Sophia Delgado
A brown line down your nails is called melanonychia, and it can be a sign of other health issues. Melanonychia is caused by an increase in the production of melanin in your nail. It can also be caused by malnutrition, or by pigments other than melanin getting into the nail fold. Melanonychia may appear in one nail or several, and it can occur naturally if you have a dark complexion. If you have a brown line on your nail, you should have it checked by a doctor.
| Characteristics | Values |
|---|---|
| Name | Melanonychia, also called melanonychia striata or longitudinal melanonychia |
| Description | A brown or black stripe that begins at the bottom of the nail bed and continues to the top |
| Causes | An increase in the production and deposits of melanin in the nail but not an increase in pigment cells; genetic disorders; malnutrition; certain medications; radiation therapy for cancer |
| Treatment | If persistent, affecting a large part of the nail, or associated with bleeding, have a doctor take a look |
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What You'll Learn
- Melanonychia: the medical name for black or brown lines on your nails
- Melanocytic activation: an increase in the production of melanin in your nail
- Melanonychia striata: a partial or complete stripe running length-wise along the nail
- Malnutrition: a brown line on your nails can be related to not having enough of certain nutrients in your diet
- Melanoma: a brown line on your nail can be a sign of skin cancer
Melanonychia: the medical name for black or brown lines on your nails
A brown line on your nail is related to how much melanin is being made in your body. Melanin is a pigment that colours your nails, hair and skin. The medical term for black or brown lines on your nails is melanonychia. The lines 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.
The condition can occur naturally if you have a dark complexion, but it can also be caused by certain medications and radiation therapy for cancer. Melanonychia can also develop when pigments other than melanin get into the nail fold.
In some cases, melanonychia may be a sign of other health issues. Malnutrition can cause changes to your skin and nails, and a brown line on your nails can be related to not having enough of certain nutrients in your diet, including vitamin B12 and folate. Melanonychia can also be associated with several rare genetic disorders in which skin hyperpigmentation is a common symptom.
If you have a brown line on your nail, it's important to have a doctor check for melanonychia. A darkened streak on the nail bed does not necessarily mean that you have a disease, but if it's persistent, affects a large part of a nail, or is associated with bleeding, it's important to be diagnosed early.
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Melanocytic activation: an increase in the production of melanin in your nail
A brown line down your nails is called melanonychia, and it can appear in one or several nails. It is usually a stripe that begins at the bottom of the nail bed and continues to the top. Melanonychia can occur naturally if you have a dark complexion, but it can also be a sign of other health issues. For example, it can be caused by malnutrition, specifically a lack of vitamin B12 and folate. Melanonychia can also be a symptom of several rare genetic disorders in which skin hyperpigmentation is a common symptom.
Melanonychia is caused by melanocytic activation, which is an increase in the production and deposits of melanin in the nail. Melanin is the pigment that colours your nails, hair and skin. Melanocytes are the cells that make melanin, and sometimes they make extra melanin, which can cause a brown line on your nail. This is known as longitudinal melanonychia, and it can be caused by certain medications and radiation therapy for cancer. If you notice a brown line on your nail that is persistent, affects a large part of the nail, or is associated with bleeding, you should see a doctor. Many of the more serious conditions that can cause melanonychia can be treated, but it's important to be diagnosed early.
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Melanonychia striata: a partial or complete stripe running length-wise along the nail
A brown line down your nails is called melanonychia, and it may appear in one nail or several. This condition is also called melanonychia striata or longitudinal melanonychia. It is caused by an increase in the production and deposits of melanin in your nail, but not an increase in pigment cells. Melanonychia striata can look like a partial or complete stripe running length-wise (longitudinal) along the nail.
The appearance of a brown line on your nails can be related to not having enough of certain nutrients in your diet, including vitamin B12 and folate. It can also be caused by several rare genetic disorders in which skin hyperpigmentation (excess pigmentation) is a common symptom. Genetic disorders occur because you have certain mutations in your genes. Many of these conditions are autosomal dominant, meaning that you only need to inherit the gene mutation from one parent to have the disease.
Transverse melanonychia is similar to longitudinal melanonychia, except the lines go side to side (transverse) across the nail instead of up and down (longitudinal). It is a rare type and is mostly associated with certain medications and radiation therapy for cancer.
A darkened streak on the nail bed does not necessarily mean that you have a disease, but if it’s persistent, affects a large part of a nail, or is associated with bleeding, you should consult a doctor. Many of the more serious conditions that can cause a brown line on your nail can be treated, but it’s important to be diagnosed early.
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Malnutrition: a brown line on your nails can be related to not having enough of certain nutrients in your diet
A brown line down your nails is called melanonychia, and it can be caused by an increase in the production and deposits of melanin in your nail. It can also be caused by malnutrition, specifically a lack of vitamin B12 and folate. Melanonychia may appear in one nail or several, and it can occur naturally if you have a dark complexion. It is important to get a diagnosis from a doctor, as it can be a sign of other health issues.
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Melanoma: a brown line on your nail can be a sign of skin cancer
A brown line down your nails is called melanonychia, and it can be a sign of skin cancer, also known as melanoma. Melanonychia is a stripe that begins at the bottom of the nail bed and continues to the top. It can appear in one nail or several. While it can occur naturally in people with a dark complexion, it can also be a symptom of melanoma, a rare genetic disorder, or malnutrition. Melanonychia can also develop when pigments other than melanin get into the nail fold.
If you notice a brown line on your nail, it is related to how much melanin is being made in your body. Melanin is a pigment made by melanocytes, which also colour your hair and skin. Melanonychia striata can look like a partial or complete stripe running lengthwise along the nail.
Transverse melanonychia is a rare type of melanonychia where the lines go side to side across the nail. It is mostly associated with certain medications and radiation therapy for cancer.
If you notice a brown line on your nail, it is important to get it checked by a doctor. While it does not necessarily mean that you have a disease, many of the more serious conditions that can cause a brown line on your nail can be treated if diagnosed early.
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Frequently asked questions
A brown line down your nails is called melanonychia. It can be caused by an increase in melanin production, but it can also be a sign of other health issues, including vitamin deficiencies, malnutrition, and in rare cases, cancer.
If you have a brown line on your nails, you should have it checked by a doctor, as it may be a sign of an underlying health issue. Your doctor may take a small sample of your nail and the tissue underneath to be checked in a lab.
Yes, many of the more serious conditions that can cause a brown line on your nails can be treated. However, it's important to be diagnosed early, so if you notice any changes to your nails, you should consult your doctor.
