Sophia Delgado
The small, white, half-moon shapes found at the base of your fingernails are called lunula. They are the visible portion of the distal nail matrix that extends beyond the proximal nail fold. Not everyone has a visible lunula, and they can vary in appearance from nail to nail. The shape and colour of the lunula can indicate a person's health, with blue lunulae indicating a rare inherited disorder, and red lunulae signalling heart failure.
| Characteristics | Values |
|---|---|
| Name | Lunula |
| Description | Small, white, half-moon shapes found at the base of your nails, just above your cuticle |
| Prevalence | Everyone has a nail matrix, but not everyone will see or have a lunula on each nail |
| Appearance | May vary in appearance from nail to nail and person to person; most prominent on thumbnails, gradually shrinking in size until reaching the pinkie where it may be barely visible |
| Cause for concern | Small or missing lunulae usually aren't cause for concern; they're usually just hidden underneath the cuticle or skin at the base of the finger |
| Health indicators | If the lunula turns red, it may be a signal of heart failure; if it turns white, it may be a sign of renal disease |
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What You'll Learn
The lunula is the visible portion of the distal nail matrix
The lunula has unique histologic features, with a primary structural role in defining the free edge shape of the distal nail plate. The shape of the lunula determines the free edge shape of your nail, and damage to this will define the shape. For example, if you have a natural nail shape that is round or square, this will be reflected in the shape of the lunula.
The colour of the lunula can also vary and may indicate certain health conditions. For example, if the lunula turns red, it may be a signal of heart failure. If the lunula turns white, it may be a sign of renal disease. However, small or missing lunulae usually aren't cause for concern and are often just hidden underneath the cuticle or skin at the base of the finger.
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The lunula determines the free edge shape of your nail
The lunula is the small, white, half-moon shape found at the base of your fingernail, just above the cuticle. Not everyone has a visible lunula, and they can vary in appearance from nail to nail. The lunula is most prominent on thumbnails, and you may notice that it appears smaller on the index finger, gradually shrinking in size until you reach the pinkie, where it may be barely visible. If you don't have a visible lunula, it simply means that the nail matrix is sitting lower on that nail. The more prominent the lunula, the higher the matrix is usually sitting.
Lunula can also indicate health issues. For example, if the lunula turns red, it may be a signal of heart failure. If the lunula turns white, it may be a sign of renal disease. However, small or missing lunulae usually aren't cause for concern. They're usually just hidden underneath the cuticle or skin at the base of your finger.
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Not everyone has a visible lunula
Small or missing lunulae usually aren't cause for concern. They're usually just hidden underneath the cuticle or skin at the base of your finger. However, if your lunula turns red, it may be a signal of heart failure.
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Lunula can vary in appearance from nail to nail
The lunula is the visible portion of the distal nail matrix that extends beyond the proximal nail fold. It has unique histologic features, with a primary structural role in defining the free edge shape of the distal nail plate. The shape of the lunula determines the free edge shape of your nail and damage to this will define the shape.
Although everyone has a nail matrix, not everyone will see or have a lunula on each nail. Nails that do have a lunula may vary in appearance from nail to nail and person to person. The lunula is most prominent on thumbnails and you may notice that the lunula appears smaller on the index finger, gradually shrinking in size until you reach the pinkie where it may be barely visible. If you don’t have a visible lunula, it simply means that the matrix is sitting lower on that nail. The more prominent it is, the higher the matrix is usually sitting.
The lunula may turn white, sometimes creating a nail that’s half-brown and half-white. This is sometimes called half-and-half nails and may be a sign of renal disease. People who experience chronic renal failure may produce more melanin, which can cause your nail bed to turn brown. If your lunula turns red, it may be a signal of heart failure. Small or missing lunulae usually aren’t cause for concern. They’re usually just hidden underneath the cuticle or skin at the base of your finger.
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A red lunula may be a signal of heart failure
The lunula is the visible portion of the distal nail matrix that extends beyond the proximal nail fold. It is white, half-moon-shaped, and appears by week 14 of gestation. It has unique histologic features, with a primary structural role in defining the free edge shape of the distal nail plate. The shape of the lunula determines the free edge shape of your nail and damage to this will define the shape.
Although everyone has a nail matrix, not everyone will see or have a lunula on each nail. Nails that do have a lunula may vary in appearance from nail to nail and person to person. The lunula is most prominent on thumbnails and you may notice that the lunula appears smaller on the index finger, gradually shrinking in size until you reach the pinkie where it may be barely visible. If you don’t have a visible lunula, it simply means that the matrix is sitting lower on that nail. The more prominent it is, the higher the matrix is usually sitting.
Changes in the colour of the lunula can be revealing. A red lunula may be a signal of heart failure. It is also associated with rheumatoid arthritis, systemic lupus erythematosus, alopecia areata, hepatic cirrhosis, lymphogranuloma venereum, psoriasis, carbon monoxide poisoning, twenty-nail dystrophy, and reticulosarcoma.
In patients with Wilson’s disease (hepatolenticular degeneration), the area takes on a blue coloration, a phenomenon called azure lunula. Tetracycline therapy can turn it yellow. Silver poisoning will turn the nail itself a blue-grey colour. Excessive fluoride ingestion can turn nails brown or black.
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Frequently asked questions
They're called lunula.
Everyone has a nail matrix, but not everyone will have a lunula on each nail. If you don't have a visible lunula, it means that the matrix is sitting lower on that nail.
It may be a signal of heart failure.
