Caleb Foster
Nails curving inward can be a result of various factors, including age, nutrition, and health. In some cases, it may be a natural trait, while in others, it may indicate underlying health issues such as nutrient deficiencies, respiratory problems, or thyroid disorders. Curved nails can also be a result of trauma to the nail bed or cuticles, causing the nail plate to grow unevenly or become ridged. Understanding the causes of nail curvature can help identify potential health issues and determine whether medical advice is necessary.
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What You'll Learn
Iron deficiency
Koilonychia, commonly known as spoon nails, is a condition where nails have an indented shape, like a spoon. Spoon nails are often a sign of iron deficiency. They can also be a result of poor blood flow to the hands or feet, or an autoimmune disease such as lupus. In addition, spoon nails can be hereditary, or caused by injury to the nail bed, such as thumb-sucking in babies and toddlers, or wearing shoes that are too tight.
While the exact mechanism is not fully understood, researchers believe that iron deficiency may cause spoon nails due to reduced iron levels in iron-containing enzymes in epithelial cells, which cover the inside and outside skin surfaces of the body. The nail bed epithelium lies between the nail bed and the nail plate, allowing the nail plate to grow over the nail bed while remaining attached. Iron deficiency may also weaken the connective tissue under the nail plate, leading to spoon nails.
Treating iron deficiency can lead to healthier nails. Increasing iron intake through dietary changes or supplements may help resolve spoon nails and brittle nails. Iron-rich foods include beans, lentils, dark chocolate, fortified bread and cereals, leafy greens such as spinach and kale, meat, seafood, nuts, and seeds. It is important to consult a healthcare provider to determine the underlying cause of nail issues and to rule out any health conditions.
In addition to iron deficiency, nail issues can be caused by external factors such as the use of acrylic nails, gel manicures, and exposure to water and chemicals. Internal factors such as illness, nutrient deficiencies, and thyroid disease can also contribute to nail problems.
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Respiratory problems
Inward-growing nails, also known as koilonychia or spoon nails, can be a sign of respiratory problems. This condition is characterised by indented nails that resemble spoons, with a deep enough indentation to hold a drop of water. Spoon nails are often a result of iron deficiency, which is the world's most common nutritional deficiency disease. It is particularly prevalent among children and women of childbearing age. People who live at high altitudes are also at a higher risk of developing spoon nails due to the reduced oxygen levels in the air.
Spoon nails can be indicative of respiratory issues, such as lung diseases, including lung cancer, lung infections, interstitial lung disease, and cystic fibrosis. These conditions can cause changes in the appearance and structure of nails, often making them wider, spongy, or swollen. Additionally, disorders that affect oxygen levels in the blood, such as heart problems or lung diseases, can contribute to nail clubbing, a condition where nails curve around the fingertips.
Underlying health issues, such as lung diseases, can impact nail growth patterns. Curved nails may be a sign of low oxygen levels in the blood, indicating potential respiratory problems like asthma or chronic bronchitis. It is crucial to monitor nail changes and consult a healthcare professional if significant alterations are observed.
Treating the underlying respiratory conditions may help nails regain their normal shape. However, it is important to note that resolving the respiratory issues may not always lead to immediate changes in nail growth or shape. It can take a significant amount of time, ranging from six to eighteen months, for the nails to recover and grow normally again.
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Thyroid disorders
The thyroid is a butterfly-shaped gland in the neck that produces hormones, which play a key role in regulating heartbeat, breathing, and many other functions. Thyroid hormones also play a role in growth and development, including nail growth. Therefore, thyroid disorders can affect the growth and health of your nails.
An underactive thyroid gland, a condition called hypothyroidism, can cause nails to grow slowly and become thin, fragile, and brittle. They may break, split, and peel. Sometimes, they may separate from the skin underneath, a condition known as onycholysis. Onycholysis is an early indicator of thyroid disease. Other nail changes associated with hypothyroidism include ridges, grooves or depressions in the nail (Beau's lines), and lamellar dystrophy, where the nail splits into horizontal layers.
