The thyroid is a tiny gland with a big effect on your metabolism. Age, pregnancy, or other conditions can cause it to malfunction, and you may not know it unless you have a simple blood test.

If the thyroid doesn’t make enough of the thyroid hormone that governs metabolism, you may feel weak, tired and cold, and it seems that you gain weight no matter what you do. If your thyroid is overactive, you feel hyper, jumpy, and hot, and you tend to lose weight easily. That may sound great to some people, but is unpleasant for those who suffer from it.

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