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Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
Quick Answer: Thick toenails (onychauxis) are most commonly caused by onychomycosis (fungal nail infection), trauma, psoriatic nail disease, or aging-related nail plate changes. Treatment depends on the cause: antifungal medications for fungal infection, professional debridement for all causes, and laser treatment for fungal infections resistant to oral therapy.
Why Do Toenails Get Thick?
Toenail thickening (onychauxis) occurs when the nail plate grows faster than it can shed, creating layers of keratinized nail material that accumulate over time. The nail plate is produced by the nail matrix — the living cells at the base of the nail — and any disruption to normal matrix function causes abnormal nail growth. Understanding the specific cause guides the correct treatment.
Onychomycosis (fungal nail infection): The leading cause of thick toenails, affecting 10% of the general population and up to 50% of adults over 70. Dermatophyte fungi (Trichophyton rubrum most commonly) invade the nail plate and nail bed, producing enzymes that destroy the nail keratin architecture and trigger hyperkeratotic thickening, discoloration, and fragility. Trauma: Repetitive microtrauma from shoe pressure (runner’s toe) or single acute trauma causes subungual hematoma and nail matrix disruption. The nail grows back thickened and distorted after significant trauma. Psoriasis: Nail psoriasis affects 80–90% of patients with psoriatic arthritis. Characteristic signs include pitting, oil-drop (salmon patch) discoloration, onycholysis (nail separation), and subungual hyperkeratosis (thick nail debris under the plate). Aging: Normal aging slows nail plate growth and produces a gradual thickening — particularly in older patients with reduced peripheral circulation.
Treatment Options
Professional debridement: Regardless of cause, mechanical reduction of the nail plate by a podiatrist removes the accumulated thickened nail, improves topical penetration, and immediately reduces discomfort from shoe pressure. This should be performed every 8–12 weeks for chronic thick nails. Oral antifungal: Terbinafine (Lamisil) 250mg daily for 12 weeks achieves mycological cure in 60–80% of onychomycosis cases. Lab confirmation (nail clipping culture or PAS stain) before treatment is recommended, as clinical appearance alone is not sufficient for diagnosis — only 50% of thick nails are actually fungal. Topical antifungal: Ciclopirox (Penlac) and efinaconazole (Jublia) have lower cure rates than oral therapy but are appropriate for mild disease or patients who cannot take oral terbinafine. Laser treatment: Nd:YAG laser safely delivers fungicidal energy through the nail plate. Effective for cases resistant to oral antifungal therapy or patients with medication contraindications.
Dr. Tom's Product Recommendations
Doctor Hoy’s Natural Pain Relief Gel
⭐ Highly Rated | Foundation Wellness Partner | 30% Commission
For thick toenail patients with associated periungual (around the nail) inflammation and discomfort, Doctor Hoy’s arnica formula provides topical relief. Apply around (not under) the nail margins 1–2 times daily to reduce inflammation from shoe pressure on thickened nails.
Dr. Tom says: “For my thick nail patients waiting for antifungal treatment to work — which takes 9–12 months — Doctor Hoy’s around the nail margins reduces the periungual inflammation that causes daily shoe discomfort. It’s a practical comfort measure during the long treatment course.”
Periungual inflammation, shoe pressure discomfort with thick nails, temporary comfort
Do not apply under an onycholytic (separated) nail plate; active infection requires antifungal
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Oral terbinafine achieves 60–80% mycological cure rate
- Professional nail debridement provides immediate comfort relief
- Laser treatment effective for medication-resistant fungal infections
- Diagnosis with nail culture confirms fungal cause before initiating expensive oral treatment
❌ Cons / Risks
- Oral antifungal treatment takes 9–12 months to see full results
- Lab testing before treatment is under-utilized (50% of thick nails are not fungal)
- Recurrence after successful treatment is common without preventive measures
- Psoriatic nail disease cannot be treated with antifungals — requires dermatologic management
Dr. Tom Biernacki’s Recommendation
I culture every thick nail before prescribing oral terbinafine. Half of thick nails in my practice are not fungal — they’re traumatic, psoriatic, or aging-related. Treating a non-fungal thick nail with terbinafine is both ineffective and potentially hepatotoxic. The PAS stain nail clipping is a $30 test that prevents a lot of unnecessary treatment. Get the diagnosis right first.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
Are thick toenails always fungal?