An overactive thyroid, or hyperthyroidism, can also lead to nail changes. Most commonly, it leads to spoon-shaped nails, known as koilonychia, and clubbing, where the fingertips become enlarged and the nails curve around them, resembling a club.
Nail changes may help with the early detection and diagnosis of a thyroid disorder. According to a 2022 study, those with a thyroid disorder frequently report nail brittleness. In fact, those with autoimmune thyroid disorders like Hashimoto’s or Graves’ disease had a higher percentage of nail brittleness than those with a non-autoimmune thyroid condition.
If you notice any changes in your nails, it is recommended to consult your healthcare provider, as it may be indicative of an underlying medical condition, including thyroid dysfunction.
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Habit-tic nail trauma
The characteristic changes to the nail in habit-tic nail trauma include central depression and transverse, parallel ridging, running from the nail fold to the distal edge of the nail. In some cases, the cuticles may be completely absent, and the lunulae may hypertrophy. Unlike fungal infections, habit-tic nail trauma does not result in nail thickening or onycholysis.
Effective treatments for habit-tic nail trauma include addressing the underlying behavioural causes and preventing further trauma to the nail. Physical barriers, such as tape or instant glue applied to the nail folds, can help prevent picking and biting. Additionally, interventions targeting anxiety management, such as trials of serotonin reuptake inhibitors, may be beneficial in refractory cases associated with obsessive-compulsive behaviours.
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Nail-patella syndrome
Inward-growing nails can be indicative of underlying health issues. One such condition is koilonychia, which is often caused by iron deficiency. However, in some cases, inward-nail growth is associated with Nail-patella syndrome, a rare genetic disorder.
The syndrome is primarily caused by mutations in the LMX1B gene, which plays a crucial role in embryonic development. These mutations lead to the production of a non-functional or shortened protein, affecting its ability to bind to DNA. The LMX1B protein is involved in limb patterning and exhibits a normal gradient of expression, which explains the decreasing severity of symptoms from anterior to posterior and from distal to proximal.
The nails of individuals with Nail-patella syndrome may be absent, underdeveloped, discoloured, split, ridged, or pitted. The fingernails are typically more affected than toenails, with thumbnails usually being the most severely impacted. Additionally, the lunulae, or areas at the base of the nails, often exhibit a triangular shape instead of the usual crescent shape.
Beyond nail abnormalities, individuals with Nail-patella syndrome commonly experience skeletal issues involving the knees, elbows, and hips. The kneecaps may be small, irregularly shaped, or absent, with patellar dislocation being a common occurrence. Some individuals may have difficulty fully extending their arms or turning their palms upward while keeping their elbows straight. Elbow deformities, such as outward angling (cubitus valgus) or abnormal webbing, can also be present.
The condition may also affect other areas of the body, particularly the eyes and kidneys. Individuals with Nail-patella syndrome are at an increased risk of developing glaucoma, characterised by elevated intraocular pressure, at an early age. While there is no cure for Nail-patella syndrome, treatments are available to manage symptoms and improve quality of life.
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Frequently asked questions
Curved nails can be a natural trait or a sign of nail health issues. Iron deficiency is the most common cause of curved nails, but they can also be a sign of other health problems, including respiratory problems, lung conditions, or liver issues.
Curved nails can be a sign of potential respiratory problems, such as asthma or chronic bronchitis. They may also indicate lung conditions, such as bronchiectasis, or liver issues. In some cases, curved nails can be a sign of iron deficiency anaemia or other nutritional deficiencies.
If your curved nails are due to nutritional deficiencies, improving your diet or taking supplements may help. It's important to consult a healthcare professional for advice and guidance on treating curved nails.
Yes, in some cases, curved nails can be caused by habit-tic nail trauma, which is related to obsessive-compulsive behaviours and underlying anxiety. This can occur when individuals frequently pick at their cuticles, traumatizing the cells in the matrix and causing the nail plate to grow out unevenly.
Yes, a similar condition to curved nails is known as clubbed nails, which involves swelling at the fingertips and a more dramatic downward curvature of the nails. Clubbed nails can indicate serious health issues and should be monitored closely.
