Liam Carter
The white half-moon shape at the base of your fingernail is known as a lunula. While the lunula is usually white, changes in its colour and size can indicate an underlying disease. For example, a blueish tint could suggest Wilson's disease, a rare inherited genetic disorder in which copper accumulates in the liver, brain, and other organs. Red lunulae may indicate heart failure, and half-and-half nails, where the white from the lunula extends halfway up the nail bed, may be a sign of severe kidney disease.
| Characteristics | Values |
|---|---|
| General Appearance | The white part of a nail is called a lunula, which is Latin for "little moon". It is a whitish, half-moon shape at the base of the nail, just above the cuticle. |
| Colour | A blueish tint to the lunula could indicate Wilson's disease, a rare inherited genetic disorder where copper accumulates in the liver, brain, and other organs. Pale blue lunulae may be a sign of undiagnosed or uncontrolled diabetes. Azure lunulae can indicate cyanosis, a condition caused by poor circulation or inadequate oxygenation of the blood. Blue-grey lunulae may be a sign of silver poisoning. Red lunulae may indicate heart failure or certain types of heart and lung disease. Brown or black lunulae can be caused by excessive fluoride intake. |
| Visibility | Lunulae are not always visible and can vary in appearance across each nail. Their absence does not always indicate a serious health problem, but it is recommended to discuss any concerns with a doctor. |
| Size | Lunulae are usually biggest on the thumbnail and decrease in size until they are barely visible on the pinky finger. Large lunulae may be common in athletes and people who engage in lots of physical activity, but there is currently no research to support this claim. |
| Shape | Pyramidal lunulae, where the moons of the fingernail form a triangle shape, are usually caused by improper manicures or other trauma to the fingernail. |
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What You'll Learn
The white part of the nail is called a lunula
Not everyone has a visible lunula on each nail, and they may vary in appearance across each nail. Healthy lunulae are usually white or whitish and take up a small portion of the bottom of the nail, being most visible on the thumb and gradually shrinking in size towards the pinkie.
The lunula is located on the newest part of the nail, and its appearance can sometimes indicate an underlying health condition. For example, red lunulae may indicate heart failure, while blue lunulae could suggest Wilson's disease, a rare inherited genetic disorder that causes a build-up of copper in the liver, brain, and other organs. Yellow lunulae could be a sign of chronic bronchitis or other lung diseases, or the use of tetracycline medications, while brown or black lunulae could be caused by excessive fluoride intake. Silver poisoning may cause blue-grey lunulae, and in some cases, an absence of lunulae could indicate anemia, malnutrition, or depression. However, it is important to note that not all changes to the nail are cause for concern, and some may be harmless or a normal part of aging. If you notice any significant changes to your nails or other symptoms, it is always best to consult a healthcare professional.
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Large lunulae may indicate issues with the cardiovascular system
The white part of the nail, known as the lunula or half-moon, is usually visible on the thumb and appears smaller on the other fingers. Healthy lunulae are typically whitish or ivory and take up a small portion of the bottom of the nail.
Large lunulae, however, may indicate issues with the cardiovascular system. Cardiovascular diseases (CVDs) affect the heart and blood vessels, and symptoms can vary depending on the cause. While older adults and women may exhibit more subtle symptoms, they can still experience serious cardiovascular disease. Some symptoms of cardiovascular disease include:
- Chest pain (angina)
- Chest pressure, heaviness, or discomfort
- Shortness of breath (dyspnea)
- Dizziness or fainting
- Fatigue or exhaustion
- Pain or cramps in the legs when walking
- Leg sores that aren't healing
- Cool or red skin on the legs
- Swelling in the legs
- Numbness in the face or a limb
If you notice an abnormally large lunula, it is recommended to consult a doctor, especially if you are experiencing other unusual symptoms.
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Blueish lunulae could suggest Wilson's disease
The white half-moon shape at the base of the fingernail is called a lunula. It is part of the nail matrix, which is the tissue just beneath the nail that contains nerves, lymph, and blood vessels. Lunulae are usually white, but they can change colour and provide clues about a person's health. For example, blueish lunulae could suggest Wilson's disease, a rare inherited genetic disorder in which dangerous levels of copper accumulate in the liver, brain, and other organs.
