Dozens of conditions can produce heel pain that looks and feels a lot like plantar fasciitis but stems from an entirely different structure. Nerve entrapments, stress fractures, fat pad deterioration, Achilles tendon problems, bone abnormalities, and even medications can all land pain squarely in the heel. Because plantar fasciitis dominates the conversation, these other causes are regularly misdiagnosed or overlooked, sometimes for months.
Heel Fat Pad Damage and Atrophy
The fat pad on the bottom of your heel acts as a built-in shock absorber. When it deteriorates or gets injured, the pain sits right under the heel and can feel nearly identical to plantar fasciitis. The difference is subtle but important: fat pad pain tends to be more diffuse across the heel, while plantar fasciitis typically hurts in a focused spot near the front-inside edge of the heel bone.
Fat pad problems fall into two camps. Acute damage can happen from a single hard landing, like jumping off a wall or missing a step. Chronic breakdown, on the other hand, comes from repetitive impact over time. Running on hard surfaces, excessive jumping, and simply walking a lot on concrete all wear the pad down gradually. Age, obesity, diabetes, and rheumatological conditions are also linked to fat pad atrophy.1PubMed Central. What do we actually know about a common cause of plantar heel pain? A scoping review of heel fat pad syndrome Older adults and people with diabetes are especially prone because the fat pad thins naturally with age and metabolic changes can accelerate the process.
One clue that the fat pad is the problem rather than the fascia: pressing the center of the heel itself usually reproduces the pain, whereas plantar fasciitis tends to hurt most when you stretch or press the arch-side attachment of the fascia. Heel pad pain also doesn’t follow the classic “worst with the first steps of the morning” pattern quite as reliably.
Achilles Tendinopathy
Pain at the back of the heel, rather than the bottom, often points to the Achilles tendon. Achilles tendinopathy comes in two forms based on where the trouble sits. Insertional tendinopathy affects the spot where the tendon anchors into the heel bone, and noninsertional tendinopathy hits the midsection of the tendon a few centimeters above the heel.2PubMed Central. Achilles Tendinopathy: Current Concepts about the Basic Science and Clinical Treatments The insertional type is the one most likely to be confused with other heel conditions because the pain centers on the heel bone itself.
Treatment outcomes differ between the two types. In one comparative study, patients with the noninsertional form were more likely to see meaningful improvement in physical function than those with the insertional form.3PubMed. A Comparative Analysis of Clinical Outcomes in Noninsertional Versus Insertional Tendinopathy Using PROMIS That matters practically: if your heel pain turns out to be insertional Achilles tendinopathy, recovery may take longer and require more targeted treatment than you’d expect from general advice about Achilles problems.
Haglund’s Deformity
Sometimes the heel bone itself is the problem. Haglund’s deformity is a bony enlargement at the back of the calcaneus, right where the Achilles tendon attaches. The bump isn’t always painful on its own, but when rigid shoes press against it, the overlying soft tissue becomes irritated and inflamed.4PubMed Central. Haglund’s Syndrome: A Commonly Seen Mysterious Condition This is why Haglund’s deformity picked up the nickname “pump bump,” after the rigid heel counters of women’s pumps that tend to aggravate it.5PubMed. The Haglund syndrome: initial and differential diagnosis
The deformity frequently shows up alongside retrocalcaneal bursitis, which is inflammation of the small fluid-filled sac that sits between the Achilles tendon and the heel bone. Together, the bony prominence plus the bursitis plus tendon thickening make up what clinicians call Haglund’s syndrome.6Orthopedic Clinics of North America. Haglund’s Deformity and Retrocalcaneal Bursitis If you notice a visible bump at the back of your heel that gets worse in stiff-backed shoes, this combination is a strong possibility.
Nerve Entrapments That Mimic Plantar Fasciitis
Nerve problems in the foot are one of the most commonly missed causes of heel pain because the location of the pain overlaps so closely with plantar fasciitis. Two entrapments deserve special attention.
Baxter’s nerve entrapment involves compression of the first branch of the lateral plantar nerve, a small nerve that runs along the inner side of the heel. It causes chronic, burning pain in the medial plantar heel and is frequently misdiagnosed as plantar fasciitis, which leads to treatments that don’t address the actual problem.7PubMed. Baxter’s nerve: the hidden culprit of chronic heel pain The giveaway is often the quality of the pain: burning, tingling, or numbness mixed with the aching, rather than the purely mechanical sharp-stab feeling of fascia irritation.
Tarsal tunnel syndrome is a broader entrapment where the tibial nerve or one of its branches gets compressed in the tarsal tunnel on the inner side of the ankle. The result is numbness, burning, and painful tingling that can radiate into the heel, ankle, and sole of the foot.8PubMed Central. An Update on Posterior Tarsal Tunnel Syndrome If your heel pain is accompanied by electrical or burning sensations rather than just stiffness and aching, a nerve entrapment should be on the shortlist of suspects.
