Caleb Foster
Nail growth is influenced by a variety of factors, including age, sex, season, exercise, diet, hereditary factors, and overall health. On average, fingernails grow at a rate of about 0.1 millimeters per day or around 3 millimeters per month, while toenails grow at a slower rate of about 1.62 millimeters per month. The nails on the dominant hand tend to grow faster, possibly due to more frequent use and an increased risk of trauma, which triggers the body to send more blood and nutrients to the area, promoting repair and growth. While there is no proven method to accelerate nail growth, maintaining good nail hygiene and overall health can help support the process.
| Characteristics | Values |
|---|---|
| Average growth of fingernails | 3 mm per month or 0.1 mm per day |
| Average growth of toenails | 1 mm per month or 1.62 mm per month |
| Factors affecting nail growth | Age, sex, season, exercise, diet, hereditary factors, overall health, hormones, habits, and medical conditions |
| Nails on the dominant hand | Tend to grow faster |
| Nails on larger fingers | Tend to grow faster |
| Nails during the summertime | Tend to grow faster |
| Nails during the daytime | Tend to grow faster |
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What You'll Learn
Toenails vs. fingernails
Fingernails and toenails are both made of a tough protective protein called keratin. They consist primarily of the nail plate, the nail matrix, and the nail bed below it, and the grooves surrounding it. The nail matrix is the part where nails begin to grow, creating new skin cells that push out old dead skin cells to form both finger and toenails. The nail bed is the vascular epidermis on which most of the nail rests, with a longitudinally ridged surface that is often visible through the nail. The nail plate is the "dead" or painless part of the nail.
Fingernails grow at an average rate of approximately 3.5 mm per month, or about 0.1 millimeters daily. They require three to six months to regrow completely. Toenails, on the other hand, grow about half as fast as fingernails, at an average rate of 1.62 mm per month. It takes toenails about twelve to eighteen months to regrow completely. The growth rate of both fingernails and toenails is influenced by various factors, including age, sex, season, exercise level, diet, and hereditary factors. For example, nails grow faster in the summertime and during pregnancy, while health conditions impacting nail growth, such as fungal infections, become more common with age.
In addition to growth rate, there are other differences between toenails and fingernails in terms of their appearance and potential issues. The lunula, a curved white mark at the bottom of the fingernail, is most noticeable on the thumb, although not everyone's lunula is visible. Fingernails also have a function in protecting the distal phalanx, the fingertip, and the surrounding soft tissues from injuries, as well as enhancing delicate movements of the distal digits. Toenails, on the other hand, are more prone to issues such as ingrown toenails (onychocryptosis) and toe infections caused by dirty socks, aggressive exercise, tight footwear, or walking unprotected in an unclean environment.
While toenails and fingernails have their distinct characteristics and growth rates, caring for them involves similar practices. Good nail hygiene, regular trimming, and filing can help promote nail health and prevent issues such as roughness and infections. Additionally, biotin-rich foods and supplements can strengthen brittle fingernails, and maintaining a balanced diet with adequate vitamins and minerals can prevent dryness and brittleness.
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Seasonal variation
The time of day also influences nail growth, with fingernails growing faster during the day. The nails on the dominant hand and longer fingers grow at a faster rate as well. This is because the dominant hand is used more often and is, therefore, more prone to injury or trauma, which could lead to quicker nail growth as the body sends more blood and nutrients to the area to aid in healing.
Age is another significant factor that affects nail growth. Nail growth typically peaks during puberty and begins to slow down as hormone levels stabilise with age. As people age, blood circulation slows down, and various health conditions impacting nail growth become more prevalent. For example, fungal infections of the nail, known as onychomycosis, are more common in older individuals.
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Nutritional deficiencies
Vitamin deficiencies can cause nails to become brittle, weak, and rough, and lose their smoothness. Iron, zinc, calcium, and vitamins A, B, C, and E are some of the major nutrient deficiencies that may affect nail health. For example, vitamin C deficiency can cause splinter hemorrhages, thin red, brown, or blackish lines under the nails. A vitamin B12 deficiency may also cause nail changes, including discoloration.
