that happened weeks or months earlier, rather than something happening today.
For example, if you had a significant illness several months ago and now notice a horizontal groove moving toward the tip of the nail, the two events could potentially be related.
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The nail essentially carries a small record of its growth history.
A nail line can provide a clue—not a complete medical history.
When Should You Pay More Attention?
A nail change is more worth discussing with a healthcare professional when it is:
New, persistent,
