Noah Sinclair
The colour of your fingernails can be an indicator of your overall health. Healthy fingernails are typically a pinkish hue with white tips and a subtle shine. Any significant deviation from this colour, such as yellow, green, blue, or black, could indicate an underlying health issue. For example, yellow nails can suggest a fungal infection, and white nails can be a sign of low blood protein levels or, in rare cases, kidney failure. Changes in nail colour can also be harmless and due to mechanical or environmental influences, such as wearing red nail polish without a base coat. Therefore, while nail colour can provide clues about your health, it is essential to consult a healthcare professional if you have any concerns.
| Characteristics | Values |
|---|---|
| Healthy colour | Flesh-coloured, pinkish hue, or white |
| White nails | Kidney or liver disorders, anaemia, low levels of blood protein, or vitiligo |
| Yellow nails | Fungal infection, psoriasis, diabetes, lymphatic issues, respiratory issues, tobacco use, or liver anomalies |
| Green nails | Pseudomonas bacterial infection, candida (thrush infection), or bacterial infection |
| Blue nails | Poor circulation, respiratory issues, inadequate oxygenation of the blood, or cyanosis |
| Purple nails | Haematoma-blood clot |
| Dark patches | Melanoma or trauma |
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What You'll Learn
- Yellow nails: May indicate a fungal nail infection, or problems with the lymphatic system, liver, or lungs
- Green nails: Could be a sign of a bacterial infection, or candida (thrush)
- White nails: May indicate low blood protein, or in rare cases, kidney failure
- Blue nails: Can suggest poor circulation or respiratory issues, or be a side-effect of antibiotics
- Purple nails: Can indicate a blood clot under the nail
Yellow nails: May indicate a fungal nail infection, or problems with the lymphatic system, liver, or lungs
Yellow nails can indicate a fungal nail infection, or problems with the lymphatic system, liver, or lungs. Nails are made of a protein called keratin, and changes in their colour, shape, or texture can be a sign of an underlying health condition.
Yellow nails can be a sign of a fungal nail infection, which causes nails to crack, peel, and change colour and texture. This is the most common cause of yellow nails. Toenail fungus, or onychomycosis, is very common, affecting 1 in 10 people overall and 1 in 2 people over 70. It occurs when fungi get between the toenail and the nail bed, and it thrives in warm, moist, dark places.
Yellow nails can also be indicative of problems with the lymphatic system, liver, or lungs. In rare cases, "yellow nail syndrome" occurs in patients with serious lung disease and swelling of the extremities (lymphedema). The lymphatic system helps the body balance fluids, fight infection, and absorb nutrients, and yellow nails can be a sign of "lymphatic impairment" or leakage. In addition, white nails can indicate liver disorders, so yellow nails may also be indicative of liver problems.
Other potential causes of yellow nails include tobacco use, as smoking can turn nails yellow. In addition, yellow nails can be caused by certain drugs used to treat rheumatoid arthritis, although this has not been proven. Titanium exposure is another possible cause, as titanium can be found in many everyday items, including sunscreen, cosmetics, and medicines.
If you notice yellow nails, it is important to consult a healthcare professional to determine the underlying cause and receive proper treatment.
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Green nails: Could be a sign of a bacterial infection, or candida (thrush)
Healthy fingernails are typically flesh-coloured with white tips and a subtle shine to the cuticles. Any significant deviation from this colour, such as green nails, could indicate an underlying health issue. Green nails are most commonly associated with bacterial infections, specifically the bacterium Pseudomonas aeruginosa, which causes Green Nail Syndrome (GNS). This bacterium is found in soil and water sources and thrives in moist, warm environments, so it often enters the body through macerated toe webs. It can also be transferred to others through skin-to-skin contact or self-inoculation, such as accidentally scratching oneself with an infected nail.
The bacterium produces a variety of pigments, including the well-known blue-green pigment pyocyanin, which causes the green discolouration of the nail. This discolouration can be green to dark green, appearing nearly black. In addition to the colour change, the infection can cause the nail to thicken and crumble, and the nail bed may retract if left untreated.
While less common, green nails can also be a sign of a fungal infection, specifically one caused by the fungus Candida parapsilosis, which has been associated with Green Nail Syndrome. This fungus is an opportunistic pathogen, often affecting immunocompromised individuals or those with onycholysis. The nail plate discolouration caused by Candida parapsilosis can be diffusely green or black or appear as a linear streak of black, green, white, or yellow.
If you notice green nails, it is important to seek medical advice as bacterial and fungal infections usually require different treatments. A culture of the nail plate can be performed to determine the underlying cause of the discolouration and guide treatment.
