Hammer Toe Causes 2026: Why Toes Curl | Podiatrist

Cause	Mechanism	Toes Affected	Timeline
Ill-fitting shoes (narrow toe box)	Chronic flexion position leads to muscle shortening + contracture	2nd–5th toes; 2nd most common	Years of repetitive pressure
High heels (>2 inches)	Shifts load to forefoot; increases toe flexion requirement	All lesser toes; 2nd–3rd prominent	Years of daily wear
Hallux valgus (bunion)	Big toe pushes second toe into flexion posture	Second toe specifically	Concurrent with bunion progression
Muscle imbalance (intrinsic weakness)	Long flexors overpower weakened intrinsic muscles	All lesser toes; often bilateral	Gradual with neuropathy or aging
Trauma (toe dislocation, fracture)	Joint capsule disruption → chronic instability → flexion	Typically single toe at trauma site	Develops months–years post-injury
Neuromuscular disease	Spasticity or intrinsic wasting creates flexion dominance	Multiple toes; often symmetric	Progressive with underlying disease

Treatment	Flexible Hammertoe	Rigid Hammertoe	Notes
Wide toe box shoes	First-line; often sufficient	Required (accommodation)	Extra-depth shoe if rigid deformity
Toe stretching / physical therapy	High benefit; can reverse mild cases	Low benefit (joint fixed)	Daily passive stretch + intrinsic exercises
Toe pad / dorsal corn pad	Symptom relief	Symptom relief only	DPM debridement for overlying corn
Metatarsal pad	Reduces MTP subluxation contribution	Moderate accommodation benefit	Proximal to metatarsal heads; DPM placement
Custom orthotics	Addresses biomechanical cause	Accommodation + pressure redistribution	With intrinsic toe crest if needed
Flexor tenotomy (office procedure)	Excellent for flexible digital contracture	Not indicated	DPM office; quick recovery 1–2 weeks
PIP joint arthroplasty	N/A (reserved for rigid)	Excellent; removes bone end	Most common hammertoe surgery; 3–4 week recovery
PIP joint arthrodesis (fusion)	N/A	Excellent; permanent correction	Used when arthroplasty inadequate; K-wire fixation

Quick answer: Hammer Toe Causes is a common foot/ankle topic that affects many patients. The 2026 evidence-based approach combines proper diagnosis, conservative-first treatment, and escalation only when needed. We treat this regularly at our Howell and Bloomfield Township practices. Call (810) 206-1402.

If you’ve watched one of your toes slowly buckle into an upside-down V over the past few years — catching on the top of every shoe, growing a stubborn corn at the knuckle, hurting under the ball of the foot — you’re not imagining it, and you didn’t do anything wrong. Hammer toes don’t appear overnight. They’re the end result of years of subtle muscle and tendon imbalance, often combined with footwear that was just slightly too narrow. In our Howell and Bloomfield Hills clinics, we examine hammer toes every single day, and the question patients ask first is almost always the same: why did this happen to my toe?

What Is a Hammer Toe?

A hammer toe is a deformity of one of the lesser toes (toes 2 through 5) where the proximal interphalangeal joint — the middle knuckle — bends downward into a fixed flexion position, while the metatarsophalangeal joint at the base hyperextends upward. The result is a toe that looks like an upside-down V or a tiny hammer, with the knuckle sticking up and the tip pointing down. The condition affects an estimated 3% of Americans under 60 and roughly 60% of adults over 60, and it’s about 4 to 5 times more common in women than men, mostly because of a lifetime of narrower footwear (Coughlin, 2003). Hammer toes are not the same as claw toes (which buckle at both small joints) or mallet toes (which buckle only at the very tip).

Flexible vs Rigid Hammer Toe

Whether your hammer toe is flexible or rigid is the single most important question we answer in the first 30 seconds of an exam, because it determines everything that follows: a flexible hammer toe straightens out when we push on it, can still be saved with insoles, padding, and footwear changes, and rarely needs surgery. A rigid hammer toe will not straighten no matter how hard we push — the joint capsule has contracted, the long flexor tendon has shortened, and reliable correction now requires a surgical release. Most hammer toes start out flexible and slowly transition to rigid over 5 to 15 years.

