I posted the following story in another thread and thought it might lend itself to a lively discussion.
This past weekend, my wife asked me to taste the soup in the crock pot to make sure it was good and hot and that the potatoes were cooked. Being a typical guy, I spilled half of my taste on my shirt and the other half on my right foot. The second taste confirmed that everything was done and definately hot.
Well, I cleaned myself up, cursed my self for being a spaz, and changed my shirt. Didn't really think much about the event till later that evening when I discovered that I had severely burned my foot (3rd degree burns).
The moral of the story is, if you suffer from nerve damage, you should take the time to exam yourself thoroughly when bad things happen. It's possible that you can injure yourself and the pain from that injury either doesn't register or does not meet the threshold that you already feel.