No. Only about 50% of thick toenails have confirmed fungal infection. Trauma, psoriasis, aging, and poor circulation also cause nail thickening. A nail clipping for culture or PAS stain confirms the diagnosis.
How do I know if my thick toenails are fungal?
Clinical clues for fungal infection: yellowish-brownish discoloration, crumbling nail edges, white streaks (white superficial onychomycosis), and subungual debris. Confirmation requires laboratory testing (PAS stain or culture).
Can I file down thick toenails myself?
A nail file or emery board can thin mildly thickened nails for temporary comfort. Professional debridement by a podiatrist uses electric drills and proper instruments to safely reduce thick nails without damaging the nail bed.
How long does terbinafine take to clear nail fungus?
Terbinafine is taken for 12 weeks (fingernails) or 12–16 weeks (toenails). However, visible nail clearing takes 9–12 months as the new nail grows out from the matrix.
Does nail fungus spread to other toes?
Yes. Onychomycosis can spread from nail to nail and to the skin (athlete’s foot). Treating athlete’s foot simultaneously with nail fungus is essential to prevent re-infection.
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📞 (810) 206-1402 Book Online →When Shoes Aren’t Enough — Dr. Tom’s Top 9 Orthotics
About 30% of patients I see for foot pain need MORE than a great shoe — they need a structured insole. Below: my complete 2026 orthotic ranking with pros, cons, and the specific patient I’d give each one to.
★ DR. TOM’S COMPLETE 2026 ORTHOTIC RANKING
9 Best Prefab Orthotics by Use Case
PowerStep, CURREX, Spenco, Vionic, and Tread Labs — every orthotic I’ve fitted to thousands of patients across both Michigan offices. Each card includes pros, cons, and the specific patient I’d give it to. Real Amazon ratings, review counts, and prices below.
Best All-Purpose Orthotic for Most Patients
Semi-rigid arch shell + dual-layer cushion + deep heel cup. The orthotic I’ve fitted to more patients than any other for 15 years. APMA-accepted. Trim-to-fit design works in athletic shoes, casual shoes, and most work boots.
✓ Pros
- Semi-rigid arch shell provides true biomechanical correction
- Deep heel cup centers the heel and reduces lateral instability
- Dual-layer cushion (top + bottom) lasts 9-12 months daily wear
- Available in 8 sizes for precise fit
- APMA-accepted and clinically validated
- APMA-accepted with superior cushioning versus rigid alternatives
✗ Cons
- Too thick for most dress shoes (use ProTech Slim instead)
- Some break-in period required (3-7 days for arch tolerance)
- Not enough correction for severe pes planus or rigid pes cavus
Dr. Tom’s Recommendation: If a patient has run-of-the-mill plantar fasciitis, mild flat feet, or arch fatigue, this is the first orthotic I try. Better value than most premium alternatives for 90% of patients, which is why it’s the first orthotic I reach for in the clinic. Sub-$50 typically.
Maximum Motion Control · Flat Feet & Severe Over-Pronation
PowerStep’s most aggressive stability orthotic. Adds a 2°-7° medial heel post on top of the standard PowerStep platform — designed specifically for flat-footed patients and severe pronators who need real corrective force.
