The thyroid is like a speed control or accelerator for the body. An overactive thyroid can leave a person feeling ‘revved up’, even when they should be getting ready to sleep at bedtime. An underactive thyroid slows a person down, and may cause symptoms of depression, fatigue, and weight gain. In both cases, the root cause may be the thyroid. We explore how the thyroid becomes dysfunctional, how best to support the client/patient with lifestyle changes, and most importantly proactive steps for thyroid health.