All I can say is that sometimes a low temp. indicates a lowered resistance. For instance if you've been sick, then you get well, as soon as you are better your temp. may be down for a day. I don't know if it means anything if you've BEEN well and then it drops. If you are female, your body temp. will drop by an AVERAGE of .4 degrees the day you get your period until you ovulate, then it will rise again. Basketball up there answered the best, I just added a few extras. (yea, yea, I know it's bsktballin33, but I prefer "basketball"!