The thyroid gland produces hormones that influence multiple bodily functions including heart rate, body temperature, metabolism, digestion, mood, cognitive function, and sex hormone levels.

Your thyroid helps control your body's daily rhythms and hormone activity by listening to your brain and telling other hormone glands what to do.

Thyroid hormone doesn’t directly make sex hormones like testosterone or estrogen, but it helps the body’s sex glands work properly so they can produce these hormones at the right levels.

When there is too much thyroid hormone in the body, the rate at which the body uses energy increases, resulting in more frequent bowel movements, loss of body weight, and a higher body temperature.