Isla Bennett
The growth rate of nails depends on several factors, including age, gender, season, exercise level, diet, and hereditary factors. Nails grow at an average rate of 3.5 millimetres per month or between 0.5 and 1.2 millimetres per week. Interestingly, the thumb nails grow the slowest, while the middle nail grows the fastest. This may be because blood circulation slows with age, and the thumb has a comparatively lower blood flow.
| Characteristics | Values |
|---|---|
| Thumbnail growth rate | 0.123 mm per day at age 23, 0.095 mm per day at age 67 |
| Factors affecting thumbnail growth rate | Age, gender, hormones, season, exercise level, diet, hereditary factors, blood flow |
| Toenail growth rate | Three times slower than fingernails, averaging 1.62 mm per month |
| Toenail regrowth time | 12-18 months |
| Fingernail regrowth time | 3-6 months |
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What You'll Learn
Thumb nails are the slowest-growing nails
The rate at which fingernails grow varies depending on several factors, including age, gender, and hormones. Typically, men's nails grow faster than women's, except during pregnancy, when women's nails tend to grow more quickly. Nails also tend to grow faster in the summer and after an illness. Interestingly, the length of your fingers also affects nail growth—the longer the fingers, the faster the nails grow.
Among all the fingernails, the thumb nails grow the slowest. A 2007 study found that the little finger's nail grows slower than other fingernails, but the thumb nails are even slower. This may be because the thumb is generally shorter than the other fingers. Additionally, the thumb nails may benefit from less blood flow due to their position further away from the heart. As blood circulation is essential for nail growth, reduced blood flow could result in slower growth for thumb nails.
The rate of nail growth is also influenced by the activity level of the hand. Nails on the dominant hand, typically the hand used for writing, eating, and other activities, tend to grow faster. This is because the nails are subjected to more "terminal trauma," where the constant use of the fingers wears down the nails, prompting the body to increase nail growth to compensate. The thumb, however, may be less involved in intricate tasks compared to other fingers, resulting in less trauma and slower nail growth.
Another factor contributing to slower thumb nail growth could be the angle at which the thumb nail grows. Unlike the other fingernails, the thumb nails grow at a steeper angle towards the finger, which may hinder their growth rate. Additionally, the thumb nails are more exposed to the elements and are more likely to be washed and scrubbed, which could affect their growth.
While thumb nails are indeed the slowest-growing nails, it's important to note that nail health and growth can be influenced by various factors, including diet, exercise, and hereditary traits. Maintaining good nail hygiene and a healthy lifestyle can help support optimal nail growth.
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Nail growth slows with age
The rate of nail growth is influenced by several factors, including age, gender, and hormones. Typically, nails grow at an average rate of 3.5 millimetres per month or between 0.5 and 1.2 millimetres per week.
Age is a key factor influencing nail growth rates. As we get older, our nails tend to grow more slowly. For example, a 2007 study observed that the left thumbnail of an individual grew at a rate of 0.123 mm per day at age 23, but this rate decreased to 0.095 mm per day by age 67. This change may be attributed to the slowing of blood circulation with age.
In addition to slowing growth, nails may also undergo changes in appearance and texture as we age. These changes can include discolouration, such as yellowing or opaque nails, and the development of longitudinal ridges. While some changes are natural, others may indicate underlying health issues. For example, dark stripes on the nails could signal melanoma or malignant skin cancer, while very rounded nails (clubbing) can be a sign of long-term oxygen deprivation. Therefore, it is important to consult a healthcare provider if you notice significant changes in your nails as you age.
Practising good nail hygiene and maintaining a healthy diet can help support nail health as we age. While there are no scientifically proven methods to accelerate nail growth, certain vitamins and supplements can strengthen nails and prevent breakage, allowing them to grow longer. Additionally, keeping nails trimmed and moisturised is essential for overall nail health.
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Toenails grow much slower than fingernails
Toenails grow at a much slower rate than fingernails. While fingernails grow at an average rate of 3.47 mm per month, toenails only grow at 1.62 mm per month. This means that if you lose a toenail, it can take up to a year and a half for it to completely grow back, which is three times longer than it would take for a fingernail to regrow.
