Inflammation is a part of the immune system, its not autoimmune. Inflammation results from autoimmune diseases, however that is because it is a part of our immune system from the outset.
The human body is an intricate and incredibly complex machine (more complex then any we have ever built by many orders of magnitude), I am actually amazed that (considering how much is going on, and how minuscule changes wreck functions) we don't have more issues then we do. Life is always teetering on the edge of destruction. All the more reason why studying it is so darn interesting!
Re: autoimmune - ah, I get it. That's what I get for trying to sound smart in front of people who know their shit :D
Yes, that's something I started to realize the further I went in school and life, really. When we look at the the sheer number of things that can go wrong with us (genetically, developmentally, neurologically, various-permutations-thereof-ally) ... it is frankly astounding that there are this many of us alive, walking the earth and healthy as I type this.
Yes, deeply interesting!