Have you ever gone to work when you are in pain and or not feeling well?

I’ve gone into work only when I had back pain. I went into work after falling down a hill and spraining my ankle once. I got up, walked home which is about a mile. Got ready to go to work but then literally a few hours after that I couldn’t walk. The next day it was like it never happened though my ankle was almost back to normal. Another time I wasn’t feeling well it turns out when I did a covid test at work I had covid. I got sent home for 5 days. I knew I had it but every test I did prior to that test at work was negative.