✓ Pros
- 2°-7° medial heel post adds aggressive pronation control
- Same trusted PowerStep arch shell, more correction
- Built specifically for flat-foot biomechanics
- Excellent for posterior tibial tendon dysfunction (PTTD)
- Removable top cover for cleaning
✗ Cons
- Too aggressive for neutral-arch patients
- Needs longer break-in (10-14 days) due to stronger correction
- Adds 2-3 mm of stack height — won’t fit slim dress shoes
Dr. Tom’s Recommendation: When a patient comes in with significant flat feet AND symptoms (heel pain, arch pain, knee pain), the Original PowerStep isn’t aggressive enough. The Maxx is what gets prescribed. About 25% of my flat-footed patients end up here.
Low-Profile · Fits Dress Shoes & Narrow Casuals
3 mm slim profile with podiatrist-designed tri-planar arch technology. Engineered specifically to fit inside dress shoes, oxfords, loafers, and women’s flats without crowding the toe box. Vionic was founded by an Australian podiatrist.
✓ Pros
- 3 mm slim profile (vs 7-10 mm for standard orthotics)
- Tri-planar arch technology adds support without bulk
- Built-in deep heel cup despite slim design
- Fits dress shoes WITHOUT having to remove the factory insole
- Trim-to-fit · APMA-accepted
✗ Cons
- Less arch support than full-volume orthotics
- Top cover wears faster than thicker alternatives
- Not enough correction for severe foot deformities
Dr. Tom’s Recommendation: My default when a patient says ‘I need orthotics but I have to wear dress shoes for work.’ Slim enough to fit in oxfords and pumps without the heel sliding out. The single highest-impact change you can make for office workers with foot pain.
Built-In Metatarsal Pad · Morton’s Neuroma · Ball-of-Foot Pain
Standard Pinnacle orthotic with a built-in metatarsal pad positioned proximal to the metatarsal heads — the exact location that offloads neuromas and metatarsalgia. No need for separate met pads or pad placement guesswork.
✓ Pros
- Built-in met pad eliminates DIY pad placement errors
- Specifically designed for Morton’s neuroma + metatarsalgia
- Same trusted PowerStep arch + heel cup platform
- Top cover protects sensitive forefoot skin
- Faster relief than orthotics + add-on met pads
✗ Cons
- Met pad position is fixed (can’t fine-tune individual placement)
- Some patients with very small or very large feet need custom
- Slightly thicker than the standard Pinnacle
Dr. Tom’s Recommendation: If a patient has Morton’s neuroma, sesamoiditis, or generalized ball-of-foot pain (metatarsalgia), this saves a clinic visit and a prescription. The built-in pad placement is anatomically correct for 80% of feet. Way better than DIY met pads.
Adaptive Dynamic Arch · Athletic & Daily Wear
Currex’s flagship adaptive arch technology — the orthotic flexes with your gait instead of fighting it. Different stiffness zones along the length give you targeted support at the heel, midfoot, and forefoot. Available in three arch heights (low/medium/high).
✓ Pros
- Dynamic flex zones adapt to natural gait cycle
- Three arch heights ensure precise fit
- Lighter than rigid orthotics (no ‘heavy foot’ feel)
- Excellent for runners and athletic walkers
- European podiatric design (German engineering)
✗ Cons
- More expensive than PowerStep Original ($55-65 typically)
- Less aggressive correction than Pinnacle Maxx for severe cases
- Three arch heights means you must self-select correctly
Dr. Tom’s Recommendation: I started recommending Currex three years ago for runners who said PowerStep felt ‘too rigid.’ The dynamic flex zones respect natural gait. Best for active patients who walk 8K+ steps daily and don’t need maximum motion control.
Running-Specific · Heel Strike + Forefoot Strike Compatible
Currex’s purpose-built running orthotic. The midfoot flex zone is positioned for runner’s gait mechanics, with a flared heel cushion for heel strikers and a forefoot rocker for midfoot/forefoot strikers. Tested on 1000+ runners during product development.
