Aluminum phosphide poisoning can cause horizontal nail grooves and hair loss.
11 citations
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November 2005 in “The Journal of Dermatology” A man's crushed thumb caused unusual horizontal nail ridges on all fingers of one hand.
11 citations
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October 1980 in “Archives of Dermatology” Beau's lines and hair loss in a patient were linked to severe stress on the body.
7 citations
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June 2021 in “JAAD Case Reports” A woman had hair loss, nail changes, and skin peeling after a COVID-19 infection, which got better on their own.
7 citations
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January 1989 in “Leprosy Review” A woman with leprosy improved after stopping dapsone and getting treatment for a severe skin reaction and nail changes.