
Koilonychia, also known as spoon nails, is a nail disease that can be a sign of hypochromic anaemia, especially iron-deficiency anaemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing. In early stages nails may be brittle and chip or break easily.
| Characteristics | Values |
|---|---|
| Name | Koilonychia, Spoon Nails, Spoon-Shaped Nails |
| Description | Abnormally thin nails that have lost their convexity, becoming flat or concave in shape |
| Causes | Iron deficiency, malnutrition, gastrointestinal blood loss, worms, gastrointestinal malignancy, celiac disease, high altitude, trauma, exposure to petroleum products, heredity, occupational changes |
| Prevention/Treatment | Eat a nutritious diet, wear gloves when working with chemicals or washing dishes, avoid nail biting and picking, ensure shoes fit well, keep feet clean and dry |
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What You'll Learn
- Koilonychia, also known as spoon nails, is a nail disease that can be a sign of iron-deficiency anaemia
- Koilonychia is when your fingernails have raised ridges and scoop outward, like spoons
- Spoon-shaped nails should prompt an evaluation for possible iron deficiency and the underlying cause
- Koilonychia is associated with Plummer–Vinson syndrome and iron deficiency anemia
- Koilonychia has also been associated with lichen planus, syphilis, and rheumatic fever

Koilonychia, also known as spoon nails, is a nail disease that can be a sign of iron-deficiency anaemia
Koilonychia is associated with Plummer–Vinson syndrome and iron deficiency anaemia. It has also been associated with lichen planus, syphilis, and rheumatic fever. Other causes of koilonychia are high altitude, trauma, and exposure to petroleum products, and it can even be hereditary.
If you have koilonychia, it is recommended that you don't bite your nails or pick at them. Make sure that your shoes fit, and keep your feet clean and dry if your toenails are affected. Don't use nail polish until your nails have returned to normal. Wear gloves to protect your hands when working with chemicals or washing dishes. Eat a nutritious diet.
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Koilonychia is when your fingernails have raised ridges and scoop outward, like spoons
Koilonychia, also known as spoon nails, is a nail disease that can be a sign of hypochromic anaemia, especially iron-deficiency anaemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In other words, koilonychia is when your fingernails have raised ridges and scoop outward, like spoons. In some cases, the nail is curved enough to hold a drop of liquid.
Koilonychia is associated with Plummer–Vinson syndrome and iron deficiency anaemia. It has also been associated with lichen planus, syphilis, and rheumatic fever. However, it is more likely to be seen as an occupational change in nails and may be idiopathic.
Other causes of koilonychia include high altitude, trauma, and exposure to petroleum products, and it can even be hereditary. If you have spoon-shaped nails, it is recommended that you evaluate your iron levels and investigate the underlying cause.
To treat koilonychia, it is important to avoid biting or picking at your nails. Ensure that your shoes fit properly and keep your feet clean and dry if your toenails are affected. Avoid using nail polish until your nails have returned to normal. Protect your hands by wearing gloves when working with chemicals or washing dishes. Finally, maintain a nutritious diet to support nail health.
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Spoon-shaped nails should prompt an evaluation for possible iron deficiency and the underlying cause
Spoon-shaped nails, also known as koilonychia, are a nail disease that can be a sign of hypochromic anaemia, especially iron-deficiency anaemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing. In the early stages, nails may be brittle and chip or break easily.
Koilonychia is associated with Plummer–Vinson syndrome and iron deficiency anaemia. It has also been associated with lichen planus, syphilis, and rheumatic fever. The condition has also been linked to high altitude, trauma, and exposure to petroleum products, and it can even be hereditary. Therefore, spoon-shaped nails should prompt an evaluation for possible iron deficiency and the underlying cause.
If you have spoon-shaped nails, it is recommended that you don't bite your nails or pick at them. Make sure that your shoes fit, and keep your feet clean and dry if your toenails are affected. Don't use nail polish until your nails have returned to normal. Wear gloves to protect your hands when working with chemicals or washing dishes. Eat a nutritious diet.
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Koilonychia is associated with Plummer–Vinson syndrome and iron deficiency anemia
Koilonychia, also known as spoon nails, is a nail disease that can be a sign of hypochromic anaemia, especially iron-deficiency anaemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing. In the early stages, nails may be brittle and chip or break easily.
Koilonychia is associated with Plummer-Vinson syndrome and iron deficiency anaemia. It has also been associated with lichen planus, syphilis, and rheumatic fever. The condition has been linked to iron deficiency in case reports, but it is more likely to be seen as an occupational change in nails and may be idiopathic. Ruling out iron deficiency anaemia in these patients is the only work-up necessary in this condition.
Other causes of koilonychia include high altitude, trauma, and exposure to petroleum products, and it can even be hereditary. Spoon-shaped nails should prompt an evaluation for possible iron deficiency and the underlying cause. If you have koilonychia, it is recommended that you don't bite your nails, don't pick at them, and make sure that your shoes fit. Keep your feet clean and dry if your toenails are affected, and don't use nail polish until your nails have returned to normal. Wear gloves to protect your hands when working with chemicals or washing dishes, and eat a nutritious diet.
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Koilonychia has also been associated with lichen planus, syphilis, and rheumatic fever
Koilonychia, also known as spoon nails, is a nail disease that can be a sign of hypochromic anaemia, especially iron-deficiency anaemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape. In a sense, koilonychia is the opposite of nail clubbing. In early stages, nails may be brittle and chip or break easily. Koilonychia has also been associated with lichen planus, syphilis, and rheumatic fever.
Koilonychia is primarily recognised as a manifestation of chronic iron deficiency, which may result from a variety of causes, such as malnutrition, gastrointestinal blood loss, worms, gastrointestinal malignancy, and celiac disease. Other causes of koilonychia are high altitude, trauma, and exposure to petroleum products, and it can even be hereditary.
If you have koilonychia, it is recommended that you don't bite your nails or pick at them. Make sure that your shoes fit, and keep your feet clean and dry if your toenails are affected. Don't use nail polish until your nails have returned to normal. Wear gloves to protect your hands when working with chemicals or washing dishes. Eat a nutritious diet.
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Frequently asked questions
It could be a condition called koilonychia, also known as spoon nails.
It is a nail disease or abnormality where the nails become thin, flat or concave in shape, and may have raised ridges.
It is associated with iron-deficiency anaemia, but can also be caused by high altitude, trauma, exposure to petroleum products, or hereditary factors.
Your nails may be brittle and chip or break easily. In more severe cases, your nails may curve enough to hold a drop of liquid.
You should consult a medical professional and consider ruling out iron deficiency anaemia as a possible cause.










































