Caleb Foster
A line down your thumbnail could be a sign of a number of things. Vertical lines are often a sign of ageing, while horizontal lines can point to malnutrition, serious nail injury, or Beau's lines, which are caused by illness or severe stress. Beau's lines can also be caused by injury, and can be a sign that an illness or trauma has happened more than once. Melanonychia is another possibility, which is a dark line on your thumbnail that can be brown or black. This can occur naturally if you have a dark complexion, but it's always best to get it checked out by a doctor.
| Characteristics | Values |
|---|---|
| Type of line | Vertical or horizontal |
| Number of lines | Single or multiple |
| Thickness of lines | Thick or thin |
| Number of nails affected | One or more |
| Colour of line | Brown or black |
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Beau's lines
If you have Beau's lines, your healthcare provider or dermatologist may diagnose them by examining your nails and taking a health history. There isn't a treatment for Beau's lines.
Ridges in your nails are usually harmless but can mean different things. Vertical ridges are often a sign of ageing, while horizontal ridges can point to issues like malnutrition, serious nail injury, or Beau's lines.
If you have a dark line on your fingernails or toenails, this is called melanonychia. The lines are brown or black and usually look like a stripe that begins at the bottom of your nail bed and continues to the top. Melanonychia may appear in one nail or several. These lines can occur naturally if you have a dark complexion. No matter the cause, it's recommended that you have a doctor check for melanonychia because the lines may be a sign of other health issues.
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Vertical ridges
If you are concerned about vertical ridges on your nails, you can connect to a dermatologist in your area. Your healthcare provider or dermatologist may examine your nails and take a health history to determine the cause.
It is important to note that having a dark line on your fingernails or toenails, known as melanonychia, may be a sign of other health issues. Melanonychia is characterised by brown or black stripes that begin at the bottom of your nail bed and continue to the top. No matter the cause, it is recommended to have a doctor check for melanonychia.
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Horizontal ridges
A single Beau's line on one nail may indicate an injury that affected only one finger or toe. Beau's lines on all of your nails can mean that an illness or stress caused them. Multiple Beau's lines on each nail may mean that an illness or trauma happened more than once. Thicker Beau's lines may be a sign that an illness or trauma lasted a longer time. Beau's lines can also be a symptom of malnutrition or a serious nail injury.
If you experience other symptoms like texture changes in your nails, it may be caused by a medical condition. In trachyonychia (twenty-nail dystrophy), for example, the ridges are deep and run vertically from the tip of the fingernail down to the cuticle. These are sometimes called longitudinal striations or bands.
It's important to note that ridges in your nails are usually harmless, but they can sometimes indicate underlying health issues. If you have concerns about the appearance of your nails, it is recommended to consult a healthcare professional or dermatologist for a proper diagnosis.
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Melanonychia
A line down your thumbnail could be a sign of melanonychia. Melanonychia is a condition that causes brown or black lines to appear on your fingernails or toenails. The lines usually look like stripes that begin at the bottom of the nail bed and continue to the top. Melanonychia may appear in one nail or several, and can occur naturally if you have a dark complexion. However, no matter the cause, it is important to have a doctor check for melanonychia as the lines may be a sign of other health issues.
While melanonychia can occur naturally, it is important to be aware of other potential causes and health issues that may be indicated by the presence of these lines. For example, Beau's lines are deep horizontal ridges that can appear on the nails and are often a symptom of serious conditions or health issues. Beau's lines can be caused by illness, severe stress, injury to the nail matrix, or long-term health problems that interfere with blood flow to the nail matrix. The thickness and number of Beau's lines can provide clues about the cause, with a single line on one nail possibly indicating an injury to that finger or toe, and multiple lines on each nail suggesting that an illness or trauma occurred more than once.
If you notice any lines or ridges on your nails, it is always best to consult with a healthcare professional or dermatologist for a proper diagnosis and to rule out any underlying health issues.
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Trachyonychia
A line down your thumbnail could be a Beau's line, which is a horizontal ridge. Beau's lines can be caused by an injury, illness or severe stress. If you have a Beau's line, you should consult a healthcare professional.
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Frequently asked questions
It could be a Beau's line, which is a groove or dent that runs across your fingernails or toenails horizontally.
Beau's lines can be caused by an injury, illness or severe stress.
Beau's lines are horizontal ridges, as opposed to vertical ridges, which are a sign of ageing.
See a healthcare provider or dermatologist, who will be able to diagnose the cause by examining your nails and taking a health history.
No, there is no treatment for Beau's lines.