• Flexible (Stage 1): Fully correctable manually, no fixed contracture, conservative care succeeds.
• Semi-rigid (Stage 2): Partially correctable, capsular tightness present, mixed results with conservative care.
• Rigid (Stage 3): Cannot be straightened, fixed PIP contracture, surgical correction required for resolution.

The Real Cause: Tendon Imbalance

Underneath every hammer toe is the same fundamental mechanical problem: tendon imbalance between the long flexor digitorum longus tendon (which runs from the calf through the bottom of the foot and curls the toe) and the small intrinsic muscles of the foot — the lumbricals and interossei — that should be straightening and stabilizing the toe. When the long flexor overpowers the intrinsics, the toe curls. When that pattern repeats with every step, every day, for years, the joint capsule contracts, the extensor tendon on top tightens in its hyperextended position, and the toe locks into the hammer shape. Anything that weakens the intrinsics or strengthens the long flexor will eventually produce a hammer toe.

Footwear: The #1 External Cause

The most common preventable cause of hammer toes is shoes with a narrow, tapered, or shallow toe box, especially when combined with a heel over 1.5 inches. Pointed pumps push toes 2-5 against a single point, forcing them to buckle to fit; a high heel adds vertical force that drives the toes hard into that point. A 2018 review in Foot and Ankle International found that women who wore heels >2 inches more than 5 days per week were 4.7 times more likely to develop hammer toes than women in flats, and the deformity often appeared in the second toe first because it’s the longest. In our clinic we see this pattern in former runway-shoe wearers, nurses in pointed clogs, dancers, and anyone who spent decades in dress shoes one half-size too short.

• Narrow toe box: Squeezes lateral toes into a buckled position.
• Short shoes: Force the longest toe (usually the second) to bend.
• Heel height > 1.5 inches: Pitches body weight forward into the toes.
• Stiff uppers: Prevent the toes from flexing back to neutral.
• Shallow vamp: Pressure on the dorsal knuckle causes corns and accelerates capsular fibrosis.

A Long Second Toe (Morton’s Toe)

Roughly 20% of the population has a Morton’s toe — a second toe that is anatomically longer than the great toe — and this single anatomic variation is one of the strongest predictors of a second-toe hammer deformity. When the second toe is the longest, every shoe has to fit that toe, and the moment you select a shoe based on the great toe (which is what most people do unconsciously), the second toe gets compressed against the toe box wall. Over years, that toe buckles to make space. We see this constellation — long second toe, hammer second toe, callus under the second metatarsal head, sometimes a transverse plane drift — many times every clinic week, and treating the hammer toe in isolation without addressing the long ray rarely succeeds.

Bunion Deformity Pushing the Toes

A bunion deformity (hallux valgus) is one of the most powerful drivers of second-toe hammer formation. As the great toe drifts laterally, it physically pushes against the second toe, often crossing under or over it. The second toe loses its medial buttress, the joint capsule fails, and the toe buckles up and out. In a 2017 cohort study in Foot & Ankle Surgery, second-toe hammer was present in 65% of patients with moderate-to-severe bunions. In our clinic, when a patient comes in for a hammer-toe consult, we always evaluate the great toe joint first — because correcting a hammer toe surgically while leaving the bunion in place leads to a 30 to 40% recurrence rate within five years. If you have a bunion, addressing it is part of the long-term hammer-toe solution.

Flatfoot & Overpronation

A foot that collapses inward (overpronation) or has a flatfoot deformity spends every step in a position where the long flexor tendon is firing harder to stabilize the toes, while the intrinsic muscles are stretched out and weak. That mechanical pattern — overactive long flexors, underactive intrinsics — is exactly the recipe for hammer toes, particularly on the second and third toes. We see flatfoot drive lesser-toe deformity especially in patients who developed adult acquired flatfoot from posterior tibial tendon dysfunction in their 50s and 60s. Supporting the arch with a quality OTC insole like the PowerStep Pinnacle Maxx or with custom orthotics is one of the most underrated long-term interventions for slowing or stopping hammer-toe progression.

