Sophia Delgado
Yellow nails can be caused by various factors, ranging from harmless to severe health conditions. One common cause is the use of dark nail polish, especially without a base coat, which can stain the nails and lead to yellow discolouration. Regular smoking can also cause nails to turn yellow due to repeated exposure to tar in tobacco smoke. Additionally, underlying health issues such as lung disease, rheumatoid arthritis, thyroid problems, or fungal infections may contribute to yellow nails. In some cases, yellow nails could indicate a serious condition called yellow nail syndrome, characterised by thickened, yellow nails that lack a cuticle and grow slowly. Other signs of nail abnormalities include changes in texture, shape, or the presence of dark streaks, which may warrant a consultation with a dermatologist.
| Characteristics | Values |
|---|---|
| Cause | Nail polish, fungal infections, underlying disease, lung disease, rheumatoid arthritis, nail infection, melanoma, iron deficiency, thyroid problems, zinc deficiency, smoking, self-tanning products, tar, old age, chemotherapy medicines, antibiotics, arsenic poisoning, heart disease, renal failure, pneumonia, hypoalbuminemia |
| Symptoms | Yellow nails, thickening, slow growth, loss of cuticles, over-curved nails, inflammation, swelling, sponginess, dark streaks, white discoloration, pitted nails, ridges, grooves, clubbed appearance, spoon-shaped nails, rounded nails |
| Treatment | Stop using nail polish, see a board-certified dermatologist, treat underlying disease, stop smoking, avoid self-tanning products, chemotherapy, antibiotics |
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Yellow nail syndrome
While the cause of YNS is unknown, some experts believe that it results from issues with the circulatory or lymphatic system. When these systems do not work as they should, fluid can collect in the soft tissues under the skin, turning the nails yellow. This fluid collection can also lead to swelling in the arms and legs, known as peripheral lymphedema. Additionally, fluid accumulation in the membranes surrounding the lungs and lining the chest cavity can cause respiratory symptoms such as a chronic cough, shortness of breath, chest pain, and recurrent infections.
YNS primarily affects adults aged 50 and older, but it has also been documented in children. It is important to note that the onset of lymphedema may occur around puberty, and areas affected by lymphedema may feel heavy or tight, with decreased flexibility in the hands, feet, wrists, or ankles. The skin on areas with lymphedema may also become hardened or thickened.
Some researchers believe that YNS may have a genetic component, with a potential link to a mutation in the FOXC2 gene. This gene is associated with a similar disorder called lymphedema-distichiasis syndrome. Additionally, there may be a connection between YNS and titanium exposure, as joint replacements, dental implants, and certain medications can increase titanium exposure.
Diagnosing YNS requires the presence of two of the following: yellow nails, lymphedema, and pulmonary disease. It is important to differentiate YNS from other conditions with similar symptoms, such as psoriasis, fungal infections, or onychomycosis. Histopathological examination of nail samples can help rule out fungal infections, and a thorough history and examination of the pulmonary, vascular, and integumentary systems are crucial for diagnosis.
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Dark nail polish
There are several reasons why your nails may be discoloured. One of the most common reasons is the use of dark-coloured nail polishes. While not everyone experiences nail discolouration, dark-coloured nail polishes can cause nail staining due to a chemical reaction between the colourant and the nail plate. This reaction can take a few days to a few weeks to occur and is more likely to happen with darker polishes such as red, orange, blue, and black.
Formaldehyde, a common ingredient in nail polishes, could also be the culprit. Formaldehyde can react with the keratin protein in your nails, causing them to become brittle and yellow. This chemical is often found in nail hardeners and can make your nails prone to cracking. Additionally, some clear topcoats can also turn yellow over time, causing the nail polish underneath to appear yellowish.
To prevent nail discolouration, it is recommended to opt for lighter nail polish colours and always use a base coat before applying the colour polish. Removing your nail polish regularly and giving your nails a break in between polishes can also help. If you notice persistent discolouration, it may be a good idea to consult a doctor to rule out any other potential causes.
If your nails are already stained, you can try applying nail stain remover to lighten the stain. Soaking your nails in a vinegar solution or using whitening toothpaste may also help reduce the yellow appearance. However, it's important to note that these remedies may not completely remove the staining, and it may take some time for the discolouration to grow out.
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Lung disease
Yellow nails can be caused by various factors, ranging from harmless to more severe underlying conditions. One common cause of yellow nails is the regular use of dark-coloured nail polish, which can stain the nail plate and lead to yellow discolouration. This can be exacerbated by the use of acetone-based nail polish removers, which can cause the dissolved nail polish to bond more strongly to the nails. Additionally, self-tanning products containing DHA can accumulate around the cuticles, resulting in a dark yellow appearance.
In some cases, yellow nails can be indicative of underlying health issues. One such condition is lung disease, including chronic lung disease and COPD, commonly observed in long-term smokers. The repeated exposure to tar in tobacco smoke can cause yellow discolouration and a rounded or clubbed appearance of the nails. Additionally, lung disease can lead to nail thickening, slowing of nail growth, and loss of cuticles, characteristics of Yellow Nail Syndrome. This syndrome is also associated with lymphoedema, particularly around the ankles, and compromised respiration.