✓ Pros
- Designed by German biomechanics lab specifically for runners
- Dynamic arch flexes with running gait (not static like PowerStep)
- Three arch heights (low/medium/high)
- Reduces overuse injury risk in mid-distance runners
- Lightweight (no impact on cadence)
✗ Cons
- Premium price ($60-75)
- Not aggressive enough for severe over-pronators (use Pinnacle Maxx)
- Runner-specific design = less ideal for daily walking shoes
Dr. Tom’s Recommendation: If a patient runs 20+ miles per week and has plantar fasciitis or shin splints, this is the orthotic I prescribe. The dynamic flex zones respect running biomechanics in a way that no rigid PowerStep can match. Pricier but worth it for serious runners.
Cavus Foot & High-Arch Patients
Polyurethane base with a deeper heel cup and higher arch profile than PowerStep — built for cavus (high-arched) feet that need maximum cushion and support. The 5-zone cushioning system addresses the unique pressure points of high-arch feet.
✓ Pros
- Deeper heel cup centers the heel for cavus foot stability
- Higher arch profile fills the void under high arches
- 5-zone cushioning addresses cavus foot pressure points
- Polyurethane base lasts 12+ months
- Available in Wide width
✗ Cons
- Too tall/aggressive for normal or low arches
- Won’t fit slim dress shoes
- Pricier than PowerStep Original
- Some patients find the arch height uncomfortable initially
Dr. Tom’s Recommendation: Cavus foot patients are often misdiagnosed and given low-arch orthotics — that makes everything worse. Spenco’s Total Support has the arch profile that high-arch feet actually need. About 15% of my patients have cavus feet; this is what they wear.
Cushion Layer · Standing All Day · Gel Pressure Relief
NOT a true biomechanical orthotic — this is a cushion insole. But for patients who want gel pressure relief instead of arch correction (or to add ON TOP of factory insoles in work boots), this is the best gel option on Amazon.
✓ Pros
- Genuine gel cushioning (not foam pretending to be gel)
- Targeted gel waves under heel and ball of foot
- Trim-to-fit · works in most shoe types
- Sub-$15 price (most affordable option in this list)
- Massaging texture is genuinely soothing
✗ Cons
- ZERO arch support — this is cushion only
- Won’t fix plantar fasciitis or flat-foot issues
- Compresses faster than PowerStep (4-6 months)
- Top cover wears through in high-mileage applications
Dr. Tom’s Recommendation: I recommend these to patients who tell me ‘I just want my feet to stop hurting at the end of my shift’ and who don’t have a biomechanical issue. Construction workers, factory workers, retail. Pure cushion does the job for them.
Tight-Fitting Shoes · Cycling Shoes · Hockey Skates
Tread Labs Pace insole with firm orthotic arch support for flat feet and plantar fasciitis relief. The replaceable top cover design makes it one of the most durable picks in this guide — backed by a million-mile guarantee and recommended for tight-fitting athletic footwear.
✓ Pros
- Firm orthotic arch support shell (podiatrist-grade)
- Slim profile fits tight athletic footwear
- Lasts 12+ months daily wear
- Excellent for cycling shoes specifically
- Built-in odor-control treatment
✗ Cons
- Premium price ($45-55)
- Less cushion than PowerStep equivalents
- Not as aggressive correction as Pinnacle Maxx for flat feet
- The signature ‘heel cup feel’ takes 1-2 weeks to adapt to
Dr. Tom’s Recommendation: If you’re a cyclist with foot numbness, hot spots, or knee pain — this is the orthotic. The stabilizer cap solves cycling-specific biomechanical issues that no other orthotic addresses. Worth the premium for athletes.
None of these solving your foot pain?
Some patients (about 30%) need custom-molded prescription orthotics. We make 3D-scanned custom orthotics in our Howell and Bloomfield Hills offices — specifically built for your foot mechanics.
Schedule a Custom Orthotic Fitting →FSA/HSA eligible · Most insurance accepted · (810) 206-1402
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Plantar Fasciitis: Diagnosis and Conservative Management (PubMed)
- Plantar Fasciitis (APMA)
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
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