Noah Sinclair
Dark lines on the nails, known as melanonychia, can be caused by a number of factors, including trauma, vitamin deficiencies, and cancer. Melanonychia can appear as a brown or black stripe that runs from the bottom of the nail bed to the top, and can occur on one or several nails. While it may be a natural variation in people with darker skin tones, it can also be a sign of a more serious condition, such as melanoma or endocarditis.
| Characteristics | Values |
|---|---|
| Name | Melanonychia |
| Appearance | Brown or black lines that begin at the bottom of the nail bed and continue to the top |
| Causes | Melanonychia can be caused by a number of factors, including: vitamin B12, vitamin D, and protein deficiencies; trauma or injury; skin conditions; endocrine disorders; and cancer |
| Treatment | If melanonychia is malignant or cancerous, the tumour or cancerous area must be removed, which may result in the loss of all or part of the nail |
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Melanonychia
Having a dark line on your fingernails or toenails 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. Melanonychia can develop due to many causes, including nail cancer, trauma, and other health conditions. Deficiencies in vitamin B12, vitamin D, and protein can cause dark lines in nails. Other causes can include cancer, too much iron, and other health conditions. A dark vertical line on the nail can indicate nail melanoma.
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Causes of melanonychia
Having a dark line on your fingernail or toenail 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. Melanonychia can develop due to many causes, including nail cancer, trauma, and other health conditions. Deficiencies in vitamin B12, vitamin D, and protein can cause dark lines in nails. Other causes can include too much iron, cancer, and other health conditions. A dark vertical line on the nail can indicate nail melanoma.
Melanonychia causes a streak of dark pigmentation that runs along the nail bed. It can be a normal colour variation, especially in people with darker skin tones. Melanonychia can sometimes be a sign of melanoma (skin cancer). Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture.
Injuries, certain medications, infections, skin conditions, and endocrine disorders like Addison's disease or hyperthyroidism can also cause a black line on one or more of your nails. When black lines appear on multiple nails, it tends to point to a systemic (body-wide) cause rather than an injury. For example, a black line on multiple nails can be a sign of endocarditis, a bacterial infection in the heart. Black lines on the nail occur with endocarditis due to damaged blood vessels.
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Melanonychia and melanoma
Having a dark line on your fingernail or toenail is called melanonychia. Melanonychia causes a streak of dark pigmentation that runs along the nail bed, usually from the bottom of the nail bed to the top. Melanonychia may appear in one nail or several. It can be a normal colour variation, especially in people with darker skin tones, but it can also be a sign of melanoma (skin cancer). Melanonychia can develop due to many causes, including nail trauma, endocrine disorders, vitamin deficiencies, and other health conditions. If your melanonychia is malignant or cancerous, the tumour or cancerous area must be removed, which may mean losing all or part of your nail. A doctor can perform exams to determine whether melanonychia is malignant.
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Endocarditis
A dark line on the nail is called melanonychia. It can be a normal colour variation, especially in people with darker skin tones, but it can also be caused by injuries, certain medications, infections, skin conditions, endocrine disorders, and even cancer. Melanonychia can sometimes be a sign of melanoma (skin cancer). Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture.
If you notice a dark line on your nail, it is important to see a doctor to determine the cause. A nail biopsy may be performed to check for cancer or other health conditions. If the melanonychia is malignant or cancerous, the tumour or cancerous area must be removed, which may result in the loss of all or part of the nail.
To prevent melanonychia, it is important to maintain a healthy diet and lifestyle. Deficiencies in vitamin B12, vitamin D, and protein can contribute to the development of dark lines in the nails. Additionally, managing stress and avoiding habits like nail-biting can help reduce the risk of trauma to the nails.
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Trauma
A dark line on the nail can be caused by trauma, such as a splinter haemorrhage, which occurs when the tiny blood vessels beneath the nail break and bleed. This can be caused by hitting the nail, prolonged pressure, or habits like nail biting.
Dark lines on the nail can also be caused by a number of other factors, including vitamin B12, vitamin D, and protein deficiencies, as well as certain medications, infections, skin conditions, and endocrine disorders like Addison's disease or hyperthyroidism. In some cases, a dark line on the nail can indicate nail melanoma or cancer.
It is important to see a healthcare provider if you notice any changes to your nails' colour, shape, or texture, as this can be a sign of an underlying health condition. A doctor can perform exams to determine whether the dark line is malignant or cancerous. If it is, the tumour or cancerous area must be removed, which may result in the loss of all or part of the nail.
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Frequently asked questions
A dark line in your nail is called melanonychia. It can be a normal colour variation, especially in people with darker skin tones. However, it can also be caused by injury, infection, or cancer.
When black lines appear on multiple nails, it tends to point to a systemic cause rather than an injury. It can be a sign of endocarditis, a bacterial infection in the heart.
Although a black line on your nails isn't usually a cause for concern, it's a good idea to see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture.