Another potential cause of yellow nails is a fungal infection, which requires medical attention. Certain diseases, such as rheumatoid arthritis, can also manifest as yellow nails. Furthermore, changes in nail colour can be indicative of more serious conditions, including heart disease, renal failure, pneumonia, hypoalbuminemia, and arsenic poisoning. Melanoma, the most serious type of skin cancer, can sometimes present as a dark streak down the length of the nail, known as subungual melanoma, warranting immediate medical evaluation.
While nail discolouration can be a harmless trait or a result of external factors, it is important to consult a board-certified dermatologist if you notice any persistent or concerning changes in your nail colour, texture, or shape. They are specialists in diagnosing and treating nail abnormalities and can determine whether the changes are harmless or indicative of underlying health issues.
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Smoking
One of the most common reasons for yellow fingernails is smoking. This discolouration is caused by the tar in cigarettes, which has a black-brown colour and spreads and settles on the skin when a cigarette is burned. The appearance of "smoking fingertips" varies from person to person but generally involves a yellow-brown stain on the fingertips of the thumb, index finger, and middle finger. The stain may be more concentrated between the first and second joints of the index and middle fingers if that is how you usually hold a cigarette. This discolouration is not considered dangerous, but it may be a sign of long-term smoking or unfiltered smoking, which can increase your risk of smoking-related side effects.
The yellowing of the fingernails due to smoking is sometimes referred to as "Harlequin nails" or the "nicotine sign". It is a type of skin discolouration related to smoking, affecting parts of the body that come into close contact with smoke. While the discolouration itself is harmless, smoking can lead to other complications in the hands, such as premature ageing, delayed wound healing, increased risk of infections, and inflammatory skin conditions.
In addition to the cosmetic effects of smoking on the skin, there are also serious health consequences. Smoking is the most common risk factor for chronic obstructive pulmonary disease (COPD) and is strongly associated with cardiovascular disease and cancer. It is responsible for 30% of all cancer deaths.
If you are looking to remove the yellow stains from your fingernails, there are some home remedies you can try. Lemon, baking soda, and nail polish remover can help to reduce discolouration. However, frequent use of nail polish remover is not recommended as it can be harsh on the skin and nails.
The best way to prevent and reverse yellow fingernails caused by smoking is to quit smoking or switch to tobacco products that do not contain tar, such as snus.
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Underlying disease
Yellow nails can be indicative of underlying diseases or infections. For instance, lung disease and rheumatoid arthritis can cause yellow nails. This is also known as "Yellow Nail Syndrome", which is characterised by yellow nails that lack a cuticle, thicken, and seem to stop growing. In addition, skin cancers near the nail and fingertip can distort the nail. Subungual melanoma, the most serious type of skin cancer, will normally appear as a dark streak down the length of the nail. Hutchinson's sign is a darkening of the cuticle associated with a pigmented streak and may be a sign of an aggressive melanoma. Furthermore, according to the American Academy of Dermatology, yellow nails and fingers are tell-tale signs of smoking due to repeated exposure to tar in tobacco smoke.
Moreover, white nail syndrome, also called leukonychia, can occur with arsenic poisoning, heart disease, renal failure, pneumonia, or hypoalbuminemia. Certain antibiotics can also cause lifting of the nail from the nail bed, and chemotherapy medicines can affect nail growth. Beau lines, or depressions across the fingernail, can occur after illness, injury to the nail, eczema around the nail, or when you do not get enough nutrition.
Nails can also exhibit abnormalities in shape, such as koilonychia, where the nails are thin, spoon-shaped, and curved inward, which may be associated with iron deficiency or iron deficiency anaemia. Pitting, or small depressions on the nail surface, is associated with diseases such as alopecia areata and psoriasis. Ridges are tiny, raised lines that develop across or up and down the nail, and can be caused by crushing the base of the nail or the nail bed, which may cause a permanent deformity.
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Frequently asked questions
There could be several reasons for your index finger nail turning yellow. It could be as simple as a nail polish stain, or an indication of something more serious, such as:
- Fungal infection
- Yellow nail syndrome
- Lung disease
- Rheumatoid arthritis
- Smoking
- Iron deficiency
Yellow nail syndrome is a condition characterised by yellow nails that lack a cuticle, grow slowly, thicken, and may have a yellow-green discolouration. It can be a sign of lymphoedema, especially of the ankles, and compromised respiration.
Yes, wearing nail polish, especially darker shades, can stain nails yellow. The dye in the nail lacquer interacts with the keratin in the nail, causing discolouration and brittleness.
Yes, according to the American Academy of Dermatology, yellow nails and fingers are tell-tale signs of smoking due to repeated exposure to tar in tobacco smoke.
Yes, an iron deficiency can cause koilonychia, where nails become thin, spoon-shaped, and dip down in the middle.
