AI summary
Summary of article:
If the nail crescent is red, it may reflect heart, lung, autoimmune, or other systemic diseases, but if only one nail turns red, it may simply be a local injury.
How your nail crescents look isn’t just a matter of looking good, their condition can be one of the easiest ways to detect underlying health conditions.
The New York Post reported that the lunule, which originally means “little moon” in Latin, is a half-moon-shaped area at the base of the nail where new nail cells are formed and then slowly grow toward the fingertip. The crescent is most pronounced on the thumb, and gradually becomes smaller and less pronounced toward the little finger.
The first study to examine special and unusual crescents was published in 1954, and researchers hoped to learn what health information these tiny crescents might reveal. The lunula is usually white because the nail is thicker there, covering the blood vessels in the nail bed. However, not everyone has a clear crescent, and the absence of a crescent does not mean the body is unhealthy.
However, if the crescent moon appears red, it may be a warning sign of danger. “Red crescents may reflect systemic disease activity or local lesions,” the study authors wrote. Nails are very sensitive to changes in physical health. To keep growing, nails need a steady supply of nutrients, oxygen, and blood. Changes in any of these will affect the way nails grow.
This is why people have long viewed their nails as an indicator of their health. In the first relevant report in 1954, London researchers found that 61% of people examined with red crescents had heart failure. Other people with red crescents have systemic diseases such as emphysema and chronic bronchitis (both chronic obstructive pulmonary disease, or COPD), cirrhosis of the liver, and cancers including polycythemia vera, lymphoma (cancer of the white blood cells), and myeloid leukemia.
Since then, more studies have shown that red crescents are also related to autoimmune diseases, including alopecia areata (hair loss in round patches, commonly known as “ghost shaving”), dermatomyositis, and systemic lupus erythematosus.
The study authors also noted that red crescents are associated with congestive heart failure, psoriasis, carbon monoxide poisoning, and lymphogranuloma venereum (LGV). LGV is a sexually transmitted disease caused by a specific strain of chlamydia; However, it is still unclear why the red crescent is associated with the above disease.
The researchers also noted that this relationship only existed when red crescents appeared on the nails of multiple fingers. If there is a red crescent on only one nail, the cause is more likely to be a local problem, such as an injury under the nail.
A red crescent moon does not mean that there is something wrong with your body, just as a white crescent moon does not mean that you are completely healthy. The authors stated that the purpose of this retrospective study is only to suggest that if patients develop a red crescent when seeking medical treatment, further investigation should be considered. Clinicians should pay attention to the association with systemic diseases or skin diseases, which can help in early detection and identification of significant systemic diseases.
Summary FAQ
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Red crescents may reflect systemic disease activity or indicate local lesions. The doctor will pay special attention to heart failure, lung disease, autoimmune diseases, and other conditions as clues for further investigation.
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Studies have linked red crescent to heart failure, emphysema, chronic bronchitis, cirrhosis, cancer, alopecia areata, dermatomyositis, lupus erythematosus, psoriasis, and carbon monoxide poisoning.
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If a red crescent appears on only one nail, it is more likely to have a local cause, such as an injury under the nail, rather than necessarily a systemic disease. Only when multiple fingers are visible, the correlation is more noticeable.