Calcaneal Stress Fractures
The heel bone bears a huge share of your body weight with every step, and it can develop small stress fractures from repetitive loading. These fractures are notoriously hard to catch early. Initial X-rays often look completely normal, and the pain can be chalked up to soft tissue problems for weeks before imaging finally reveals the fracture. In one reported case, a woman’s stress fracture wasn’t found until persistent pain prompted an MRI after standard X-rays showed nothing.9PubMed Central. Delayed Diagnosis of Calcaneal Stress Fracture: A Case Report
A telling clinical sign is the “squeeze test”: if squeezing the sides of the heel reproduces your pain, a stress fracture becomes more likely. All patients in one series of calcaneal stress fractures reported pain on walking, and the fracture was confirmed by squeezing the calcaneus. Swelling and warmth were present in some but not all cases, and osteoporosis was a common underlying factor.10Journal of Bone and Joint Surgery. Calcaneal Stress Fracture: An Adverse Event Following Total Hip and Total Knee Arthroplasty Athletes in running and jumping sports are at higher risk, but so are older adults with weakened bones and people recovering from lower-limb surgery who suddenly increase their walking.
Sever’s Disease in Children and Adolescents
If the person with heel pain is between roughly eight and fifteen years old, the most likely diagnosis isn’t plantar fasciitis at all. Sever’s disease, or calcaneal apophysitis, is the leading cause of heel pain in that age range.11Advanced Emergency Nursing Journal. Sever’s Disease (Calcaneal Apophysitis) It involves irritation of the growth plate at the back of the heel bone, and it’s generally considered an overuse injury from repetitive stress on that still-developing area. The pain can affect one heel or both.12PubMed Central. Sever’s Disease of the Pediatric Population: Clinical, Pathologic, and Therapeutic Considerations
Kids who play sports with lots of running and jumping are classic candidates, and the condition tends to flare during growth spurts. The good news is that Sever’s disease is self-limiting. Once the growth plate fuses, which happens in the mid-to-late teen years, the problem resolves on its own. In the meantime, reducing activity, heel cups, and stretching usually manage the symptoms. Parents who assume their active child has “the same plantar fasciitis” as an adult are likely looking at the wrong diagnosis.
Pain Referred from the Spine
Heel pain doesn’t always originate in the heel. Lumbar radiculopathy, commonly called sciatica, can send pain, pressure changes, and dysfunction all the way down to the foot. Research comparing patients with chronic lumbar disc herniation to healthy controls found that sciatica patients experienced higher mean and peak pressures across most zones of the foot, along with significant foot pain and foot-related disability.13PubMed. Foot pressure in patients with chronic lumbar radicular pain (sciatica) caused by lumbar disc herniation: a case-control observational study In other words, a pinched nerve in your lower back can make your heel genuinely hurt, not just in a vague referred way but with measurable changes in how your foot handles pressure.
This is worth keeping in mind if your heel pain doesn’t respond to any of the standard local treatments and you also have low back symptoms, shooting pain down the leg, or numbness anywhere in the calf or foot. Treating the heel will never solve a problem that starts in the spine.
Autoimmune and Inflammatory Conditions
Spondyloarthropathies, a family of inflammatory conditions that includes psoriatic arthritis and ankylosing spondylitis, have a particular fondness for attacking entheses, the spots where tendons and ligaments attach to bone. The heel is packed with entheses, and inflammation there (enthesitis) can produce stubborn heel pain that looks superficially like plantar fasciitis. The ACHILLES trial specifically studied patients with psoriatic arthritis or axial spondyloarthritis who had clinical and MRI-confirmed heel enthesitis that hadn’t responded to standard treatments.14PubMed Central. Magnetic resonance imaging characteristics in patients with spondyloarthritis and clinical diagnosis of heel enthesitis
If you have heel pain that persists for months despite rest and typical interventions, and you also experience morning stiffness in your back, swollen fingers or toes, or skin changes suggestive of psoriasis, an inflammatory condition could be the root cause. The treatment approach is fundamentally different, often involving systemic medications rather than stretches and orthotics.
Medication-Induced Tendon Problems
Certain common medications can damage tendons, including the Achilles, and produce heel pain as a side effect. Fluoroquinolone antibiotics like ciprofloxacin are the most notorious culprits, and tendon damage can appear as soon as 48 hours into treatment or even months after the medication has been stopped. The damage is sometimes prolonged, disabling, and irreversible. Statins can also cause tendinopathy, typically appearing around eight to ten months after starting the drug and at any dose. Long-term glucocorticoids and aromatase inhibitors round out the list of medications most commonly associated with tendon problems.15Medsafe. Drug-induced tendinopathy
This is an underappreciated cause. People who develop new heel or ankle tendon pain shortly after starting one of these medications, or even months later in the case of statins, should flag it with their prescriber. Continuing the medication while the tendon deteriorates can worsen the outcome.
