March 2019 in “PubMed” Aluminum phosphide poisoning can cause horizontal nail grooves and hair loss.
11 citations
,
November 2005 in “The Journal of Dermatology” A man's crushed thumb caused unusual horizontal nail ridges on all fingers of one hand.
7 citations
,
July 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.
55 citations
,
November 2004 in “Expert opinion on drug safety” Chemotherapy often causes hair loss, nail changes, and mouth issues, but these are usually manageable.
7 citations
,
May 2014 in “Clinical practice” Cooling the scalp may prevent hair loss from chemotherapy, hair often grows back after treatment, and nail issues usually improve after stopping the drug.