We learned that if we saw an X with a square around it, we should not enter. It's unsafe. If your job is to help search for others and you get hurt and can no longer search, how much help would you be? It's taken me years to realize this lesson applies to how we take care of ourselves in our own lives.
I can't emphasize enough how important it is to really know what your body and mind are trying to tell you. We're all here for our own individual purpose, and if you don't listen to it and only treat these signs as symptoms of a disease that you treat purely through external remedies, you'll have lost yourself in the process.