I've been in medicine for over twenty years. I've been in war zones. Do you know how many times I've seen soldiers fight on even though they're gravely injured? Do you know how many times I've seen firefighters, police officers, doctors, keep going past what they physically should? Speaking from experience, I get why people don't notice, and I've seen how much worse it is when people don't pay attention to what's happened to them, or when they refuse to slow down. What I'm trying to say is pay attention to your body.