Plantar Fascia Rupture
Ironically, one cause of heel pain that isn’t plantar fasciitis is a plantar fascia that has actually torn. Ruptures can happen spontaneously or as a complication of corticosteroid injections used to treat fasciitis. In one case series, about two-thirds of patients with a plantar fascia rupture following steroid injection reported a sudden tearing sensation at the heel, while the remaining third had a more gradual onset of symptoms.16PubMed. Complications of plantar fascia rupture associated with corticosteroid injection A ruptured fascia changes the foot’s biomechanics entirely and often shifts pain to new areas, including the lateral foot, the arch, or higher up the leg as the body compensates.
Tarsal Coalitions
A tarsal coalition is an abnormal bridge of bone, cartilage, or fibrous tissue connecting two bones in the back of the foot that should move independently. They affect up to about one in eight people and can cause chronic ankle and hindfoot pain.17PubMed Central. Tarsal Coalitions: Radiographic, CT, and MR Imaging Findings Many coalitions are asymptomatic and never discovered, but when they do cause trouble, they restrict normal foot motion, alter how forces travel through the heel, and can even predispose the nearby bones to stress injuries.18PubMed. Bone stress injuries in the presence of tarsal coalition as a cause of hindfoot pain in adolescents: case series of 6 patients with literature review In adolescents with persistent hindfoot pain that doesn’t fit other diagnoses, imaging for a coalition is worth considering.
Calcaneal Osteomyelitis
Bone infections in the heel are uncommon in the general population but not rare in certain groups. A systematic review of over a thousand cases found that injury-related infections and diabetic foot infections were the two most common pathways to calcaneal osteomyelitis. Ulcers and wound drainage were the most frequent presenting signs, and the bacterium Staphylococcus aureus was the pathogen found most often.19PubMed Central. Clinical characteristics, treatment and efficacy of calcaneal osteomyelitis: a systematic review with synthesis analysis of 1118 reported cases If you have diabetes or a history of heel wounds and develop deep, persistent heel pain with warmth and swelling, infection of the bone itself is a possibility that warrants urgent evaluation.
Bone Tumors and Cysts of the Calcaneus
Tumors in the heel bone are rare, but they do exist. Simple bone cysts and intraosseous lipomas are the most common benign lesions, and they are often found incidentally on imaging done for other reasons. When they do produce symptoms, the main complaint is vague heel pain. In uncommon cases, they weaken the bone enough to cause a pathological fracture.20PubMed Central. Allogenic Cancellous Bone versus Injectable Bone Substitute for Endoscopic Treatment of Simple Bone Cyst and Intraosseous Lipoma of the Calcaneus and Is Intraosseous Lipoma a Developmental Stage of a Simple Bone Cyst? Intraosseous lipomas tend to appear on X-ray as a well-defined lytic lesion, often near the base of the calcaneus neck, sometimes with central calcifications.21PubMed Central. Primary tumours of the calcaneus These are not diagnoses most people need to worry about, but they illustrate why persistent, unexplained heel pain sometimes deserves advanced imaging.
Vascular Causes
Poor blood flow to the foot can produce heel pain with a different pattern than musculoskeletal causes. Ischemic pain from peripheral vascular disease tends to affect the tips of the toes or the heel, is typically worse when the foot is elevated, and often bothers people most at night.22PubMed. Evaluation of patients with peripheral vascular disease That nighttime and elevation pattern is essentially the opposite of plantar fasciitis, which hurts most during weight-bearing. If your heel pain is at its worst when you’re lying in bed with your feet up, a vascular evaluation is warranted, especially if you smoke or have cardiovascular risk factors.
How These Conditions Get Sorted Out
Given the long list of possibilities, a clinical exam is the starting point. Where exactly the pain sits, what makes it worse, what time of day it peaks, and whether there are neurological symptoms like tingling all help narrow the field. A clinician can often distinguish fat pad pain from fascial pain from nerve entrapment based on the location and character of the tenderness alone.23PubMed. Diagnosing heel pain in adults
When the clinical picture is unclear, ultrasound is usually the first imaging step. It’s fast, inexpensive, and widely available, and newer techniques like shear wave elastography have pushed its accuracy even higher. One comparative study found that adding shear wave elastography to standard ultrasound raised diagnostic accuracy to above 93% for plantar fasciitis and nearly 98% for Achilles tendinopathy.24PubMed Central. Ultrasound imaging and shear wave elastography for the differential diagnosis of heel pain: a comparative cross-sectional study MRI remains the gold standard when stress fractures, bone lesions, or deep soft tissue pathology are suspected, particularly since standard X-rays miss early stress fractures entirely.
The broader practical point is this: if your heel pain hasn’t improved after several weeks of the usual plantar fasciitis measures like stretching, icing, and arch support, the diagnosis itself may be wrong. Pushing for further evaluation rather than repeating the same failed treatments is often the fastest route to getting better.