If you've been having heart palpitations and unexplained weight loss, it could be a sign of an unhealthy metabolism brought about by a problematic thyroid. While you won't know for certain until you see a doctor, you may be able to get a better idea of your condition by giving yourself a quick check-up.

Take a look at the gallery below for a quick thyroid 101, but remember to see a doctor if you're feeling off rather than self-diagnose.

(First published as "Vital Signs" in the "Better Body" section of Good Housekeeping Philippines' January-February 2006 issue. Adapted for use in Female Network. Photo by osmachosant via Flickr Creative Commons.)

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