Why Is My Toenail Falling Off? 6 Causes & What to Do

Your toenail is most likely falling off because of trauma to the nail bed—either a single injury like stubbing your toe or dropping something heavy on it, or repeated microtrauma from tight shoes or running.

Fungal infections, psoriasis, and certain medical conditions can also cause toenails to loosen and detach. While alarming to see, a toenail coming off is usually not a medical emergency, and in most cases, a healthy new nail will grow back within 6 to 18 months.

What Causes a Toenail to Fall Off?

When a toenail separates from the nail bed—a condition doctors call onycholysis—it's almost always triggered by physical damage, infection, or an underlying skin or health condition.

Understanding why your toenail is coming off helps you know whether you can manage it at home or need to see a healthcare provider. The nail bed is the skin beneath your nail, and when it's damaged or irritated, the nail loses its grip and starts to lift from the tip or sides.

Here are the most common reasons your big toenail or any toenail might be falling off in 2026.

Did You Injure Your Toe Recently?

Acute trauma is the number-one reason toenails fall off. Dropping a heavy object on your foot, stubbing your toe hard against furniture, or having someone step on your foot can cause blood to pool under the nail (a subungual hematoma). That pressure eventually loosens the nail from the bed.

You'll often notice the nail turning dark purple or black before it starts to separate. The discoloration is dried blood trapped beneath the nail plate. Over days or weeks, the damaged nail lifts and eventually comes off—sometimes in one piece, sometimes gradually.

"Subungual hematoma is a common nail bed injury caused by blunt or sharp trauma to the fingers or toes." — Matthew D. Ostrander, DO at StatPearls/NCBI

Are Your Shoes Too Tight or Too Short?

Repetitive microtrauma from ill-fitting footwear causes toenails to fall off without a single memorable injury. This is especially common in runners, hikers, and people who stand for long hours in shoes that crowd the toes.

When your toenail repeatedly bumps against the front or top of your shoe, the nail bed sustains tiny injuries over time. Athletes often call this "runner's toe" or "black toenail." The big toenail is most vulnerable because it's the longest and takes the most impact.

Signs of shoe-related nail loss include:
- Thickening or discoloration before the nail loosens
- Pain that worsens during activity
- Both big toenails affected (bilateral involvement suggests footwear, not random injury)

Could It Be a Fungal Infection?

Fungal nail infection (onychomycosis) is the most common medical cause of toenails falling off. The fungus grows under the nail, feeding on keratin—the protein that makes up the nail plate. As infection progresses, the nail becomes thick, brittle, yellow or brown, and eventually separates from the bed.

Fungal infections develop slowly. You might notice discoloration and texture changes for months before the nail starts coming off. The infection thrives in warm, moist environments—sweaty shoes, gym locker rooms, public pools.

"Onychomycosis is a fungal infection of the nail unit that may be caused by dermatophytes, yeasts, and non-dermatophyte molds." — Antonella Tosti, MD at American Academy of Dermatology

If your toenail is crumbly, discolored, and has been that way for a while before falling off, fungus is a likely culprit.

Is Psoriasis or Another Skin Condition Involved?

Psoriasis can affect nails even when skin plaques are minimal. Nail psoriasis causes pitting (small dents in the nail surface), discoloration, thickening, and separation from the nail bed. Around 50% of people with psoriasis experience nail changes at some point.

Other skin conditions that can make toenails fall off include:
- Lichen planus — causes ridges and thinning that weaken the nail
- Alopecia areata — surprisingly, this hair-loss condition can also affect nails
- Contact dermatitis — allergic reactions to nail polish, adhesives, or chemicals

If you have a diagnosed skin condition and your toenails are coming off, the two are likely connected.

Could Medications Be the Cause?

Certain medications cause photosensitivity reactions that damage nails when you're exposed to sunlight. This drug-induced photo-onycholysis is most associated with:

If you started a new medication before your toenail began separating—especially if you've had sun exposure—mention this to your doctor.

Are There Underlying Health Conditions?

Several systemic health issues can cause toenails to fall off:

• Thyroid disorders — both hyperthyroidism and hypothyroidism affect nail growth and attachment
• Peripheral vascular disease — poor blood flow to the extremities weakens nails
• Diabetes — increases susceptibility to fungal infections and slows healing
• Anemia — severe iron deficiency can cause brittle, spoon-shaped nails prone to detachment

If you have no obvious injury or infection and toenails are coming off, it's worth discussing with your doctor to rule out underlying conditions.

Also Read: Why Is My Feet Peeling? 9 Causes & How to Fix It

What to Do When Your Toenail Is Falling Off

Keep the area clean, protect it from further injury, and let nature take its course—in most cases, a new nail will grow in behind the old one.

Here's how to care for a toenail that's coming off:

1. Don't force it off. A partially attached nail protects the sensitive nail bed underneath. Let it separate naturally or have a doctor trim it if it's catching on things.

2. Clean the area gently. Wash with mild soap and water daily. If the nail is loose, you can gently lift it to clean underneath, but don't dig or poke.

3. Apply antibiotic ointment. A thin layer of over-the-counter antibiotic ointment (like Neosporin) helps prevent bacterial infection of the exposed nail bed.

