Recent comments in /f/askscience

BuccaneerRex t1_jcs47tz wrote

Reply to What causes raised ridges in human fingernails/toenails? by afcagroo

Nails grow from a band of cells outward, so if some of those cells are damaged or changed in some way, that section of the band will change, leading to longitudinal ridges as those changed parts grow outward.

If you find horizontal bands on your nails, you may want to consider medical advice, as it can indicate underlying health conditions. The cells did not grow properly for some period of time, which can be of concern.

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squigster037 t1_jcs3x1c wrote

Reply to comment by [deleted] in What causes raised ridges in human fingernails/toenails? by afcagroo

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.

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