Liam Carter
Fingernails are composed of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns of vertebrates. They serve as a protective plate at the tip of our fingers and toes, helping to shield them from harm. The average rate of fingernail growth is approximately 3.5 mm per month, and they require 3 to 6 months to completely regrow. Despite their apparent durability, fingernails can be prone to various issues such as ingrown nails, injuries, deformities, and hangnails. Additionally, the appearance of fingernails can provide valuable insights into an individual's overall health, with certain nail abnormalities indicating potential medical conditions. With their functionality and aesthetic appeal, fingernails are an important part of our daily lives, whether it's for scratching an itch or enhancing our sense of touch.
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What You'll Learn
Fingernail growth rate
Fingernails are protective plates found at the tips of the fingers and toes of all primates, corresponding to the claws in other tetrapod animals. They are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. The nail consists of the nail plate, the nail matrix, and the nail bed below it, as well as the grooves surrounding it. The nail matrix is the active tissue that generates cells, which harden as they move outward from the nail root to the nail plate.
Fingernails grow at an average rate of approximately 3.5 mm per month, or about a tenth of a millimeter per day. The growth rate varies depending on age, sex, season, exercise level, diet, and hereditary factors. For example, the nails on the dominant hand tend to grow faster, possibly due to more frequent use and trauma, which stimulates circulation in the nail bed. Similarly, nails grow faster during the day and in the summer.
The rate of growth also depends on which finger the nail is on. For example, the little finger's nail grows slower than the other fingernails. Additionally, nail growth tends to slow down with age, possibly due to a decrease in blood circulation. Hormone levels can also affect nail growth rates, with pregnancy and puberty being associated with faster growth.
Overall, it takes about three to six months for fingernails to regrow completely, while toenails require twelve to eighteen months. The health of an individual can also impact nail growth rate, with certain medical conditions, malnutrition, and infections potentially slowing it down. Good nail hygiene, including keeping nails clean and dry, trimming them regularly, and avoiding biting them, can promote nail growth and prevent brittleness and breakage.
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Toenail growth rate
Toenails grow at a much slower rate than fingernails. While the nails on your fingers grow at an average rate of 3.47 to 3.5 millimetres per month, your toenails only grow at a rate of around 1.6 millimetres per month. This means that it takes toenails between 12 to 18 months to grow out completely, whereas fingernails only take three to six months to regrow.
The rate of toenail growth is influenced by various factors, including age, sex, season, exercise level, diet, hereditary factors, and overall health. For instance, toenail growth may be slower in people with certain medical conditions, such as those who are immunocompromised, paralysed, malnourished, or undergoing certain drug therapies. Toenail growth may also be slower in older people, as health conditions that impact nail growth are more common in older age.
Additionally, the growth rate of toenails can be affected by environmental, behavioural, and genetic factors. For example, the nails on your dominant hand tend to grow faster, possibly due to more frequent use and trauma. Similarly, nail growth may be faster in the summertime and during pregnancy, while it may slow down during lactation.
Practising good nail hygiene and eating a nutritious, well-balanced diet can help promote nail growth and keep your toenails healthy. This includes keeping your nails clean and dry, trimming them regularly, and avoiding biting them or clipping them too short.
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Fingernail and toenail composition
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. The nail consists of the nail plate, the nail matrix, and the nail bed below it, along with the grooves surrounding it. The nail plate, also known as the nail body, is the visible hard nail area from the nail root to the free edge, made of translucent keratin protein. The nail plate is strongly attached to the nail bed and does not contain any nerves or blood vessels. The free margin or distal edge is the anterior margin of the nail plate, corresponding to the abrasive or cutting edge of the nail. The hyponychium, informally known as the "quick", is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. It forms a seal that protects the nail bed. The onychodermal band is the seal between the nail plate and the hyponychium.
The nail matrix, also known as the matrix unguis, keratogenous membrane, or onychostroma, is the active tissue or germinal matrix that generates cells. The cells harden as they move outward from the nail root to the nail plate. The nail matrix is the part of the nail bed that is beneath the nail and contains nerves, lymph, and blood vessels. The matrix produces cells that become the nail plate. The width and thickness of the nail plate are determined by the size, length, and thickness of the matrix, while the shape of the fingertip bone determines the shape of the nail plate.
Nails support and protect the sensitive tips of our fingers and toes. They also help us to pick up objects, scratch an itch, or untie a knot. Fingernails grow about three times faster than toenails, with fingernails growing at an average rate of approximately 3.5 mm a month, while toenails grow at an average rate of approximately 1.6 mm a month. The actual growth rate of nails is dependent on age, sex, season, exercise level, diet, and hereditary factors.
