Now, hyperthyroidism is the opposite. We basically have an excess of T three T four hormones in our blood. So that means our thyroid gland is being over stimulated. And one reason why this takes place is a result of some type of tumor on our thyroid gland. So if we have too many of these T three T four molecules, we're going to feel very anxious. And that's because our body's metabolic rate will increase.