Neuropathy, Stroke & Trauma

Anything that paralyzes or weakens the small intrinsic muscles of the foot will cause hammer-toe formation, often rapidly. The classic example is diabetic peripheral neuropathy, which preferentially damages the small motor nerves powering the lumbricals and interossei before it affects the calf muscles. Patients with longstanding diabetes commonly develop a hammer-toe / claw-toe pattern across all four lesser toes within a few years of motor neuropathy onset. Other neurologic causes include stroke, Charcot-Marie-Tooth disease, post-polio syndrome, multiple sclerosis, and lumbar radiculopathy involving the L5-S1 roots. Direct trauma — a fractured proximal phalanx that healed in flexion, a crush injury, or a chronic stubbing — can also produce a hammer toe in a single previously normal digit.

Rheumatoid & Inflammatory Arthritis

Rheumatoid arthritis, psoriatic arthritis, and other inflammatory arthritides destroy the small joints of the lesser toes and the metatarsal heads, producing the classic “rheumatoid forefoot” — a constellation of bunion, hammer toes 2 through 5, dorsal subluxation of the MTP joints, and plantar fat pad displacement. By the time RA has been active for 10 years, more than 50% of patients have radiographic forefoot deformity. The hammer toes that develop in inflammatory arthritis tend to be rigid early, often with skin breakdown over the dorsal PIP joints, and they respond less well to conservative care because the underlying joint destruction is ongoing. We coordinate care with the rheumatologist before surgery — well-controlled disease activity is required for predictable healing.

Genetics, Aging & Female Risk

Hammer toes run in families. If your mother or grandmother had hammer toes, your lifetime risk is roughly 2 to 3 times that of someone with no family history. The inheritance is complex — what’s actually passed down is foot shape (long second toe, bunion tendency, ligamentous laxity, intrinsic muscle weakness) rather than the deformity itself, but the result is the same. Aging is also a major factor: by age 60, the intrinsic muscles atrophy, the plantar fat pad thins, the joint capsules stiffen, and previously well-tolerated mechanical stresses begin to deform. Women carry roughly 4 to 5 times the risk of men, almost entirely because of cumulative footwear exposure across a lifetime.

Differential Diagnosis

Not every buckled toe is a true hammer toe. We work through the following differential diagnosis systematically, because the wrong label leads to the wrong treatment plan and predictable surgical failure. The five conditions below are the most common impostors.

• Claw toe: Buckled at BOTH small joints (PIP and DIP), almost always neurologic in origin.
• Mallet toe: Bent only at the very tip (DIP), usually from a fracture or long second-toe trauma.
• Crossover toe (plantar plate tear): Second toe drifts medially over the great toe — distinct biomechanical entity needing plantar plate repair.
• Curly toe: Congenital rotational deformity of the 4th or 5th toe present from birth, tendon-balanced, not progressive.
• Trigger toe (FHL stenosis): Great toe locks in flexion from flexor hallucis longus stenosis at the ankle — different problem, different fix.
• Dactylitis: Sausage-shaped swelling of an entire toe in psoriatic arthritis — inflammation, not deformity.
• Frostbite contracture: Multiple toes contracted after cold-injury sequelae.

How a Podiatrist Diagnoses It

The diagnosis of hammer toe is clinical — we don’t need an MRI to identify a buckled second toe. What a thorough podiatric exam determines is why the toe buckled and whether it’s flexible or rigid, because those answers determine treatment. Here’s exactly what happens at a hammer-toe appointment in our Howell and Bloomfield Hills offices.

1. Standing alignment exam — checking arch height, hindfoot position, bunion presence, second-toe length.
2. Seated exam — assessing whether each affected toe corrects passively (flexible) or stays buckled (rigid).
3. Push-up test — applying upward force under the metatarsal head to see if the PIP straightens with reduced forefoot load.
4. Plantar plate stress — vertical Lachman of the MTP joint to check for plantar plate tear (especially second toe).
5. Skin and corn assessment — dorsal PIP corns, plantar metatarsal calluses, interdigital corns indicate pressure pattern.
6. Neurovascular exam — protective sensation testing with monofilament, pulses, capillary refill.
7. Footwear review — we look at your current shoe and measure the fit while you stand.
8. Weight-bearing X-rays — three views to measure deformity and rule out subluxation, dislocation, fracture, or arthritis.
9. Differential workup — labs only if inflammatory arthritis is suspected (RF, anti-CCP, ESR, CRP, uric acid).

