Harvard Women's Health Watch

Could you have a thyroid problem-and not know it?

The symptoms of a mildly overactive or underactive thyroid aren't always obvious. Learn when you need to get tested.

You're feeling tired and having trouble concentrating. You've been losing—or gaining—weight without trying. Are these just signs that you're getting older, or could you have a thyroid problem?

Women are more likely than men to have problems with their thyroid, the butterfly-shaped gland in the neck that produces the hormones (T3 and T4) that regulate metabolism. The thyroid can be overactive (hyperthyroidism), meaning that it produces too much of these hormones. Or, it can be underactive (hypothyroidism), meaning that it produces too little of these hormones.

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