@healthy4life – The first time I heard of it was when I went to the doctor because I was so fatigued all the time. I really didn't do that much physical labor, so I didn't get it.
I had low blood pressure, too, and I didn't know why. He told me that I had an abnormal anion gap and I needed treatment.
I'm glad that he listened to me, because in the past, I've had doctors just ignore the fact that I'm tired all the time. They chalk it up to stress or laziness, but this doctor actually took this time to run a test and get some results.