Stresses the liver, also if its used frequently for mild inconveniences you should maybe go to the doctor, as frequent headaches or stuff like that can hint to more severe stuff.
It does not stress the liver at recommended doses. Plenty of people get frequent headaches and other aches that have no other severe stuff going on, or really anything that needs to be treated more than symptomatically. Scheduled tylenol is an effective element of a pain regimen for many people.
In the US there’s also deep religious influence that paints suffering as virtue that’s been exploited by capitalists to establish a norm of pushing through the pain and continuing to work instead of taking a break to figure out what the root cause is and address it. Some also just don’t have a choice, because taking time off means not getting paid which means losing a roof over their head.
