
Beau's lines are horizontal indentations or ridges that can appear on one or more fingernails or toenails. They are named after French physician Joseph Honoré Simon Beau, who first discovered the condition. Beau's lines are caused by an interruption in nail growth, often due to illness, injury, or other underlying factors. They can be triggered by various conditions, including chronic illnesses like diabetes and thyroid disease, as well as acute events such as heart attacks, infections, and dietary factors.
| Characteristics | Values |
|---|---|
| Name | Beau's lines |
| Appearance | Horizontal indentations or ridges across fingernails or toenails |
| Colour | Sometimes a yellowish tint |
| Causes | Illness, injury, or other underlying factors, including chronic conditions like diabetes and thyroid disease, as well as acute events like heart attacks |
| Treatment | Treating the underlying cause will allow new, smooth nails to grow again |
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What You'll Learn
- Beau's lines are horizontal indentations or ridges across fingernails or toenails
- Beau's lines can be triggered by any event that disrupts nail growth, such as illnesses and infections
- Beau's lines have been linked to chronic conditions like diabetes and thyroid disease
- Beau's lines can also be caused by acute events like heart attacks, medications, and dietary factors
- Nail pitting and spoon nails are other causes of nail denting

Beau's lines are horizontal indentations or ridges across fingernails or toenails
Beau's lines indicate an interruption in nail growth, often due to illness, injury, or other underlying factors. The width of the line may provide clues about the cause. While the exact reasons for Beau's lines aren't fully understood, they have been linked to chronic conditions like diabetes and thyroid disease, as well as acute events like heart attacks. Medications, including chemotherapy, and dietary factors may also play a role.
Dents, ridges, and holes in the nails can occur due to an issue with how the layers in the superficial nail plate develop. This can be caused by dermatologic conditions and autoimmune diseases that cause skin cell overgrowth and buildup. Treating the underlying cause of Beau's lines will allow new, smooth nails to grow again. If you notice Beau's lines, it is recommended to consult a healthcare provider to identify the cause and determine the best course of action.
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Beau's lines can be triggered by any event that disrupts nail growth, such as illnesses and infections
Beau's lines are horizontal indentations or ridges across fingernails or toenails, sometimes with a yellowish tint. They indicate an interruption in nail growth, often due to illness, injury, or other underlying factors. The width of the line may provide clues about the cause. While the exact reasons for Beau's lines aren’t fully understood, they have been linked to chronic conditions like diabetes and thyroid disease, as well as acute events like heart attacks. Beau's lines can also be triggered by medications, including chemotherapy, and dietary factors.
Illnesses and infections that can cause Beau's lines include COVID-19, strep throat, and pneumonia. Dermatologic conditions and autoimmune diseases that cause skin cell overgrowth and buildup can also lead to Beau's lines. In addition, Beau's lines can be caused by an issue with how the layers in the superficial nail plate develop.
If you notice Beau's lines, it is important to consult a healthcare provider to identify the underlying cause and determine the best course of action. Treating the underlying cause will allow new, smooth nails to grow again.
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Beau's lines have been linked to chronic conditions like diabetes and thyroid disease
Beau's lines are horizontal indentations or ridges across fingernails or toenails, sometimes with a yellowish tint. They indicate an interruption in nail growth, often due to illness, injury, or other underlying factors. The width of the line may provide clues about the cause. While the exact reasons for Beau's lines aren't fully understood, they have been linked to chronic conditions like diabetes and thyroid disease, as well as acute events like heart attacks. Medications, including chemotherapy, and dietary factors may also play a role.
Beau's lines can be triggered by any event that disrupts the nail growth. This can include illnesses and infections such as COVID-19, strep throat, and pneumonia. Dermatologic conditions and autoimmune diseases that cause skin cell overgrowth and buildup can also cause Beau's lines.
If you notice Beau's lines, it is important to consult a healthcare provider to identify the underlying cause and determine the best course of action. Treating the underlying cause will allow new, smooth nails to grow again.
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Beau's lines can also be caused by acute events like heart attacks, medications, and dietary factors
Beau's lines are horizontal indentations or ridges across fingernails or toenails, sometimes with a yellowish tint. They indicate an interruption in nail growth, often due to illness, injury, or other underlying factors. The width of the line may provide clues about the cause. While the exact reasons for Beau's lines aren't fully understood, they have been linked to acute events like heart attacks, medications, and dietary factors. They have also been associated with chronic conditions like diabetes and thyroid disease. If you notice Beau's lines, it is recommended to consult a healthcare provider to identify the cause and determine the best course of action.
Beau's lines can be triggered by any event that disrupts nail growth. These can include illnesses and infections such as COVID-19, strep throat, and pneumonia. They can also be caused by injuries or skin conditions that affect nail growth. The nail matrix, the part of the nail that produces new cells, slows down or stops working due to these underlying factors.
Medications, including chemotherapy, have been linked to the development of Beau's lines. Dietary factors may also play a role, although the exact mechanisms are not yet fully understood. It is important to note that Beau's lines are not always a cause for concern and can sometimes be a normal variation in nail growth. However, if you notice any changes in your nails or have any concerns, it is always best to consult a healthcare professional for proper diagnosis and treatment.
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Nail pitting and spoon nails are other causes of nail denting
Nail pitting and spoon nails can be treated and prevented through proper nail care. For nail pitting, it is important to keep nails clean and dry, avoid biting or picking at the nails, and use a moisturiser to help keep the nails and cuticles healthy. For spoon nails, it is recommended to eat iron-rich foods, take iron supplements, and avoid exposure to harsh chemicals or water.
In some cases, nail pitting and spoon nails may be a sign of an underlying health condition. If you notice persistent or severe nail pitting or spoon nails, it is recommended to consult a healthcare professional for further evaluation and treatment.
Additionally, maintaining overall nail health can help prevent and manage nail denting. This includes practising good nail hygiene, such as keeping nails clean and trimmed, avoiding harsh nail treatments, and moisturising the nails and cuticles regularly. Protecting the nails from trauma and injury is also important, as well as managing any underlying health conditions that may be contributing to nail changes.
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Frequently asked questions
Beau's lines are horizontal indentations or ridges across fingernails or toenails, sometimes with a yellowish tint. They indicate an interruption in nail growth, often due to illness, injury, or other underlying factors.
Beau's lines can be triggered by any event that disrupts nail growth. These can include illnesses and infections such as COVID-19, strep throat, and pneumonia. They have also been linked to chronic conditions like diabetes and thyroid disease, as well as acute events like heart attacks.
Treating the underlying cause will allow new, smooth nails to grow again. If you notice Beau's lines, consult a healthcare provider to identify the cause and determine the best course of action.
Beau's lines can appear as moat-like depressions or dents on one or more nails. They run horizontally across the nail plate and can affect all fingernails or just a few. They can also affect one or more toenails, most often on the big toe.










