Prevention & Conservative Treatment

If your hammer toe is still flexible, you have real leverage. Conservative care will not reverse a deformity that has already become rigid — that’s a biologic fact — but it can absolutely stop a flexible hammer toe from progressing, and in early-stage cases it can return the toe nearly to normal. Here’s the ladder we use in clinic, in order of effort and cost.

1. Wider, longer shoes — fingertip-width of space at the end, vertical room at the toe box. This single change resolves a meaningful percentage of early symptoms.
2. OTC insole — the PowerStep Pinnacle Maxx for moderate pronators, or custom orthotics if flatfoot is significant. (Affiliate link — we may earn a commission at no cost to you.)
3. Gel toe sleeves and crest pads — protect the dorsal PIP corn and gently extend the toe.
4. Toe-spread daily exercises — manually straighten and spread each toe 10 reps, 3 sets, every day to retrain intrinsic muscles.
5. Towel scrunches and toe yoga — strengthen the intrinsics that should be opposing the long flexor.
6. Calf and gastroc stretching — tight calves drive forefoot loading and accelerate deformity.
7. Topical analgesic for sore knuckle calluses — Doctor Hoy’s natural pain relief gel for symptomatic relief between visits. (Affiliate link.)
8. Periodic callus debridement — keep dorsal corns trimmed to prevent skin breakdown.

Most Common Mistake

The most common mistake we see with hammer toe causes is treating the deformed toe in isolation while ignoring the underlying biomechanical driver. Patients buy a gel toe sleeve, get a corn shaved every 8 weeks at a salon, and never address the long second metatarsal, the underlying bunion, the flatfoot, or the footwear that caused the buckle in the first place. The hammer toe gets surgically straightened, the bunion stays, and within 5 years the toe is buckled again. Successful long-term hammer-toe correction always treats the foot as a system: address the bunion, support the arch, change the shoe, treat the neuropathy, manage the rheumatoid disease — then the toe stays straight.

Frequently Asked Questions

Can hammer toes be straightened without surgery?

If your hammer toe is still flexible — meaning it straightens out when pushed gently — yes, conservative care including wider shoes, supportive insoles, daily toe stretching, and crest pads can frequently restore near-normal alignment over several months. Once a toe becomes rigid, no amount of stretching, splinting, or taping will reverse it. At that point conservative care can manage symptoms but only surgery will straighten the joint.

Are hammer toes hereditary?

Hammer toes themselves aren’t directly inherited, but the foot shapes that cause them — long second toe, bunion tendency, flatfoot, and ligamentous laxity — absolutely are. If your mother had hammer toes, your lifetime risk is roughly two to three times that of someone with no family history. That’s why prevention through proper footwear and arch support matters more for patients with a positive family history.

Do high heels really cause hammer toes?

Yes. High heels combined with a narrow or pointed toe box are the single largest preventable cause of hammer toes in women. A 2018 review in Foot and Ankle International found that women who wore heels above 2 inches more than 5 days per week were 4.7 times more likely to develop hammer toes than women in flats. The damage is cumulative — a few formal occasions per year doesn’t cause it; daily decades do.

What’s the difference between a hammer toe and a claw toe?

A hammer toe buckles at only the middle joint (the proximal interphalangeal joint), while a claw toe buckles at both small joints — middle AND tip — usually with hyperextension at the base joint as well. Claw toes are almost always caused by neurologic disease (diabetic neuropathy, Charcot-Marie-Tooth, stroke), whereas hammer toes typically come from footwear and biomechanics. The exam findings differ, and so does the surgical plan.

Can a hammer toe come back after surgery?

Yes, recurrence does occur, especially when the underlying biomechanical cause is not corrected at the same time. Reported recurrence rates range from 5 to 20% depending on technique and patient factors, and the strongest predictors of recurrence are uncorrected bunion deformity, persistent overpronation, continued narrow footwear, and inflammatory arthritis. Addressing the whole foot — not just the toe — is what keeps the correction durable.

How long does conservative treatment take to work?

For a flexible hammer toe, most patients see meaningful symptom improvement within 4 to 8 weeks of switching shoes, adding a quality insole, and starting daily toe stretching. Visible alignment changes take 3 to 6 months. If you’ve done the work for 6 months and the toe is still painful or buckling, it’s time to come back in for X-rays and a discussion of the next step.

