The thyroid gland is located on the front of the neck below the laryngeal prominence, and makes hormones that control metabolism.

[2] In Hashimoto's thyroiditis, the hypothyroidism is most often permanent, with symptoms are fatigue, weight gain, depression, dry skin, and constipation.

[3] Symptoms of hyperthyroidism include weight loss, irritability, anxiety, insomnia, fast heart rate, and fatigue.

[1] Drug-induced thyroiditis may be caused by some drugs, such as lithium, amiodarone, interferon treatment, and immune check point inhibitors, and resolves after discontinuation of the drug.

[1] Riedel's thyroiditis, inflammation in which the thyroid tissue is replaced by fibrous tissue which can extend to neighbouring structures, is associated with IgG4-related systemic disease in which symptoms of autoimmune pancreatitis, retroperitoneal fibrosis and noninfectious aortitis also occur.