Toenail Falling Off: Treatment, Regrowth & When to See a Doctor (2026)

Waking up to find a toenail falling off is alarming if you’ve never experienced it before. But toenail avulsion — partial or complete nail loss — is actually a common podiatric occurrence with many causes and a predictable recovery process.

The good news: toenails almost always regrow. The key is knowing how to protect the nail bed during regrowth, recognize signs of infection, and understand when professional evaluation is needed.

Why Do Toenails Fall Off?

Toenail loss (onycholysis or nail avulsion) has several common causes, each with slightly different implications for treatment and prevention:

1. Trauma — Most Common Cause

Direct blunt trauma (dropping something on the toe), repetitive microtrauma (long-distance running, ill-fitting shoes), or subungual hematoma (blood pooling under the nail from a crush injury) are the most common causes. A large subungual hematoma creates pressure that separates the nail from the nail bed — the nail eventually falls off as the hematoma dries and the nail plate detaches.

2. Toenail Fungus (Onychomycosis)

Advanced toenail fungal infection causes nail plate thickening, crumbling, and progressive separation from the nail bed (onycholysis). Eventually, the nail may fall off entirely. This is the most common cause of spontaneous nail loss in the absence of acute trauma. The yellow-brown discoloration, crumbling texture, and thickening of the nail are distinguishing features.

3. Repetitive Running Microtrauma

Long-distance runners experience repetitive impact of the longest toe against the shoe toe box with each stride — often 10,000+ times per run. This chronic microtrauma creates a subungual hematoma similar to acute trauma but developing gradually. The ‘black toenail’ is the visible sign; toenail loss follows in weeks. The 2nd toe is most often affected in Morton’s toe anatomy.

4. Psoriasis

Psoriatic nail disease causes onycholysis, oil drop discoloration (salmon-pink patches visible through the nail), nail pitting, and eventual nail loss. May occur without skin psoriasis elsewhere. Can be confused with fungal nail disease — nail clippings for culture and PAS stain differentiate them.

5. Allergic Reaction or Chemical Exposure

Nail adhesives (for artificial nails), certain nail polishes, or chemical exposure can cause contact dermatitis of the nail bed, leading to onycholysis. The nail separates from the bed without infection or hematoma.

• Systemic illness (thyroid disease, iron deficiency, Raynaud’s)
• Chemotherapy agents (taxanes particularly cause nail changes)
• Medications (tetracyclines cause photo-onycholysis)
• Severe infection (paronychia spreading under the nail plate)

What to Do When a Toenail Falls Off

If the Nail Has Completely Detached

• Wash the nail bed gently with mild soap and warm water
• Pat dry with clean gauze or cloth
• Apply a thin layer of antibiotic ointment (Neosporin or bacitracin)
• Cover with a non-stick dressing (Telfa pad) held in place with paper tape or gauze
• Change the dressing daily or when soiled
• Wear protective footwear — a sandal or soft shoe that doesn’t press on the exposed nail bed

If the Nail Is Partially Detached

If the nail is still partially attached but clearly separating, do not force it off. Trim it flush with nail clippers as close as possible to where it is still attached — this removes the hanging portion that can snag and tear further. Leave the attached portion in place as it provides natural protection. Allow it to separate naturally as the new nail grows underneath.

How Long Does It Take for a Toenail to Grow Back?

Toenail regrowth is a slow, predictable process that most patients find surprisingly lengthy. The nail matrix (the growth center at the base of the nail) must regenerate the entire nail plate from scratch:

• Fingernails: grow approximately 3–4 mm per month; full regrowth 4–6 months
• Hallux (big) toenail: grows approximately 1–2 mm per month; full regrowth 12–18 months
• Lesser toenails (2nd–5th): somewhat faster; full regrowth 6–12 months
• Factors affecting speed: age (slower in older adults), circulation, nutrition (biotin, protein, zinc), season (slightly faster in summer)
• What to expect: new nail emerges from under the nail fold within 4–8 weeks; then grows slowly toward the tip

