I'm not sure if this is what you mean but one part of me has knee pain. I've realized that I can recognize that I have the knee pain all the time but only one part of me can feel the pain and when I can, it's intense.

I also once had an abscessed tooth for a year and beyond the same kind of dull pain I feel in my knees, had no idea. When told, I was dumbfounded. I should've been in agony and I wasn't. There wasn't even a significant amount of swelling.

Also, some parts of me have asthma, others don't. Some parts get headaches, others don't. There are also the habits that vary between parts, which I gather most people have. The one that baffles me, and this is veering even further of topic, I'm afraid is that I've yet to meet a part of me that would turn down a cup of coffee, even the littles and we all seem to like it pretty much the same way.