Noah Sinclair
There are several reasons why fingernails might curl inwards at the sides. The most common cause is nail trauma or injury, but it can also be caused by vitamin or mineral deficiencies, such as iron or B12. In some cases, it could be a result of tight footwear or improper nail cutting, which can lead to ingrown nails. Additionally, it could be related to underlying health issues such as diabetes, biomechanical issues, or a fungal disease. While there may not be a permanent solution to stop inward curving, temporary relief can be achieved through creative shaping and proper nail care.
| Characteristics | Values |
|---|---|
| Cause | Nail trauma or injury, vitamin or mineral deficiency, increased blood flow to the fingertips, genetics, or an underlying health issue |
| Prevention/Treatment | Keeping nails moisturized and oiled, taking supplements with biotin, using cuticle oil or Vaseline, soaking nails in warm oil, or creative shaping |
| Related Issues | Breakages, brittle nails, pain, swelling, tearing, thickening of the tissue underneath the nail, infection, or respiratory issues |
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What You'll Learn
Nail trauma and injury
The main reason nails curve inwards at the sides is due to nail trauma and injury. A fingernail or toenail can be injured by a blow to the nail or by trapping the finger or toe in a door or drawer. This kind of trauma commonly results in blood under the nail, known as subungual haematoma. Nails can also be accidentally torn or split, or a splinter can get under the nail. Repeated trauma to toenails, caused by ill-fitting shoes, can lead to deformities in the nails. Deformities may resemble a fungal infection, with thickened or discoloured nails that lift away from the nail bed.
Other habits that can cause trauma to the nails include nail biting and cuticle biting. Nail biting is a main cause of acute paronychia, a type of infection where bacteria get underneath the tissue at the side of the nail, causing swelling and irritation. Repetitive picking at the thumb nail and cuticle with the index finger can produce a line of horizontal hatch marks in the middle of the nail.
If the nail is torn or jagged, it should be trimmed to avoid further injury. If the nail lifts completely off the nail bed, it may be most comfortable to replace the nail and hold it in place with a bandage. Nails will not reattach to the nail bed after they have separated from it, but a new nail will usually regrow. If blood under the nail occupies more than half the nail area, a physician should evaluate the finger, as it could indicate an underlying bone fracture or tissue tear.
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Vitamin and mineral deficiencies
While there are several reasons why fingernails may curl inwards at the sides, vitamin and mineral deficiencies are a common cause. Nails are a part of the body's outer layer, or integumentary system, which acts as a barrier between the outside world and the internal body. As such, fingernails can be a good indicator of overall health and dietary balance.
Vitamin B and C deficiencies, along with protein and calcium deficiencies, can cause nails to become unhealthy, weak, and brittle. In addition, a vitamin B12 deficiency can affect the colour of your nails, causing them to become bluish or grey-brown. Iron deficiency is also associated with brittle nails, and in more severe cases, spoon-shaped nails. A biotin deficiency can also cause nails to become brittle and prone to breaking.
Mineral deficiencies can also cause nail abnormalities. For example, patients with reduced plasma magnesium levels may develop soft, flaky nails that are prone to breaking or splitting. Selenium deficiency has been linked to white fingernails, and clubbing of nails is associated with iodine deficiency. Vitamin A and D deficiencies have been associated with soft nails, and longitudinal melanonychia of the nail plate has been observed in vitamin D deficiency.
While vitamin and mineral deficiencies can affect nail health, it is important to note that other factors can also cause changes in nail appearance. These include dehydration, age, and genetics. Additionally, certain diseases, gel manicures, and restrictive diets can also impact nail health.
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Genetics
While there are several reasons why fingernails may curl inwards at the sides, genetics is one of the possible causes. A certain genetic predisposition may cause some individuals' nails to curl inwards at the sides more than others. This condition is known as koilonychia, where the nails start to curve like a spoon. It is often a sign of another condition and can be triggered by various factors, including genetic ones.
Some genetic factors that can cause nail changes include hemochromatosis, where the person absorbs too much iron from their diet, and nail-patella syndrome, which affects the nails, kneecaps, hip bones, and elbows. In addition to genetic factors, dietary factors can also contribute to koilonychia. For example, iron deficiency is the most frequent cause of the condition, and people with a genetic predisposition to not absorbing plant-based sources of iron effectively may be at higher risk.
While genetics may play a role in nail curling, it is important to note that other factors, such as trauma, injury, and vitamin deficiencies, can also contribute to this condition. If you are concerned about your fingernails curling inwards, it is recommended to consult a healthcare professional for proper diagnosis and guidance.
