system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't people who are going through cancer treatment also lose their fingernails and toenails?

I was at the zoo one time, and learned that rhinoceros horns, finger/toenails, and human hair are basically made of the same substance. So why don't people who are going though radiation treatment also lose their nails?
gpt
The nails aren't completely unaffected. You can sometimes see the effects of chemo "banded" in the nails. The growth during the time of chemo may be evident in the character of the nail while the growth before and after may look "normal." It can cause discoloration and can affect the nail beds and cuticles as well. Google image searches turn up some of the more dramatic examples.