
Spoon nails, also known as koilonychia, are nails that are indented or concave, giving them a spoon-like appearance. This nail abnormality can be found in newborns, children, and adults. Spoon nails are usually a symptom of an underlying medical condition, such as iron deficiency or anaemia, and can be a sign of more serious health concerns.
| Characteristics | Values |
|---|---|
| Name | Koilonychia |
| Description | Nails that are indented or concave, like spoons |
| Causes | Iron deficiency, vitamin B deficiency, lupus, heart disease, celiac disease, altitude, hereditary |
| Treatment | Treat the underlying cause |
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What You'll Learn

Spoon nails are indented nails or spoon-shaped (concave) nails
Spoon nails, also known as koilonychia, are indented nails or spoon-shaped (concave) nails. The name is derived from the Greek word 'koilos', meaning 'hollow', and 'onikh', meaning 'nail'. This nail abnormality is characterised by thin, brittle, concave nail dystrophy, either placed horizontally or vertically. The nail plate seems to be centrally depressed and everted laterally.
Spoon nails usually develop on fingernails, but they can also occur in toenails. They can affect just one nail, a few, or all of them. Spoon nails are often a sign of iron deficiency, or anaemia, which causes a lower level of red blood cells than normal. However, they can also be caused by other conditions, such as lupus, heart disease or celiac disease, or by nutritional deficiencies such as a lack of vitamin B. Spoon nails can also be hereditary or caused by environmental factors, such as living at a higher altitude.
Spoon nails are usually a symptom of an underlying medical condition, rather than an infection. However, people with fungal nail infections can sometimes develop spoon nails, often accompanied by inflammation or irritation. In newborns, children and adults, spoon nails can indicate more serious health concerns. Therefore, it is important to investigate further if a patient presents with this symptom.
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Spoon nails are usually a sign of iron deficiency
Spoon nails, or koilonychia, are nails that are indented or concave, like spoons. They can develop on both finger and toenails, and are usually a sign of iron deficiency, or anaemia. This condition is characterised by lower than normal levels of red blood cells. Spoon nails can also be a sign of other underlying medical conditions, such as lupus, heart disease or celiac disease.
In some cases, spoon nails may be hereditary or caused by environmental factors. For example, one study found that over 47% of people living at a higher altitude had spoon nails. Spoon nails can also be caused by fungal nail infections, although this is usually accompanied by inflammation or irritation.
If you have spoon nails, it is important to consult a medical professional to determine the underlying cause and receive appropriate treatment. Treating the underlying cause will usually resolve the issue of spoon nails.
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Spoon nails can be hereditary or caused by your environment
Spoon nails, or koilonychia, are nails that are indented or concave, like spoons. They can be hereditary or caused by your environment.
Koilonychia is derived from the Greek word 'koilos', meaning 'hollow', and 'onikh', meaning 'nail'. This nail abnormality can be found in newborns, children, and adults. It is characterised by thin, brittle, concave nail dystrophy, either placed horizontally or vertically, where the finger or toenail plate seems to be centrally depressed and everted laterally.
Spoon nails are usually a sign of iron deficiency or anaemia, which causes a lower level of red blood cells than normal. They can also be caused by nutritional deficiencies, such as a lack of vitamin B, or underlying medical conditions such as lupus, heart disease, or celiac disease. In some cases, spoon nails may be a symptom of a fungal nail infection, which is often accompanied by inflammation or irritation.
One study found that people who lived in higher altitudes were more likely to have spoon nails, with over 47% of participants exhibiting the condition. This suggests that environmental factors, such as altitude, may play a role in the development of spoon nails.
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Spoon nails are a symptom, not an infection
Spoon nails are usually a sign of an underlying medical condition, most often iron deficiency or iron deficiency anaemia. However, spoon nails can also be caused by other nutritional deficiencies, such as a lack of vitamin B, or by conditions such as lupus, heart disease or celiac disease. In some cases, spoon nails may be hereditary or caused by environmental factors, such as living at a higher altitude.
If you have a fungal nail infection, you may also develop spoon nails, but this is usually accompanied by inflammation or irritation. Spoon nails can occur in both fingernails and toenails, and they may affect just one nail, a few nails, or all of them.
If you notice spoon nails, it is important to investigate further to rule out any serious health concerns. Treatment for spoon nails involves addressing the underlying cause.
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Spoon nails can be a sign of lupus, heart disease or celiac disease
Spoon nails, or koilonychia, are nails that are indented or concave, like spoons. They can be a sign of iron deficiency or anaemia, which causes a lower level of red blood cells than normal. Spoon nails can also be a sign of more serious health concerns, such as lupus, heart disease or celiac disease.
Koilonychia is derived from the Greek word 'koilos', meaning 'hollow', and 'onikh', meaning 'nail'. The condition can be found in newborns, children and adults, and can be hereditary or congenital, acquired or idiopathic. Spoon nails are usually found on the fingernails, but they can also occur on toenails. They can affect just one nail, a few nails, or all of them.
If you have a fungal nail infection, you may also develop spoon nails, although this is usually accompanied by inflammation or irritation. Spoon nails can also be caused by environmental factors, such as living at a higher altitude. In one study, over 47% of people living at a higher altitude had spoon nails.
If you have spoon nails, it is important to look into any underlying health concerns that may be present. Treating the underlying cause will usually get rid of spoon nails.
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Frequently asked questions
Spoon-shaped nails are known as koilonychia. They are usually a sign of an iron deficiency.
Koilonychia comes from the Greek word 'koilos', meaning 'hollow', and 'onikh', meaning 'nail'.
Spoon nails are indented and concave, instead of growing straight. They can be found on both finger and toenails.
Spoon nails are usually caused by an underlying medical condition, such as lupus, heart disease or celiac disease. They can also be caused by nutritional deficiencies, such as a lack of iron or vitamin B.
Spoon nails can usually be treated by addressing the underlying cause.











