Wilson's disease can cause a wide range of symptoms, including blue nails, even in the absence of other symptoms. In one case, a boy with Wilson's disease showed a bluish discoloration of the lunulae portions of his thumbs and great toes. The bluish discoloration may be related to the increased body copper content, although the specific pathogenesis is not yet known. Azure lunulae are an unusual change in the fingernails of patients with Wilson's disease.
It is important to note that not all changes to the nail are cause for concern. Some are completely harmless, a normal part of aging, or a side effect of medication. For example, small or missing lunulae usually aren't cause for concern. Similarly, the absence of lunulae does not always indicate a serious health problem, and they may simply be less visible due to skin colour or other factors. However, if you notice changes in your nail appearance and are experiencing other unusual symptoms, it is a good idea to consult a doctor.
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Red lunulae may indicate heart failure
The white half-moon shape at the base of the fingernail, just above the cuticle, is called a lunula. It is part of the nail matrix, the tissue just beneath the nail that contains nerves, lymph, and blood vessels. The lunula is usually most visible on the thumbnail and decreases in size until it is barely visible on the pinky.
Healthy lunulae are typically whitish or pale in colour. However, red lunulae may indicate heart failure. Research shows that red lunulae are associated with cardiac failure, specifically. This is because red lunulae are thought to be caused by increased arteriolar blood flow, a vasodilatory capacitance phenomenon, or changes in the optical properties of the overlying nail, making the normal blood vessels more apparent.
Red lunulae are also associated with other disorders, including systemic lupus erythematosus, reticulosarcoma, psoriasis, hepatic cirrhosis, lymphogranuloma venereum, rheumatoid arthritis, alopecia areata, and carbon monoxide poisoning.
While changes in the colour of the lunula can indicate an underlying disease, it is important to note that not all changes to the nail are cause for concern. Some changes are completely harmless and may be a normal part of aging or a side effect of medication. If you notice a change in your nail appearance and are concerned, it is always a good idea to discuss the issue with a doctor, especially if you are experiencing other unusual symptoms.
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The absence of lunulae may be a sign of a vitamin deficiency
The white part of the nail, known as the lunula or lunulae in plural, is the half-moon shape at the base of the fingernail. Lunulae are part of the nail matrix, which refers to the tissue just beneath the nail that contains nerves, lymph, and blood vessels. While most people have lunulae, they may not always be visible due to factors such as skin colour.
Lunulae are usually a whitish colour and are most visible on the thumbnail, gradually shrinking in size until they may be barely visible on the pinky finger. In some cases, the absence of lunulae may be a sign of a vitamin deficiency, among other health conditions.
While the absence of lunulae may not always indicate a serious health problem, it is recommended to discuss any concerns with a doctor. The disappearance of the lunulae could be a sign of malnutrition or a minor nutritional deficiency. In some cases, it may be an indication of anemia, which is common in people undergoing dialysis for kidney failure. It is also associated with vitamin and mineral deficiencies, which can be detected through blood tests.
In addition to vitamin deficiencies, the absence of lunulae may be a sign of other health conditions such as vitiligo, a chronic skin condition that causes the skin to lose colour in patches. Other possible conditions include thyroid disease, sun-related skin issues, and depression. However, it is important to note that small or missing lunulae are usually not a cause for concern and can be a normal part of aging.
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Frequently asked questions
If your nails are completely white, it could be Terry’s nails, which may reflect an issue with the liver, kidney or heart. It could also be an inherited genetic trait.
Small or missing lunulae usually aren't cause for concern. However, it may indicate a vitamin deficiency, anemia, malnutrition, or depression.
A blueish tint on the lunula could suggest Wilson’s disease, a rare inherited genetic disorder where copper accumulates in the liver, brain and other organs. Pale blue lunulae may indicate undiagnosed or uncontrolled diabetes. Red lunulae may indicate heart failure.