Caring for the Nail Bed During Regrowth

• Keep the area clean — wash gently daily with mild soap
• Apply antibiotic ointment for the first 2 weeks; switch to plain moisturizer as skin toughens
• Protect with a non-stick dressing during activities; can be left uncovered at rest
• Wear shoes with adequate toe box depth to prevent pressure on the regrowth area
• Avoid activities that put direct pressure on the affected toe during early regrowth
• As the new nail emerges, keep it trimmed straight across to prevent ingrown nail

Treating the Underlying Cause

For Fungal Nail Disease

If the nail fell off due to fungal infection, treatment of the remaining nails is essential. Topical antifungals (ciclopirox, efinaconazole) can be used on exposed nail beds. For widespread infection, oral terbinafine (12 weeks for toenails) is more effective. Laser antifungal treatment is available in our office. Without treating the fungus, the new nail will develop the same infection.

For Runner’s Toenail

Address shoe fit: runners need a full thumb’s width between the longest toe and the shoe end. For Morton’s toe anatomy (2nd toe longer than 1st), the second toe is the one requiring clearance. Consider custom orthotics with a forefoot accommodation to reduce the repetitive impact loading.

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.

For Trauma Prevention

Wear protective footwear in environments where dropping heavy objects is possible. Steel-toed boots for industrial work are the standard. For home projects, closed-toed shoes with reinforced toe caps provide meaningful protection.

Frequently Asked Questions: Toenail Falling Off

Do I need to see a doctor if my toenail fell off?

Not always. Healthy adults with a toenail that fell off due to obvious trauma, with no signs of infection and an intact nail bed, can manage at home with the care described above. Seek professional evaluation if: you have diabetes, you see signs of infection, the nail bed is damaged or appears abnormal, the nail fell off without clear cause, or you have concerns about nail regrowth.

Will my new toenail grow back normal?

In most cases, yes — if the nail matrix (growth center) is not damaged, the new nail grows back normally. Permanent nail deformity results from matrix damage, which can occur with severe crush injuries, deep infections, or certain fungal infections that destroy the matrix tissue. Your podiatrist can assess whether the matrix appears intact.

Should I remove the remaining part of the nail if it’s hanging?

Trim it cleanly with nail clippers as close as possible to the still-attached portion. Do not pull it off or tear it. If you cannot trim it comfortably without significant pain, have a podiatrist do it cleanly in office. A clean trim removes the hazard of snagging while leaving the attached portion as natural protection.

Can I paint my toenails while they’re regrowing?

Avoid nail polish on a regressing or newly regrowing nail during the early phases. Polish and remover chemicals can irritate the nail bed and the delicate new nail plate. Once the nail is at least halfway regrown and the nail bed is fully covered, polish can typically be used normally.

How do I prevent runner’s black toenail?

Correct shoe fit is the primary prevention: adequate length (thumb’s width clearance past longest toe), appropriate width, and lacing technique that prevents the foot from sliding forward. Trim toenails short before long runs. Moisture-wicking socks reduce friction. Some runners use toe spacers or toe caps (silicone covers) for long training runs.

Sources

• Bristow I. Noninfective Skin and Nail Disorders of the Foot. Clin Podiatr Med Surg. 2016;33(2):273–287.
• Scher RK, Tavakkol A, Sigurgeirsson B, et al. Onychomycosis: Diagnosis and Definition of Cure. J Am Acad Dermatol. 2007;56(6):939–944.
• Lipner SR, Scher RK. Onychomycosis: Treatment and Prevention of Recurrence. J Am Acad Dermatol. 2019;80(4):853–867.
• de Berker D. Clinical Practice. Nail Disease. N Engl J Med. 2009;360(24):2558–2568.
• Jeong WH, et al. Onycholysis: An Update in Classification, Causes and Treatment. J Dermatol. 2024;51(3):425–434.