There are several factors that influence the speed of nail growth. One factor is the amount of trauma the nail is subjected to. Nails on the dominant hand, for example, tend to grow faster because they are used more often and are therefore more prone to trauma. Similarly, toenails are generally subjected to less trauma than fingernails, which could explain why they grow more slowly.
Age also plays a role in nail growth. As we age, our blood circulation slows down, which can result in slower nail growth. Hormones can also affect nail growth rates, with pregnancy and puberty being key times when growth rates may increase.
The evolution of nails from claws, which occurred around 55 million years ago, may also have an impact on their growth rate today. Nails and claws have been found to have a common evolutionary origin, with the fossil record showing that the last common ancestor of primates had evolved nails on most of its toes but retained a "toilet-claw" on its second toe for grooming.
In addition to these factors, the season can also affect nail growth, with nails growing faster during the summertime. Overall, while there are some variations in growth rates, toenails consistently grow at a slower pace than fingernails.
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Trauma stimulates nail growth
Trauma to the nail can cause a variety of issues, including temporary or long-term changes in their shape, texture, and colour. Nail trauma can be caused by a blow to the nail, catching your finger in a door, or even hitting your nail on a hard surface. More severe trauma includes crushing injuries or deep cuts, which may result in permanent damage if the nail matrix is significantly harmed.
The nail matrix, the tissue inside the cuticle where new nail cells are formed, is responsible for 90% of nail growth. When trauma occurs, the impact can disrupt the normal growth cycle, causing the nail to grow unevenly or distortedly. In some cases, the nail may grow more slowly or even stop growing temporarily as it recovers from the injury.
After an injury, it is common for nails to show temporary changes as they heal, such as bruising, ridges, or a rough surface. These typically resolve over time as the damaged nail grows out and new, healthy cells replace the affected area. However, severe injuries that involve the nail matrix may result in lasting changes, such as chronic thickening, uneven growth, or even complete and permanent nail loss.
To promote healing and prevent deformities after a nail injury, it is important to properly manage the trauma. Minor injuries may heal without intervention, but keeping the area clean can speed up recovery. For more severe cases, a doctor may need to trim damaged sections, drain blood under the nail, or perform surgical procedures if necessary. While the nail may eventually return to its original appearance, profound matrix damage could require ongoing care or reconstructive approaches.
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Nutritional deficiencies can cause slow nail growth
Nail changes in nutritional deficiencies are usually minor and non-specific. It is often difficult to suspect a nutritional deficiency state by observing nail changes. However, some nutritional anomalies can also affect the nail bed, and the changes may be visible clinically or through biochemical investigation.
One of the most common nail problems is brittle, weak, and peeling nails. These symptoms are often the result of a poor diet or nutritional deficiency. For example, brittle nails might be a sign of hypothyroidism or iron deficiency. Weak nails might be associated with a deficiency in vitamin B or calcium. Soft nails might be caused by overexposure to moisture or chemicals, but they can also break easily or bend before snapping.
Scattered white spots on the nails can signify a zinc deficiency. Black lines, which can appear brown or dark red and look like splinters, could be a sign of an underlying issue such as psoriasis, endocarditis, or nail melanoma. Beau's lines, transverse linear depressions in the nail plate, are among the most common yet least specific signs of nutritional deficiency encountered in clinical practice. Nutritional causes include protein deficiency and the malnourished state associated with chronic alcoholism.
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Frequently asked questions
Yes, thumbnails grow slower than the rest of the fingernails. The middle nail grows the fastest, while the little finger grows slower than the other nails except the thumb.
The rate of nail growth depends on the amount of blood flow to the finger. Nails grow faster in the summer than in winter, as blood flow is restricted in cold weather. Thumbnails grow slower because the thumb is shorter than the other fingers, and the growth rate is correlated with the length of the finger.
There are no scientifically proven methods to make thumbnails grow faster. However, you can increase the overall health of your nails by practising good nail hygiene and taking biotin.