Nail problems are common and affect people of all ages. Common causes of fingernail problems include injury, infection, and skin diseases such as eczema and psoriasis. Toenail problems tend to be more common among older people and can be caused by trauma, ill-fitting shoes, poor circulation, poor nerve supply, and infection.
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Fingernail and toenail maintenance
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns of vertebrates. The nail consists of the nail plate, the nail matrix, and the nail bed. The nail plate is the hard, outer part of the nail that we can see, and it is made of several layers of dead, compacted cells that make it strong yet flexible. The nail matrix is the active tissue that generates cells, and the nail bed is the part beneath the nail that contains nerves, lymph, and blood vessels.
Nails support and protect the sensitive tips of our fingers and toes, and they also help us to pick up objects, scratch an itch, or untie a knot. Fingernails grow at an average rate of approximately 3.5 mm per month, while toenails grow at about half that rate. As our body ages, the growth rate of our fingernails and toenails tends to slow down, and the change of protein in the nail plate makes nails brittle and prone to splitting. Discoloration and thickening are also common with age.
To maintain healthy fingernails and toenails, it is important to keep them clean and trimmed. Basic nail care can be done at home, and all you need to do is keep the nails clean and at a safe length. Trim your nails regularly, and check them each week to see if they need to be trimmed again. It is usually easiest to trim nails after a shower or foot bath when they are softer. When trimming toenails, trim them straight across, leaving them a little longer at the corners to prevent the sharp ends from cutting into the skin. Use a nail file to gently smooth the edges of the nails, especially at the corners.
If you are caring for someone else's nails, remember not to trim or cut the cuticles. Additionally, if the person has diabetes or foot problems such as bunions or corns, consider taking them to see a podiatrist, who can provide professional trimming, shaping, and care of the toenails. A podiatrist can also help diagnose and treat more serious nail problems, such as fungal infections, lichen planus infection, and deformed growth of the nail plate.
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Fingernail and toenail health indicators
Fingernails and toenails are made of a tough, rigid protein called alpha-keratin, which is also found in claws, hooves, and horns of vertebrates. The health of an individual's nails can be indicative of their overall health and nutrition. Nails are extensions of the skin, and just like our skin, they can tell us a lot about what is going on inside our bodies.
Colour
Changes in the colour of nails can indicate an infection of the nail itself, or an underlying health condition. Yellow nails, for example, can be caused by smoking, nail lacquers, or acrylic nails. However, yellow nails can also be a symptom of yellow nail syndrome, a rare disorder that causes thick yellow nails, usually accompanied by respiratory issues and limb swelling. White spots on nails, known as leukonychia, can be a sign of heavy metal poisoning with lead or arsenic, or psoriasis. Black discoloration or painful growths on the nails could be a sign of melanoma, a type of skin cancer, and should be checked by a healthcare professional as soon as possible.
Shape
Healthy nails should be convex, curving slightly outwards, and should not contain any dips or craters. Koilonychia, or spoon nails, is a condition in which the nail curves inwards and appears thin and brittle. This condition can be a sign of anaemia, an iron deficiency, or other conditions such as inflammatory skin diseases like psoriasis or autoimmune disorders. Clubbing, a condition in which the ends of the fingers swell and the nails become curved and rounded, can be a sign of liver or kidney disease, lung disease, or gut disorders.
Texture
Nail texture can also be indicative of health issues. For example, brittle nails can be caused by repeated wetting and drying of the nails, or by hypothyroidism or iron deficiency. Soft nails that break easily can be caused by overexposure to moisture, while nail pitting, or small dents on the nail surface, could be a sign of psoriasis or other skin diseases.
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Frequently asked questions
Nails don't grow on the floor. They grow from the nail root, which is hidden under the cuticle. The nail matrix produces cells that harden as they move outward from the nail root to the nail plate, causing the nail to grow.
If you find nails on the floor, you should dispose of them safely, especially if they are large or sharp. You can use a dustpan and brush to sweep them up and then place them in a bin. If you are unable to pick them up safely, you can also vacuum them.
Fingernails should be trimmed regularly, approximately every 3-6 months, to maintain a healthy length and shape. Toenails, on the other hand, take longer to grow and typically require trimming every 12-18 months.
Changes in the appearance of your nails can sometimes indicate underlying health issues. Some signs that you should consult a doctor or dermatologist include persistent nail biting or picking, nail deformities, ingrown nails, injuries, infections, and abnormal nail colour.
