
Nails are made of keratin, a protein that forms the cells that make up the tissue in nails. Fingernails and toenails grow slowly, with toenails taking longer to regrow. Nails grow from underneath the skin at the matrix, which is the root of the nail. New cells form in the matrix, and as these new cells grow, older cells move up and push through the skin. The cells on the surface die and harden, turning into nails. While nails typically grow back after being removed or falling off due to injury, certain injuries and illnesses can damage the nail matrix and affect how your nails look or grow.
| Characteristics | Values |
|---|---|
| Nail regeneration | Nails have good regeneration capacity |
| Nail growth rate | Fingernails may grow one-tenth of a millimeter each day, while toenails grow at about half or one-third of that rate |
| Time for nails to grow back | It can take up to 6 months for fingernails and 18 months for toenails to grow back |
| Factors affecting nail growth | Aging, diseases, skin conditions, injuries, overall health, diet, and hormones |
| Nail matrix damage | Minor damage to the nail matrix produces minor defects in the nail, while more significant damage can result in permanent deformation |
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What You'll Learn
- Nails typically grow back, but it may take up to 6 months for fingernails and 18 months for toenails
- Nail matrix damage can cause permanent nail deformities, but this is rare
- Illnesses like pneumonia or COVID-19 can cause Beau's lines (horizontal ridges)
- Peripheral artery disease and skin conditions like eczema can slow nail growth
- Ingrown toenails can be caused by fungal infections and treated with antifungal creams

Nails typically grow back, but it may take up to 6 months for fingernails and 18 months for toenails
Nails typically grow back, but the rate of regrowth depends on various factors. Firstly, toenails tend to grow back more slowly than fingernails. This is because the fingers receive more blood flow, likely due to being used more often.
Age is another factor that affects nail growth. Nails grow more slowly in older adults, as blood circulation slows with age. Nails also grow more slowly in colder climates. Furthermore, nails on the dominant hand tend to grow faster, as do nails on longer fingers. This is because the dominant hand is used more frequently, increasing the risk of trauma, which can cause nail damage.
Certain illnesses and injuries can also affect nail growth. For example, peripheral artery disease causes reduced blood flow to the legs and feet, which can slow nail growth. Serious illnesses, such as a heart attack, COVID-19, or pneumonia, can interrupt nail growth and cause horizontal ridges known as Beau's lines. Chemotherapy and other medications can also temporarily slow nail growth and cause Beau's lines or white bands called Mees' lines.
In the case of severe nail matrix damage, some or all of the nail may not grow back. The nail matrix is the "factory" where the body makes new nails. However, it is rare for the nail matrix to be permanently damaged. Minor damage will produce minor defects in the nail, while more significant damage can result in permanent deformation.
Overall, it may take up to 6 months for fingernails to grow back and up to 18 months for toenails to regrow.
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Nail matrix damage can cause permanent nail deformities, but this is rare
Nails have a good regeneration capacity, and they usually grow back after being removed or falling off. Fingernails typically take about 4 to 6 months to grow back, while toenails can take up to 18 months. However, it's important to note that these timelines can vary depending on various factors.
The nail matrix is the "factory" where your body produces new nails. It is located under the base of your nail, and the lunula, the white crescent shape at the base of your nail, is the only visible part of the nail matrix. When the nail matrix is damaged, it can affect nail growth and cause defects in the nail plate. Minor damage to the nail matrix will result in minor defects, while more severe damage can lead to permanent nail deformities.
Several factors can cause nail matrix damage, including injuries, illnesses, and certain medications. For example, pinching or crushing your finger or dropping something heavy on your toe can injure the nail matrix. Illnesses such as heart attacks, COVID-19, pneumonia, and peripheral artery disease can also interrupt nail growth and cause horizontal ridges known as Beau's lines. Chemotherapy and other medications may also temporarily affect the nail matrix, leading to Beau's lines or slow nail growth.
While nail matrix damage can result in permanent nail deformities, it is rare for the nail matrix to be permanently damaged to the extent that nail growth is prevented entirely. With proper medical care, nails often grow back, albeit with possible defects due to the damage. In cases of severe nail matrix damage, some or all of the nail may not grow back, but this is not a common occurrence.
To promote nail health and support regeneration, it is recommended to maintain a well-rounded diet and good overall health. Additionally, keeping your nails clean and trimmed is essential for overall nail health and can help prevent damage.
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Illnesses like pneumonia or COVID-19 can cause Beau's lines (horizontal ridges)
Nails have a good regeneration capacity, but they grow slowly. Fingernails may grow one-tenth of a millimeter each day, so completely removed fingernails usually grow within 6 months. Toenails, on the other hand, may grow at about half or one-third the rate of fingernails, meaning that completely removed toenails may take up to 18 months to grow back.
