impact Forces and Comfort in Women With Plantar Heel Pain None of this means shoes alone cure heel pain, but the wrong pair can absolutely make things worse.
How Your Body Compensates for Heel Pain
When your heel hurts, you unconsciously change the way you walk. A systematic review of gait studies found that people with plantar heel pain spend less time loading the rearfoot and shift pressure to the midfoot and forefoot instead. They also reduce the peak force at toe-off and slow their overall stride timing.22PubMed. Gait deviations associated with plantar heel pain: A systematic review These compensations are your body’s attempt to protect the painful area, but they can create secondary problems up the chain: calf tightness, knee strain, or hip discomfort that seem unrelated until you trace them back to the original heel issue. Addressing the heel pain early can prevent these knock-on effects from becoming their own stubborn conditions.
When Heel Pain Becomes a Pain-System Problem
Most heel pain resolves within several months. When it does not, the nervous system itself may be part of the reason. Research on people with chronic plantar fasciitis has found that many show signs of central sensitization, where the brain and spinal cord amplify pain signals beyond what the tissue damage alone would predict. One study found that about 86% of chronic plantar fasciitis patients showed markers of central sensitization on a validated screening tool, compared with 44% of pain-free controls.23PubMed Central. Frequency of central sensitization and nociplastic pain in patients with plantar fasciitis Separately, another study found that people with one-sided heel pain had heightened pain sensitivity not just in the affected foot but throughout their body, in both legs and even in nerve trunks far from the heel.24PubMed. Widespread Pressure Pain Hypersensitivity in Musculoskeletal and Nerve Trunk Areas as a Sign of Altered Nociceptive Processing in Unilateral Plantar Heel Pain
This does not mean the pain is imaginary. It means the alarm system has been turned up, so stimuli that should feel mildly uncomfortable now register as genuinely painful. For people stuck in this cycle, treatments that only target the heel tissue may not be enough; approaches that address the nervous system, such as graded exercise, pain education, and sometimes medications that calm nerve sensitivity, become important additions.
First-Line Treatments That Work
For the majority of heel pain caused by plantar fasciitis or related mechanical issues, conservative measures resolve the problem. Stretching the calf muscles, Achilles tendon, and plantar fascia is one of the most consistently supported interventions. Orthotics, whether prefabricated or custom-molded, provide meaningful improvements in foot function, and research suggests that low-cost off-the-shelf insoles perform just as well as expensive custom versions for most people.25PubMed Central. Orthotics Compared to Conventional Therapy and Other Non-Surgical Treatments for Plantar Fasciitis Night splints, which hold the foot in a gently stretched position while you sleep, also show short-term pain relief. A study combining a temporary custom orthotic with a stretching program found that first-step heel pain and overall foot function improved within two weeks and maintained those gains through three months.26PubMed. The short-term effects of treating plantar fasciitis with a temporary custom foot orthosis and stretching
Shockwave Therapy Versus Steroid Injections
When conservative care falls short, two of the most commonly considered next steps are corticosteroid injections and extracorporeal shockwave therapy. Both work. A meta-analysis of randomized trials found that shockwave therapy and corticosteroid injections were each effective at relieving pain and improving function at three months, with no statistically significant difference between them overall.27PubMed Central. Comparison of efficacy of shock-wave therapy versus corticosteroids in plantar fasciitis: a meta-analysis of randomized controlled trials A separate analysis added a wrinkle: high-intensity shockwave therapy appeared to outperform injections in the short term, but low-intensity shockwave therapy was slightly inferior. Steroid injections also carried a tendency toward greater need for follow-up painkillers, while shockwave was associated with more local side effects like temporary soreness.28PubMed Central. Clinical effects of extracorporeal shock-wave therapy and ultrasound-guided local corticosteroid injections for plantar fasciitis in adults Recurrence rates and long-term functional outcomes were similar for both.
In practice, the choice often comes down to availability, cost, and individual preference. Steroid injections provide faster initial relief but carry a small risk of fat pad atrophy and plantar fascia rupture with repeated use. Shockwave therapy avoids those risks but requires multiple sessions and can be uncomfortable during treatment.
Conditions That Mimic Each Other
One of the most underappreciated aspects of heel pain is how many different problems produce overlapping symptoms. A short checklist of distinguishing features can help you and your clinician narrow things down:
- Location: Pain on the bottom of the heel, worst with the first morning steps, points to the plantar fascia. Pain at the back of the heel, worsened by pushing off, suggests the Achilles insertion. Pain along the inner side with burning or tingling raises the possibility of nerve entrapment.
- Squeeze test: Compressing the heel from both sides typically does not bother plantar fasciitis but can provoke a stress fracture.
- Systemic clues: Morning stiffness lasting over 30 minutes in the lower back, psoriasis, or pain that does not respond to rest may point toward an autoimmune enthesitis rather than a mechanical problem.
- Age and activity: A child or young teenager with activity-related heel pain likely has growth-plate irritation. A runner who recently increased mileage and has diffuse heel soreness may be developing a stress reaction in the bone.
Getting the diagnosis right matters because the treatments diverge sharply. Stretching and orthotics help a damaged fascia but do nothing for a pinched nerve. Anti-inflammatory drugs calm autoimmune enthesitis but will not rebuild an atrophied fat pad. Rest heals a stress fracture but may leave a case of central sensitization spinning in place. For heel pain that lingers beyond a couple of months or does not fit the textbook pattern, pushing for more specific evaluation saves time and frustration.