Caleb Foster
Black lines on nails, known as melanonychia, can be a normal colour variation, especially in people with darker skin tones. However, they can also be caused by injuries, medications, infections, skin conditions, endocrine disorders, and even skin cancer. Melanonychia can appear as a vertical or horizontal band of colour, ranging from light brown to deep black. If you notice any changes to your nails, it is important to consult a healthcare professional.
| Characteristics | Values |
|---|---|
| Colour | Black or brown |
| Band | Vertical or horizontal |
| Appearance | Gradual or rapid |
| Thickness | Thin or broad |
| Cause | Melanonychia, splinter haemorrhage, Beau lines, subungual melanoma, medication or medical treatment |
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What You'll Learn
Melanonychia
The underlying cause of melanonychia can vary, and you might notice other symptoms in addition to a black line on the nail. These symptoms might include black or brown discoloration of the nail, ranging from light brown to deep black, a vertical or horizontal band of colour, or a complete darkening of the nail plate. A black line that appears gradually or expands rapidly may signal a more serious issue. Other possible symptoms include splinter haemorrhages, which look like a wood splinter under your nail.
Some medications and medical treatments can cause black lines on the nails, and these lines are typically horizontal, running across the nail's width. The discoloration usually appears 3-8 weeks after starting treatment and typically fades within eight weeks after stopping or switching medications. Specific tests and therapies can also cause melanonychia, including X-rays on your hands and feet, phototherapy, and light therapy.
Brown-black nail lines may represent blood from trauma, bacterial, fungal, or viral infection, drug reaction, endocrine disorders, exogenous pigmentation, excess melanin production within the nail matrix, nevi, or melanoma. A basic understanding of nail anatomy and the recognition of several basic types of nail lines and bands allow clinicians to properly diagnose and treat nail diseases, recognize possible underlying systemic diseases, and know when to refer patients to a dermatologist for specialized evaluation and biopsy.
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Splinter haemorrhages
A black line on your nail is medically known as melanonychia, which causes a streak of dark pigmentation that runs along the nail bed. This can be a normal colour variation, especially in people with darker skin tones. However, it can also be caused by injuries, certain medications, infections, skin conditions, and endocrine disorders like Addison's disease or hyperthyroidism. Melanonychia can sometimes be a sign of melanoma (skin cancer).
If the black line on your nail is vertical, it may be a splinter haemorrhage. As the name suggests, splinter haemorrhages look like a wood splinter under your nail. They can be caused by trauma or injury to the nail bed. Splinter haemorrhages are usually harmless, but they can sometimes be a sign of a more serious health condition. If you notice changes in your nails, especially without an obvious cause, it is important to see a healthcare provider for a proper diagnosis and treatment.
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Trauma
Black lines on nails can be the result of many conditions. A small black line that forms vertically underneath the nail may be a splinter haemorrhage, while horizontal lines may be melanonychia. Melanonychia occurs due to increased melanin deposits in the nail or changes in the nail pigmentation. It typically appears as a vertical streak running from the cuticle to the tip of the nail. The colour can vary from dark brown to grey or black, and the thickness can range from resembling a thin pencil mark to a broader, more noticeable band.
Although black lines on nails are not usually a cause for concern, it is still recommended that you see a healthcare provider whenever you notice changes to your nails' colour, shape, or texture. This is especially true if the changes occur suddenly, as this may signal a more serious issue. Gradual changes are often more harmless than rapid ones, but a black line on your nail with no clear reason should still be checked.
Thicker lines that create a horizontal stripe on the nail are called Beau lines. These are usually not harmful, but nail discolouration in the nail bed can be a symptom of a type of cancer called subungual melanoma. Melanonychia can also be caused by certain medications and medical treatments, which typically appear 3-8 weeks after starting treatment and fade within eight weeks of stopping or switching medications. Specific tests and therapies can also cause melanonychia, including X-rays on your hands and feet or undergoing phototherapy or light therapy.
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Infections
Black lines on nails can be caused by a number of conditions, some of which are harmless and some of which are more serious. Infections are one potential cause of black lines on nails.
