Anemia is pretty common, especially in teenage women, it seems. Something to get checked out.

Easy way and free way to check? If there's a blood drive going on, they check your blood for anemia - if you have it, they won't let you donate, if you don't have it, you'll know that's not it, and have the plus of being able to donate blood and maybe save a life!

Just saves the expense and wait of making a doctor's appointment, but if you have it, you should see a doctor anyway. It's easily fixed, once you know.

Though as was mentioned, some people do have a normally higher body temperature than others. Make sure your hands and feet are warm - good fuzzy socks, mittens, not gloves ... can't hurt!

My body temperature is normally lower than most people's, so much that I always have to ask if "normal" is 98.6 or 96.8. I know that it's 98.6, but I'm lucky if I hit 97, unless I am sick.