However, certain injuries and illnesses can damage the nail matrix and affect how your nails look or grow. A serious health event, such as a heart attack, or an illness like pneumonia or COVID-19, can interrupt new nail growth and cause Beau's lines, which are horizontal ridges or transverse grooves in the nails. Beau's lines can also be caused by chemotherapy and other medications, as well as skin conditions such as severe eczema and psoriasis. In the context of COVID-19, studies have documented the appearance of Beau's lines following infection or vaccination, with high variability in onset and resolution times. On average, Beau's lines appeared 3 months after COVID-19 infection and resolved after 6 months, while for vaccination, onset was at 7 days to 6 weeks and resolution occurred after 8 to 17 weeks.
If your nail matrix is not damaged, your nail will typically be capable of regrowth. In cases of severe nail matrix damage, some or all of your nail may not grow back, although it is rare for the nail matrix to be permanently damaged.
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Peripheral artery disease and skin conditions like eczema can slow nail growth
Fingernails and toenails have good regeneration capacity, but they grow slowly. Fingernails may grow at a rate of about one-tenth of a millimeter each day, while toenails grow at about half or one-third of that rate. Aging and certain illnesses can slow down the rate of nail growth by decreasing blood flow to the hands and feet.
One such illness is peripheral artery disease (PAD). PAD causes reduced blood flow to the legs and feet, which affects the nail matrix and slows down nail growth. Onychodystrophy, a deformity of the nail plate, may be an early marker of PAD.
Skin conditions like eczema can also impact nail growth. Severe eczema can affect the nail matrix and temporarily interfere with nail growth. Eczema on the nails can cause discoloration, grooving, and pitting. When eczema affects the hands and feet, it is called pompholyx eczema, which can affect the skin around the nails and cause swelling.
It is important to note that with proper treatment, healthy nails can often grow back. This may involve a combination of lifestyle changes, avoiding triggering products, and medical interventions. In the case of severe nail matrix damage, some or all of the nail may not grow back, but such cases are rare.
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Ingrown toenails can be caused by fungal infections and treated with antifungal creams
Ingrown toenails are a common problem, often caused by fungal infections. Fungi enter through small cuts or breaks in the nail, and fungal infections are more common in toenails than in fingernails. Toenails are also more susceptible to fungal growth due to the warm, damp environment of shoes and boots.
Fungal nail infections can cause the nail to thicken, change colour, and become brittle. In some cases, part of the nail may even detach from the nail bed. Ingrown toenails occur when the corner or side of the nail grows into the surrounding flesh, causing pain, redness, swelling, and sometimes yellow discharge.
Fungal nail infections can be treated with antifungal creams, ointments, gels, lacquers, or oral medications. Home remedies for treating yellow toenails caused by fungal infections include the use of antifungal nail creams, baking soda, vitamin E, and certain oils. Antifungal creams are available without a prescription and are applied after cutting and filing down the affected nail. One type of antifungal cream contains bifonazole, which is applied after soaking and drying the affected area. The softened nail is then scraped off, and the process is repeated over 14 days.
While antifungal creams can help treat fungal infections, they may not be as effective as oral medications or tablets in treating fungal nail infections. Oral medications include terbinafine, which can cure about one-third of nail fungus infections. It is important to note that tablets come with certain risks and are prescription-only.
With proper treatment, nails can grow back healthy, although it may take several weeks to a year for the nail to fully regenerate, depending on the nail and the individual. In rare cases, severe damage to the nail matrix may prevent the nail from growing back completely.
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Frequently asked questions
Yes, it is possible for nails to grow back after falling off. The nail matrix, which is the "factory" where your body makes nails, can be damaged by injuries or illnesses, affecting how your nails look or grow. However, with proper medical care, your nails will usually grow back, although it may take several weeks or months.
Nails typically grow back slowly, with toenails regrowing in up to 18 months and fingernails in about 6 months. Several factors influence the rate of nail regrowth, including age, overall health, nutrition, climate, and the reason for nail loss, such as trauma, infection, or other health conditions. Nails tend to grow faster in the summer and on the dominant hand.
To promote nail regrowth, it is important to maintain a well-rounded diet and good general health. Additionally, you can take vitamins such as biotin, folic acid, vitamin D, and vitamin B12, which are believed to be beneficial for nail health. Keeping your nails short and wearing well-fitting shoes can also help prevent nail damage and promote healthy regrowth.










































