
The shape, texture, and colour of your fingernails can tell you a lot about your health. If you notice that your fingernails are flat, it could be a sign of an iron deficiency or a condition called koilonychia. However, it's important to remember that not all nail abnormalities are cause for concern. In some cases, they may be a harmless trait that runs in the family.
| Characteristics | Values |
|---|---|
| Name of condition | Koilonychia |
| Shape | Flattened with concavities |
| Associated with | Iron deficiency |
| Other symptoms | Raised ridges, thin and curved inward |
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What You'll Learn
- Koilonychia: a condition where nails are flattened and have concavities, associated with iron deficiency
- Beau's lines: depressions across the fingernail that can occur after illness, injury, eczema, chemotherapy or poor nutrition
- Ridges: can be a sign of a current or past illness or nutrient deficiency
- Colour change: can be a warning sign of a specific disease
- Onycholysis: nails become loose and may detach from the nail bed

Koilonychia: a condition where nails are flattened and have concavities, associated with iron deficiency
Koilonychia is a condition where the nails are flattened and have concavities. It is an abnormal shape of the fingernail, where the nail has raised ridges and is thin and curved inward. This disorder is associated with iron deficiency anaemia.
Koilonychia is a type of nail abnormality. Nail abnormalities are problems with the colour, shape, texture, or thickness of the fingernails or toenails. They can be a sign of a current or past illness, or a nutrient deficiency. In some cases, nail abnormalities can be harmless traits that run in the family.
If you notice your nails are flattened and have concavities, it is important to see a board-certified dermatologist. They can help determine the underlying cause of the nail abnormality and recommend appropriate treatment.
Treatment for nail abnormalities depends on the underlying cause. In some cases, treating the underlying cause can help improve the appearance of the nails. For example, if the nail abnormality is caused by a nutrient deficiency, addressing the deficiency can help improve nail health.
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Beau's lines: depressions across the fingernail that can occur after illness, injury, eczema, chemotherapy or poor nutrition
Beau lines (also called Beau's lines) are depressions across the fingernail. These lines can occur after illness, injury to the nail, eczema around the nail, during chemotherapy for cancer, or when you do not get enough nutrition. They are often a result of ageing, but can also be due to certain diseases and conditions.
Beau lines are associated with flat nails, which are also known as koilonychia. This condition is characterised by flattened nails with concavities and is associated with iron deficiency. In some cases, brittle nails might also be a sign of iron deficiency.
Nail abnormalities are problems with the colour, shape, texture, or thickness of the fingernails or toenails. Beau lines are a type of nail abnormality, as are ridges in the nails. Ridges may run vertically or horizontally and can be a sign of a current or past illness or nutrient deficiency.
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Ridges: can be a sign of a current or past illness or nutrient deficiency
Koilonychia is a condition in which nails are flattened and have concavities. This condition may be associated with iron deficiency. Ridges in your fingernails or toenails can be a sign of a current or past illness or nutrient deficiency. Your healthcare provider can help you determine why you have ridges in your nails. Usually, your nails will become smoother if you treat the underlying cause. Ridges may run vertically (up and down) or horizontally (across) your nail.
Beau lines (also called Beau's lines) are depressions across the fingernail. These lines can occur after illness, injury to the nail, eczema around the nail, during chemotherapy for cancer, or when you do not get enough nutrition. Brittle nails are often a normal result of ageing. They can also be due to certain diseases and conditions, such as hypothyroidism or iron deficiency.
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Colour change: can be a warning sign of a specific disease
Fingernails can tell you a lot about your health. If your nails are flat, this could be a sign of koilonychia, which is associated with iron deficiency or iron deficiency anaemia.
Colour change in the nails can be a warning sign of a specific disease. For example, white streaks or spots on the nails, known as leukonychia, can be caused by drugs or disease. Ridges in the nails can also be a sign of a current or past illness, or a nutrient deficiency.
If you notice any colour changes in your nails, it is important to see a board-certified dermatologist. While colour changes can be a warning sign of a specific disease, they do not always mean that you have a disease.
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Onycholysis: nails become loose and may detach from the nail bed
Flattened nails are known as koilonychia, a condition that may be associated with iron deficiency or iron deficiency anaemia. In some cases, flattened nails can also be a sign of a current or past illness.
Onycholysis is a nail abnormality where the nails become loose and may even detach from the nail bed. This condition can be caused by a number of factors, including:
- Injury to the nail
- Eczema around the nail
- Chemotherapy for cancer
- Lack of proper nutrition
- Hypothyroidism
- Iron deficiency
If you notice any abnormalities in your nails, it is important to consult a healthcare professional for proper diagnosis and treatment.
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Frequently asked questions
Flat fingernails are a condition known as koilonychia, which is associated with iron deficiency anaemia.
Koilonychia is characterised by flattened nails with concavities. Nails may also have raised ridges and be thin and curved inward.
If you think you have koilonychia, you should see a doctor or dermatologist. They can help you determine the underlying cause and recommend appropriate treatment.











































