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What does the half moon at the base of the nails mean?

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So, no, a barely visible lunula is not cause for panic. Rather, its progression over time, or the sudden introduction of abnormalities, can be cause for concern—if you consider the whole picture.
Changes to watch out for, but without overdramatization
If you observe that the lunula is taking up more space than usual—more than a third of the nail—it may be worth paying attention to. Some consider this an indirect indicator of hyperthyroidism, hypertension, or even cardiovascular stress. However, this phenomena must continue to afflict multiple fingers over an extended period of time.
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A lunula that seems to vanish entirely? It could indicate persistent weariness, a lack of iron, or a deficiency in vitamin B12. However, be cautious: it’s best not to draw inferences based on a single nail.
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