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Natural nail shape
There are several reasons why your fingernails might curl inwards at the sides. The main cause is nail trauma and injury. It can also be due to vitamin or mineral deficiencies, such as iron or B12. In more severe cases, it can indicate a health complication, such as respiratory issues. This condition, known as ingrown nails, can also be caused by wearing tight shoes or cutting nails improperly. While there is no permanent solution, the curling can be temporarily relieved with creative shaping and tools.
Now, on to natural nail shapes. Each person's nails are unique, and their natural nail shape is determined by their lifestyle choices, daily routine, and genetics. There are six primary nail bed types, influencing how long nails can grow and how long treatments will last. Here are some popular natural nail shapes:
Almond Nails
Almond nails are a classic and elegant shape. They are vertically long with long straight sidewalls and a beautiful arch, providing natural support and strength. This shape is easy to maintain, and nail treatments or extensions will grow out without distortion. To achieve this look, file your nails to a long, tapered point at the nail bed.
Squoval Nails
The squoval shape is a combination of square and oval. It features a square tip with gently rounded edges and a straight line across the centre. This shape is low-maintenance and can be achieved by filing the sides of the nails while keeping the centre straight.
Square Nails
Square nails are best suited for those with long fingers and slim nails as they visually shorten fingers and add width. This shape is modern, cool, and low-maintenance. To achieve it, trim your nails straight across the top with clippers and use a file to smooth the edges.
Round Nails
Round nails are perfect for those with wide nail beds or those who want to elongate the look of their hands and fingers. This shape is easy to create at home, especially for short nails. File your nails in one direction, following the natural line of your cuticle, to create a gentle rounded tip.
Egg-shaped Nails
Egg-shaped nails are similar to round nails but harder to grow without the ends curving over. They require regular nail shortening and rebalancing to maintain.
When shaping your natural nails, it is recommended to use a glass nail file as it is more hygienic and precise than a standard emery board. It also smooths and seals the edges, preventing breaks and peeling. Additionally, keeping your nails painted can help create more even and symmetrical nail shapes.
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Underlying health conditions
Nails that curve far inward at the sides are called ingrown nails. This condition may be due to external factors such as ill-fitting shoes, particularly in the toe box, or cutting your nails improperly. However, it can also be due to underlying health conditions.
Curving nails can indicate a vitamin or mineral deficiency, such as iron or B12. Iron deficiency can be caused by various factors, including high altitude, and can lead to thin, spoon-shaped nails that dip down in the middle. In some cases, an iron deficiency may be due to hemochromatosis, a rare genetic disorder that causes the body to absorb too much iron from the diet. This condition can damage vital organs, including the liver, heart, and pancreas.
Nail abnormalities, including changes in shape, thickness, or colour, can sometimes be a sign of an underlying health issue. For example, about 90% of people with psoriasis develop the condition on their nails at some point, with symptoms including nail curving, thickening, and shallow or deep holes in the nail. Additionally, curving nails can be a symptom of clubbing, a condition caused by increased blood flow to the fingertips, resulting in thickened tissue underneath the nail and rounded fingertips. Clubbing can be harmless and run in families, but it may also indicate a more severe health complication, especially if it occurs later in life.
Other possible underlying health conditions that can cause nail curving include respiratory issues and fungal infections. Changes in nail colour, such as a new or changing dark streak, can also be a sign of melanoma, the most serious type of skin cancer. Therefore, it is recommended to consult a healthcare professional for a proper diagnosis and treatment if you notice persistent, noticeable changes to your nails, especially if other symptoms are present.
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Frequently asked questions
There are several reasons why fingernails might curl inwards at the sides. The most common causes are nail trauma or injury, vitamin or mineral deficiency, and dehydration. In some cases, it could be genetic or indicate an underlying health issue.
While there is no permanent solution to stop nails from curling inwards, there are temporary fixes you can try. Keeping your nails moisturised and strong is key. You can also try shaping them creatively and taking supplements with biotin.
In some cases, yes. Curved nails can indicate an underlying health issue such as iron deficiency, anemia, or a fungal infection. In more severe cases, it could be a sign of respiratory issues or chronic conditions like psoriasis. If you're concerned, consult a doctor.
The shape of nail curvature varies and includes flat nails, wide C-curve nails, and ingrown nails. Ingrown nails are where the nail curves far inward and can affect both finger and toenails.