A small black line that forms vertically underneath the nail may be a splinter haemorrhage, which is caused by bleeding under the nail. This can be the result of an injury, such as a crushed finger, or an infection. If the black line is horizontal, it may be a sign of melanonychia, which is caused by increased melanin deposits in the nail or changes in nail pigmentation. Melanonychia can be harmless, but it can also be a symptom of a type of skin cancer called subungual melanoma, so it is important to see a healthcare provider if you notice any changes in your nails.
Other potential causes of black lines on nails include medications and medical treatments, such as X-rays on the hands and feet, phototherapy, and light therapy. These lines are usually horizontal and appear 3-8 weeks after starting treatment, fading within 8 weeks of stopping or switching medications.
It is important to note that gradual changes in nail colour are often more harmless than sudden changes, but any black line on the nail with no clear reason should be checked by a healthcare provider. Dermatologists are doctors with special training in diagnosing and treating conditions affecting the nails, skin, and hair, and can examine your nails to determine the cause of any discolouration.
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Endocrine disorders
Black lines on nails can be caused by a variety of factors, some of which may be indicative of underlying health issues, including endocrine disorders. While not all black lines on nails are cause for concern, it is always recommended to consult a healthcare professional for proper diagnosis and treatment.
One possible cause of black lines on nails is melanonychia, which is characterised by increased melanin deposits in the nail or changes in nail pigmentation. This condition can result in vertical or horizontal black lines, ranging from light brown to deep black in colour. Melanonychia is typically harmless, but in rare cases, it may be associated with subungual melanoma, a type of skin cancer that affects the melanocytes. Endocrine disorders, such as Addison's disease or Cushing's syndrome, can also lead to changes in nail pigmentation and the appearance of black lines. These disorders affect the body's hormone production and regulation, which can impact nail health.
Another potential cause of black lines on nails is splinter haemorrhages, which appear as small, vertical black lines underneath the nail. These lines may resemble a wood splinter and can be a sign of underlying bleeding in the nail bed. While splinter haemorrhages are often harmless, they can also be indicative of more serious health conditions, including endocrine disorders such as diabetes or thyroid issues. Diabetes, for example, can cause microvascular changes and increased bleeding tendencies, leading to splinter haemorrhages.
Additionally, certain medications and medical treatments can contribute to the development of black lines on nails. Endocrine disorders often require specific medications to manage hormone levels, and these drugs may have side effects that impact nail health. For example, certain endocrine-disrupting chemicals or medications can interfere with thyroid function, leading to changes in nail pigmentation and the formation of black lines.
Furthermore, Beau lines, which are thicker horizontal stripes on the nail, can be indicative of nail trauma or underlying health issues. While Beau lines are usually not harmful, they can be associated with endocrine disorders that impact nail growth and development. For instance, conditions such as hypothyroidism or hyperthyroidism can affect the body's metabolism and nutrient absorption, leading to changes in nail health and the appearance of Beau lines.
In summary, black lines on nails can be indicative of various health issues, including endocrine disorders. While some causes, such as melanonychia or splinter haemorrhages, may be relatively harmless, it is crucial to consult a healthcare professional for proper diagnosis and treatment. Endocrine disorders can impact nail health in multiple ways, and early detection and management of these disorders can help prevent further complications.
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Frequently asked questions
Light black lines on nails can be caused by splinter haemorrhages, which are typically harmless but can be a sign of a more serious health condition.
Splinter haemorrhages are small black lines that form vertically underneath the nail. They are called splinter haemorrhages because they look like a wood splinter under the nail.
Melanonychia, which is caused by increased melanin deposits in the nail or changes in nail pigmentation. Melanonychia can be harmless or a sign of a type of cancer called subungual melanoma.
If you notice changes in your nails, especially without an obvious cause, it's a good idea to see a healthcare provider. A dermatologist will be able to examine your nails, figure out what's causing the light black lines, and offer treatment options.
Yes, some medications and medical treatments can cause black lines on the nails. These lines are horizontal and typically appear 3-8 weeks after starting treatment, fading within eight weeks after stopping or switching medications.
