Vertical ridges can be caused by thyroid issues, aging, or hereditary... ok, after digging I found it could also be anemia/lack of iron. but the vast majority of the cases are aging, then thyroid.
https://www.webmd.com/skin-problems-and-treatments/what-to-know-about-onychorrhexis
Horizontal ridges are vitamin deficiency. or a few other things, none of which are 'working with chemicals w/o gloves' geez. https://en.wikipedia.org/wiki/Beau%27s_lines
And a chemical cause ... yea i'mma need a sauce for that.

It's my understanding that prevalence of these ridges increase as we age. Certainly true in my case.

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