Liam Carter
Discoloured nails can be a warning sign of diseases, infections, anaemia, and even poisoning. While some discolouration is harmless, it can also be a sign of serious health issues. Melanonychia, for example, is the term for dark pigmentation of the nails, which can be a natural occurrence in people with dark skin, but can also indicate health issues. Terry nails, on the other hand, are a common part of the ageing process.
| Characteristics | Values |
|---|---|
| Discolouration | Black, brown, greenish-black, yellow, yellow-green, white/pale, red, blue |
| Cause | Fungal infection, nail injuries, birth deformities, psoriasis, lichen planus, tumours, drugs, infections, diseases, ageing, melanoma, poor circulation, lung disease |
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What You'll Learn
Dark pigmentation (melanonychia)
Discoloured nails can be caused by a variety of factors, including health issues, infections, drugs, diseases, and even poisoning. Dark pigmentation (melanonychia) is a term used to describe the darkening of the nails, which can appear as a single dark band or streak, or it can involve the entire nail. Melanonychia can be a natural occurrence in people with dark skin, but it can also indicate health issues. The nail plate is usually semi-transparent due to a lack of melanin, the substance responsible for skin pigmentation. However, in certain circumstances, melanin can cause nail discolouration, resulting in melanonychia. The discolouration can occur in one or more nails and may appear as a single dark band or streak, or it can affect the entire nail. While melanonychia can be a natural occurrence in people with dark skin, it can also indicate health issues. Therefore, it is important to consult a doctor or dermatologist for an accurate diagnosis.
There are several possible causes of melanonychia. One cause could be nail injuries, which can lead to discolouration and dystrophies of the nails. Additionally, birth deformities of the nails, psoriasis, lichen planus, and occasionally tumours (both cancerous and non-cancerous) can contribute to nail discolouration. Furthermore, drugs, infections, and diseases can also be responsible for melanonychia. For example, an infection with Pseudomonas bacteria can result in a greenish discolouration, known as Green Nail Syndrome.
It is important to note that dark streaks on the nails could be a sign of melanoma. Therefore, if you notice any dark streaks or bands on your nails, it is advisable to consult a dermatologist as soon as possible. Early diagnosis and treatment of melanoma are crucial and can improve the chances of successful treatment.
In addition to melanonychia, other nail discolourations can indicate various health issues. For instance, thick, slow-growing, and yellow nails can be a sign of lung diseases such as emphysema or chronic bronchitis. Yellow nail syndrome can also be caused by fluid in the lungs and hands, as well as Raynaud's phenomenon, which is associated with poor circulation to the fingers, toes, and nose.
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Fungal infection (onychomycosis)
Discoloured nails can be caused by a variety of factors, including infections, skin disorders, and chemicals. One of the most common causes of nail discolouration is a fungal infection known as onychomycosis. This infection is caused by common fungi present in the air, dirt, and dust, and it accounts for about 50% of nail dystrophies.
Onychomycosis typically results in nail discolouration, with the nails appearing yellow, green, or black. The infection can also cause the nails to become thicker and slower-growing than usual. In some cases, the nail plate may separate from the nail bed, a condition known as onycholysis. This separation can further expose the nail to infection and trauma.
If you notice discolouration or other changes in your nails, it is important to consult a doctor or dermatologist. They can examine your nails and determine the underlying cause. In some cases, nail discolouration may be a warning sign of a more serious condition, such as melanoma, anemia, or poisoning.
To prevent fungal nail infections, it is important to maintain good nail hygiene and avoid long-term use of nail polish, as this can create a favourable environment for fungi to thrive. Additionally, be mindful of potential sources of infection, such as walking barefoot in public areas or sharing nail tools with others.
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Yellow nail syndrome
Discoloured nails can be a warning sign of diseases, infections, anaemia or poisoning. Yellow nails, in particular, can be a sign of lung diseases such as emphysema or chronic bronchitis. This is known as yellow nail syndrome. Nails affected by this syndrome become thick, overcurved, and yellow or yellow-green in colour. Fluid in the lungs and hands can also lead to yellow nail syndrome, as can Raynaud's phenomenon, which is caused by poor circulation to the fingers, toes and nose.
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Green nail syndrome
Discoloured nails can be caused by a number of factors, including fungal infections, nail injuries, birth deformities, psoriasis, lichen planus, and occasionally tumours. They can also be a sign of lung disease, poor circulation, or even poisoning.
Yellow nail syndrome is characterised by thick, overcurved, and yellow or yellow-green nails. It is often accompanied by lymphedema, an accumulation of lymphatic fluid in the tissues. This syndrome can also be caused by poor circulation to the fingers, toes, and nose, known as Raynaud's phenomenon.
If you notice any discolouration of your nails, it is important to consult a doctor or dermatologist, as it could be a sign of an underlying health condition. An accurate diagnosis is vital to determine the cause and receive appropriate treatment.
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Dark streaks (melanoma)
Discoloured nails can be caused by a variety of factors, some harmless and some more serious. Dark streaks on a fingernail or toenail could indicate melanoma, a type of skin cancer. Melanoma is a potentially dangerous form of skin cancer that can develop if unrepaired DNA damage to skin cells (most often caused by ultraviolet radiation from sunlight or tanning beds) triggers genetic mutations, or if such mutations are inherited. It is important to note that melanoma is not the only potential cause of dark streaks on nails, and that an accurate diagnosis is vital.
If you notice any dark streaks on your nails, it is recommended that you consult a dermatologist as soon as possible. Melanoma is easier to treat when diagnosed early, so prompt action is advisable. The dermatologist will be able to examine your nails and determine the underlying cause of the discolouration. They may also recommend further tests or treatments, depending on the specific circumstances.
In some cases, dark streaks on nails may be a natural occurrence, particularly in individuals with dark skin. Melanin, the substance responsible for skin pigmentation, can sometimes cause nail discolouration, resulting in a condition known as melanonychia. This condition can present as a single dark band or streak, or it may involve the entire nail. It is important to be aware of any changes in your nails and to seek medical advice if you have any concerns.
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Frequently asked questions
Yellow nails are often a sign of lung diseases like emphysema or chronic bronchitis. They can also be caused by fluid in the lungs and hands, or Raynaud's phenomenon, which is caused by poor circulation to the fingers, toes, and nose.
Green nails are often caused by an infection with Pseudomonas bacteria, known as Green Nail Syndrome.
White or pale nails can be a warning sign of diseases, infections, anemia, or even poisoning.
Red nails can be a warning sign of diseases, infections, anemia, or even poisoning.
Black or brown nails can be a natural occurrence in people with dark skin, but they can also indicate health issues.
