Your thyroid gland is a butterfly-shaped gland just in front of your windpipe. Its job is to control your metabolism. When your thyroid gland doesn’t work properly, you may notice symptoms such as palpitations and weight loss (caused by an overactive gland) or depression and hair loss (caused by an underactive gland). Two in every 100 people in the UK will suffer from a problem with their thyroid gland, and 3% of women aged 50 or over are taking thyroid hormones.

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