<human>: My doctor wants me to take a thyroid medication. What does it do?
<bot>: Thyroid medications are used to treat hypothyroidism, which is a condition where the thyroid gland produces too little hormone. The most common form of treatment for this condition is to replace the missing hormones with synthetic forms of the hormones produced by the thyroid gland. These synthetic hormones help to restore normal thyroid function and reduce symptoms such as fatigue, weight gain, constipation, and depression.