Iron deficiency is another common cause of nail issues. This can lead to koilonychia, where nails become extremely thin and take on a spoon-like shape. Iron deficiency can also cause nails to become brittle and peel.
Protein deficiency can also lead to nail problems. Beau's lines, for example, are transverse linear depressions in the nail plate that may be caused by protein deficiency or a general malnourished state.
In some cases, nail changes may be a sign of more serious nutritional syndromes. Kwashiorkor, a nutritional syndrome resulting from severe protein malnutrition, is associated with nails that are soft and thin. Marasmus, caused by prolonged starvation, can result in a 40-50% reduction in body weight and is linked to fissured nails and impaired nail growth.
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Age and sex
Age is a significant factor in how fast your nails grow. Children's nails grow quickly, and nail growth slows down as we age. A 1980 study examined the nail growth rate of a man over a 35-year period. At 23, his thumbnail grew at a rate of 0.123 mm per day, and by age 67, this had dropped to 0.095 mm per day. This change in speed may be due to a reduction in proliferation and metabolism at the organism level with age, as well as a decrease in blood flow as we get older.
Nail growth is said to peak during puberty and decline as hormone levels balance out with age, to about 50% of its previous rate.
Pregnancy is another time when hormones boost metabolism and increase circulation, causing nails to grow more quickly. People receiving androgen replacement therapy (testosterone) may also experience increased nail growth.
The speed of nail growth may also be affected by certain health conditions. For example, conditions like thyroid disease, hypopituitarism, diabetes, and osteoporosis can cause fragile, slow-growing nails.
In terms of sex, men's nails tend to grow faster than women's. A study involving young Japanese individuals found that the average growth rate of the thumbnail was 3.06 mm per month for men and 2.94 mm per month for women.
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Medical conditions
Several medical conditions can affect nail growth and appearance. Firstly, nail growth is influenced by a person's overall health, age, hormones, and habits. For instance, people receiving androgen replacement therapy (testosterone) may experience increased nail growth. Moreover, older people are more susceptible to health conditions that impact nail growth, such as fungal infections, which account for about half of all nail disorders in older individuals.
Nail abnormalities are common and can affect the shape, thickness, or colour of nails. Certain abnormalities may require medical attention, and healthy nails typically appear smooth with consistent colouring. As people age, their nails may develop vertical ridges or become more brittle, which is usually harmless. However, spots due to injury should grow out with the nail. Abnormalities such as spots, discolouration, and nail separation can result from injuries, viral warts, infections, and certain medications like chemotherapy.
Discolouration, particularly dark streaks, can indicate melanoma, the most severe form of skin cancer. Other changes in nail colour, such as yellow nail syndrome, may signal underlying issues like lung disease or rheumatoid arthritis. Nails with dents or pits could indicate alopecia areata or other systemic diseases. Deep grooves or gaps that run across the width of the nail, known as Beau's lines, can signify malnourishment or diseases that cause high fevers, such as measles, mumps, or scarlet fever.
Additionally, specific medical conditions can cause unique nail abnormalities. For example, people with diabetes may develop ingrown toenails, and those with psoriasis may experience nail pitting. Onychogryphosis, or Ram's horn nails, is a condition where the nail thickens and overgrows, sometimes resembling a ram's horn. Spoon-shaped nails may indicate iron deficiency, while washboard nails with grooves and ridges can result from the habit of picking or pushing back cuticles.
In summary, while nail growth and appearance can be influenced by various factors, certain medical conditions can cause noticeable changes. It is essential to consult a doctor or dermatologist if you observe any unusual or persistent changes in your nails to ensure proper diagnosis and treatment.
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Frequently asked questions
On average, fingernails grow about 3.47 mm per month, or about 0.1 mm per day. Toenails grow at a slower rate of about 1.62 mm per month.
Nails on your dominant hand grow faster because you use that hand more often. This makes them more prone to trauma, which increases blood flow and nutrient delivery to the area, promoting nail growth.
No, nails do not continue to grow after death. The skin dehydrates and tightens, which may give the appearance of nail and hair growth.
Nail growth is influenced by age, sex, season, exercise, diet, hereditary factors, and overall health.
While there is no proven method to increase nail growth, maintaining good nail hygiene and keeping your nails strong and healthy can help promote growth.