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White nails: May indicate low blood protein, or in rare cases, kidney failure
The human body can reveal a lot about a person's health, and fingernails are no exception. Healthy fingernails are generally pink, with a white hue at the tips, and a subtle shine on the cuticles. Any significant deviation from this colour could indicate an underlying health issue. For example, white fingernails, also known as Muehrcke's nails, may indicate low blood protein or, in rare cases, kidney failure.
Muehrcke's nails are characterised by white streaks or lines that run parallel to the knuckles of the fingernail. These white streaks form when there is insufficient blood flow to the nail bed. While a white streak here and there is not necessarily a cause for concern, multiple white spots on several nails may warrant a visit to your doctor.
Low blood protein can be a result of malnutrition, as those with kidney disease may experience. In such cases, dietary restrictions and a loss of appetite for certain foods can lead to a deficiency in protein, which is essential for nail health. Keratin, the protein that makes up nails, can be affected by dietary changes.
In addition to kidney disease, white nails can also indicate liver disorders or anaemia. It is important to note that nail colour changes are rarely the first sign of a serious illness, and other symptoms usually manifest beforehand. Nonetheless, if you notice persistent or unusual white spots on your nails, it is always a good idea to consult a doctor or healthcare professional to rule out any potential underlying health issues.
While this can be a helpful guide, it is important to remember that nail colour can be influenced by various factors, including environmental influences, staining from nail polish, and mechanical factors. Additionally, nail colour changes may be temporary and resolve over time.
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Blue nails: Can suggest poor circulation or respiratory issues, or be a side-effect of antibiotics
Healthy fingernails are generally pink, with a white nail plate and a pinkish hue. However, when fingernails turn blue, it can be a sign of poor circulation or respiratory issues, or it could be a side effect of antibiotics.
Poor Circulation
Poor circulation can be a cause of blue nails. When the body isn't getting enough oxygen, it can lead to a condition called cyanosis, which turns the skin or membrane below the skin a purplish-blue colour. This can be due to various factors, including heart and lung diseases, problems with hemoglobin, or exposure to cold temperatures. In the case of cold temperatures, warming the hands can help return the nails to their normal colour.
Respiratory Issues
Respiratory issues can also cause blue nails. Certain lung conditions can result in a lower-than-typical level of oxygen in the blood, known as hypoxemia. These conditions include pulmonary embolism, pneumonia, asthma, and chronic obstructive pulmonary disease (COPD). Acute respiratory distress syndrome (ARDS) can also lead to blue nails due to the difficulty in breathing and the resulting drop in blood oxygen levels.
Side-Effect of Antibiotics
In some cases, blue nails can be a side effect of antibiotics. Tetracycline antibiotics can cause a blue tint on the nails. Additionally, exposure to certain chemicals or medicines can lead to methemoglobinemia, a condition that affects the ability of hemoglobin to release oxygen.
It is important to note that while nail colour can provide clues about overall health, it is rarely the first sign of a serious illness. Other symptoms usually manifest before nail changes become evident. If you notice blue nails, it is advisable to seek medical advice to rule out any underlying health conditions.
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Purple nails: Can indicate a blood clot under the nail
The colour of your nails can often indicate something about your health. While healthy fingernails are generally pink, with a white nail bed, any significant deviation from this normal pinkish hue can indicate an underlying health issue.
Purple nails, specifically, can indicate a blood clot under the nail, known as a subungual hematoma. This occurs when blood pools under your nail plate, causing discolouration. A subungual hematoma is usually the result of direct trauma to the nail, such as dropping a heavy object on your toe or finger. In addition to discolouration, symptoms of a subungual hematoma include severe or throbbing pain.
If you notice discolouration and suspect a subungual hematoma, it is important to seek medical care, especially if you are experiencing worsening pain. A healthcare provider can perform a simple drainage procedure to relieve pressure and reduce pain. However, do not attempt to drain the hematoma at home. In some cases, additional damage, such as a broken bone or deep cut, may require further treatment and a longer recovery time.
It is worth noting that nail discolouration may be caused by factors unrelated to your health, such as mechanical or environmental influences. For instance, the use of certain medications or exposure to certain substances can lead to nail discolouration. Nonetheless, if you observe any changes in the colour of your nails, it is always a good idea to consult a healthcare professional to rule out any potential underlying health issues.
Frequently asked questions
Healthy fingernails are typically light pink or purple with white tips and a subtle shine. They should have a smooth, round surface and consistent gentle curves.
White fingernails, also known as leukonychia, can indicate several conditions, including anaemia, liver disease, heart disease, kidney disease, or even poisoning.
Yellow nails are commonly caused by a fungal infection or a reaction to products like nail polish. In rare cases, they may indicate a more serious underlying issue.
Bluish nails suggest poor circulation or respiratory issues.
Yes, changes in nail colour and texture can indicate vitamin and mineral deficiencies. For example, vitamin B12, iron, zinc, or magnesium deficiencies can cause vertical ridges on the nail beds.
