Toothache. Most general pain I can just tolerate until it goes away. But I become completely useless with a toothache. I’m not productive and I’m irritable. I grab a painkiller as soon as I can.
This one just recently as I’m getting older: lower back pain. Getting up after sitting down for a while in an awkward position and the pain is so bad that I literally collapse into a squatting position with my hands on the ground until I can slowly get up again.
The problem is now that I can afford to do whatever I want, sleep whenever I want, and eat whatever I want, my body can’t afford to.