4. Cover with a bandage. Keep the nail protected with a breathable bandage, especially when wearing shoes. Change the bandage daily or whenever it gets wet.

5. Wear protective footwear. Avoid tight shoes that press on the affected toe. Open-toed sandals can work well at home, but wear closed shoes with extra toe room when you're active.

6. Watch for infection signs. Redness spreading beyond the nail, increasing pain, swelling, warmth, or pus means you need medical attention promptly.

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

A toenail takes 12 to 18 months to fully regrow—significantly longer than fingernails, which regenerate in about 6 months.

The big toenail grows the slowest because it's the largest. Age, circulation, and overall health also affect regrowth speed. You'll notice the new nail emerging from the cuticle within a few weeks of the old nail falling off, but it takes over a year for that new nail to reach the tip of your toe.

During regrowth:
- The nail bed may look pink and feel tender initially
- The new nail starts thin and gradually thickens
- Slight irregularities in texture or color are normal at first

If the nail bed was severely damaged, the new nail may grow back thicker, ridged, or slightly misshapen. This usually improves over time but can be permanent in some cases.

When to See a Doctor About a Toenail Falling Off

Most toenail losses heal fine at home, but certain situations require professional evaluation.

See a healthcare provider if:

• You have diabetes or poor circulation — these conditions increase infection risk and slow healing
• Signs of infection appear — spreading redness, pus, fever, or worsening pain
• The nail falls off without obvious cause — unexplained nail loss can signal underlying health issues
• Multiple toenails are affected — suggests systemic cause rather than local injury
• You suspect fungal infection — prescription antifungals are often needed for toenail fungus
• A subungual hematoma is extremely painful — a doctor can drain the blood to relieve pressure

For recurring toenail problems, a podiatrist (foot specialist) can evaluate your foot structure, gait, and footwear to prevent future issues.

Also Read: Why Is My Tattoo Raised? 8 Causes & How to Fix It

How to Prevent Toenails From Falling Off

Proper footwear, good hygiene, and prompt treatment of early problems stop most toenail loss before it happens.

Prevention strategies that work:

• Get properly fitted shoes. There should be a thumb's width between your longest toe and the shoe's end. Your toes shouldn't touch the top when walking.

• Trim nails correctly. Cut straight across, not curved at the corners. Don't trim too short. File sharp edges.

• Keep feet dry. Moisture-wicking socks and foot powder reduce fungal infection risk. Change socks after heavy sweating.

• Protect feet in public areas. Wear shower shoes in gym locker rooms, pools, and hotel bathrooms.

• Treat discoloration early. Yellow or thickening nails often indicate fungal infection—treating early prevents progression to nail loss.

• Address trauma quickly. Ice a badly stubbed toe, and if blood pools under the nail, see a doctor within 48 hours for possible drainage.

In Short

Your toenail is falling off most likely due to trauma—either a single injury or repeated pressure from tight shoes and physical activity. Fungal infections, skin conditions like psoriasis, certain medications, and underlying health problems can also cause toenails to loosen and detach. Keep the area clean and protected while the new nail grows in over the next 12 to 18 months. See a doctor if you have diabetes, signs of infection, or toenails falling off without explanation.

What You Also May Want To Know

Why Is My Big Toenail Coming Off Without Any Injury?

When your big toenail separates without obvious trauma, the most common causes are fungal infection, repetitive microtrauma from shoes you didn't realize were too tight, or an underlying skin condition like psoriasis. Certain medications and systemic health issues like thyroid disorders can also cause unexplained nail separation. If you can't identify a cause, schedule an appointment with your doctor to rule out treatable conditions.

Will My Toenail Grow Back Normally After Falling Off?

In most cases, yes—a new toenail will grow from the matrix (the root under your cuticle) and look normal once fully grown. The process takes 12 to 18 months for toenails. If the nail bed or matrix was severely damaged, the new nail might grow back thicker, ridged, or slightly different in shape, but it will still function as a protective nail.

Should I Pull Off a Toenail That's Hanging On?

No, don't pull it off yourself. A partially attached nail protects the sensitive nail bed beneath it. Let the nail separate naturally, or have a doctor trim the loose portion if it's catching on socks or causing discomfort. Pulling risks damaging the nail bed, causing bleeding, and increasing infection risk.

Can Toenail Fungus Make Your Entire Nail Fall Off?

Yes, advanced fungal infections can cause complete nail detachment. As the fungus grows between the nail plate and the nail bed, it breaks down the connection and the nail lifts away. The process is gradual—you'll typically notice yellowing, thickening, and crumbling before the nail comes off entirely. Prescription antifungal medications can treat the infection and help the new nail grow in healthy.

How Do I Know If My Falling Toenail Is Infected?

Signs of infection include increasing pain (rather than improving), redness spreading beyond the nail area onto surrounding skin, swelling of the entire toe, warmth to the touch, pus or foul-smelling discharge, and fever. Normal healing involves mild discomfort that improves daily and redness limited to the immediate nail area. If you see infection signs, see a doctor promptly—you may need antibiotics.

Reviewed and Updated on May 9, 2026 by George Wright