Thyroid Disorders

<p>If you have a thyroid disorder&mdash;<em>hyper</em>thyroidism or <em>hypo</em>thyroidism&mdash;your <a href="/health/thyroid-gland/function-of-thyroid-gland" target="_blank">thyroid gland</a> makes too much or too little <a href="/health/thyroid-gland/what-is-thyroxine-t4" target="_blank">thyroid hormone.</a> One of your thyroid&#39;s main jobs is to regulate your <a href="/health/how-the-metabolic-process-works/what-is-metabolism" target="_blank">metabolism,</a> so a thyroid problem may cause sudden weight loss or weight gain, fatigue, a fast heart rate or extreme sensitivity to hot or cold. Other thyroid disorders include <a href="/health/thyroid-disorders/why-do-women-get-thyroid-nodules" target="_blank">thyroid nodules</a> and <a href="/health/thyroid-cancer-2/is-thyroid-cancer-common" target="_blank">thyroid cancer.</a></p>