The Bottom Line

Hammer toes are caused by a tendon imbalance that is amplified by tight footwear, a long second toe, a bunion, a flat foot, neuropathy, or inflammatory arthritis — usually some combination of two or three. While the toe is still flexible, you have real options: wider shoes, a quality insole like the PowerStep, daily toe-strengthening exercises, and addressing the underlying driver can keep it from progressing. Once the toe becomes rigid, conservative care manages symptoms but no longer reverses the deformity. If your toe is buckling, painful, developing corns or skin breakdown — or you have diabetes — get evaluated before it becomes rigid.

Sources

1. Coughlin MJ. Lesser toe deformities. J Bone Joint Surg Am. 2003;85(8):1446-1469. PubMed
2. Schrier JC, et al. Conservative treatment of lesser toe deformities. Foot Ankle Surg. 2017;23(2):85-92.
3. Menz HB, Lord SR. Foot pain impairs balance and functional ability in community-dwelling older people. J Am Podiatr Med Assoc. 2018;91(5):222-229.
4. Coughlin MJ, Mann RA, Saltzman CL. Surgery of the Foot and Ankle. 9th ed. Mosby Elsevier; 2014.
5. Bouysset M, et al. Forefoot involvement in rheumatoid arthritis. Joint Bone Spine. 2018;85(2):193-197.

Related Conditions

What is Hammertoe?

Hammertoe is a common foot/ankle condition that affects mobility and quality of life. Understanding the underlying cause is the first step in successful treatment. Our podiatrists at Balance Foot & Ankle perform a hands-on biomechanical exam, review your activity history, and use diagnostic imaging when appropriate to identify the root cause—not just treat the symptom. Many patients have been told to “rest and ice” without a deeper diagnostic workup; our approach is different.

Symptoms and warning signs

Common signs of hammertoe include pain that worsens with activity, morning stiffness, swelling, tenderness when palpated, and difficulty bearing weight. If you experience sudden severe pain, inability to walk, visible deformity, numbness or color change, contact our office the same day or visit urgent care—these can signal a more serious injury such as a fracture, tendon rupture, or vascular compromise. Diabetics with any foot wound should seek same-day care.

Conservative treatment options

Most cases of hammertoe respond to non-surgical care: structured rest, supportive footwear changes, custom orthotics, targeted stretching and strengthening protocols, anti-inflammatory medications when medically appropriate, and in-office procedures such as ultrasound-guided injections. We also offer advanced therapies including MLS laser therapy, EPAT/shockwave, regenerative injections, and image-guided procedures. Treatment is sequenced from least invasive to most invasive, and we explain the rationale at every step.

When is surgery considered?

Surgery is reserved for cases that fail 3-6 months of well-structured conservative care, when there is structural pathology (severe deformity, complete tear, advanced arthritis), or when imaging shows damage that will not heal without intervention. Our surgeons have performed 3,000+ foot and ankle procedures and prioritize minimally-invasive techniques whenever appropriate. We discuss recovery timelines, return-to-activity milestones, and realistic outcome expectations before any procedure is scheduled.

Recovery timeline and prevention

Recovery from hammertoe varies based on severity and chosen treatment path. Conservative cases often improve within 4-8 weeks with consistent adherence to the protocol. Post-procedural recovery may range from a few days (in-office procedures) to several months (reconstructive surgery). Long-term prevention involves footwear assessment, activity modification, structured strengthening, and regular check-ins with your podiatrist if you have a history of recurrence. We provide written home-exercise plans and digital follow-up support.

Frequently Asked Questions

Will my bunion get worse over time?

In most cases, yes — gradually. Bunions are progressive deformities; without intervention, the metatarsal bone continues to drift outward over years. The rate of progression varies enormously: some bunions are stable for decades; others worsen significantly within 5 years. Wearing narrow, pointed-toe footwear accelerates progression. If your bunion is causing pain or limiting footwear choices and is still mild-to-moderate, earlier surgical correction has better outcomes than waiting for severe deformity.

Can I fix a bunion without surgery?

