Think about the jobs you had, or may still be stuck in, and the stress you got. Some of the lowest paying jobs are the most stressful, like cashier. You make something like $8.50 an hour handling cash and credit cards, standing on your feet, and they count your box at the end of the shift. If the figures don't tally up you may have to make up the difference, and there's a mark on your record when you come up short. I did cashiering as a high school kid, and remember when an asshole customer screamed at me because I accidentally shortchanged him a nickel.
I could give other examples, but made the point. No endeavor is stress-free.