French physician Joseph Honoré Simon Beau first described "Beau's lines," or transverse ridges -- horizontal grooves on the nail -- in 1846.
Nail abnormalities can reveal a lot about your overall health.
Ridges in Fingernails – Vertical, Horizontal, Causes, Symptoms, Treatment and Removal - Skintots
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MDHealth.com; Nail ridges
What Causes Ridges in the Fingernails?
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Fingernails: Horizontal & Vertical Ridges, Nail Pitting & Shape - Disabled World
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