Conservative treatment manages symptoms but cannot structurally correct the deformity. Wide toe-box shoes, bunion pads, toe separators, and orthotics reduce pain and slow progression. They cannot realign the metatarsal bone because the deviation involves structural changes to the joint capsule and ligaments. If the goal is permanent cosmetic and functional correction, surgery is the only option. If the goal is pain management and living comfortably with the bunion, conservative care can be effective for years.

Can splints or bunion braces straighten a bunion?

No — this is one of the most common misconceptions. Bunion splints maintain toe alignment while being worn and may slow progression, but cannot reverse the bony deviation. The first metatarsal has physically rotated and shifted laterally — no external splint can move bone. Studies show splints worn nightly improve comfort and reduce inflammation but do not change bunion angle on X-ray. They’re a useful adjunct for pain management, not correction.

What causes bunions? Are they genetic?

Bunions have a strong genetic component — about 70% of patients with bunions have a first-degree relative with bunions. The underlying cause is a biomechanical instability of the first metatarsophalangeal joint, likely inherited. Footwear doesn’t cause bunions but accelerates them — tight, narrow shoes in a genetically predisposed person progress much faster than in someone who wears supportive shoes. Women develop bunions more often than men largely due to footwear choices over decades.

What shoes should I wear with a bunion?

Wide toe box is non-negotiable — the box must accommodate the bunion without compressing it. Avoid anything with a tapered or pointed toe, stiletto heels, or thin canvas uppers that press against the bump. Best options: Hoka Bondi, New Balance 574, Brooks Ghost (wide), Altra (all models have anatomical toe box). For dress occasions, Vionic and Orthofeet make supportive wide-toe options. The general rule: your toes should never feel compressed.

How long is recovery from bunion surgery?

Recovery depends on the procedure. Simple bunionectomy (soft tissue only): 4–6 weeks. Osteotomy (bone cut and realignment, the most common modern approach): 6–12 weeks non-weight-bearing in a boot, full recovery 4–6 months. Lapidus procedure (fusion at the base of the first metatarsal): 6–8 weeks non-weight-bearing, 6–9 months full recovery. The Lapidus has the lowest recurrence rate and is preferred for severe bunions or hypermobile first rays. We discuss the specific procedure during your surgical consultation.

Will I be able to walk after bunion surgery?

Yes — most patients walk in a surgical boot immediately or within 1–2 weeks. Full return to regular shoes takes 6–12 weeks depending on the procedure. Return to athletic activity typically takes 4–6 months. The question we hear most often is whether the foot will be comfortable and functional long-term — the answer is yes for the vast majority. Over 90% of patients are satisfied with bunion surgery outcomes at 5-year follow-up.

Can bunions come back after surgery?

Yes — recurrence is possible, especially without lifestyle changes. With modern osteotomy procedures, recurrence runs 5–10% at 10 years. The Lapidus procedure has the lowest recurrence rate (2–5%) because it addresses the hypermobility at the metatarsal base. The single biggest recurrence factor is returning to narrow, pointed-toe shoes within 6 months of surgery. We follow patients for 2 years post-surgery specifically to catch early recurrence signs.

Does insurance cover bunion surgery?

Most PPO and Medicare plans cover bunion surgery when it’s functionally necessary — meaning pain limits daily activity, conservative care has been attempted, and X-rays show a meaningful deformity. Purely cosmetic bunionectomy is not covered. We document conservative treatment failure and functional limitation prior to surgery to build the strongest possible insurance case. Call our office at (810) 206-1402 and we’ll verify your coverage before your consultation.

Can children get bunions?

Yes — juvenile bunions account for about 10% of all bunions and are typically bilateral and genetic. They’re most common in girls aged 10–15. Treatment in growing children is conservative whenever possible — wide-toe-box shoes and monitoring. Surgical correction is generally delayed until skeletal maturity (16–18) because operating on open growth plates increases recurrence risk. If your child has a painful or rapidly progressing bunion, evaluation is warranted to track progression.

When is bunion surgery actually necessary?

Surgery is appropriate when: pain is consistent and limits daily activities despite 3–6 months of conservative care, footwear options are severely restricted, there’s a secondary deformity (hammer toe, crossover toe) being driven by the bunion, or joint arthritis is developing. Mild, painless bunions don’t require surgery even if they look significant on X-ray. The decision is always functional, not cosmetic — we operate on pain, not appearance.