Disorders of the HPT Axis

Disorders of the HPT axis lead to numerous psychiatric manifestations, ranging from mild depression to overt psychosis. Numerous conditions can lead to hypothyroid states, also known as myxoedema, including CNS causes of decreased TSH or TRH secretion, severe iodine deficiency, thyroid surgery, drugs, or autoimmune disorders. The most common cause of hypothyroidism is Hashimoto's thyroiditis, which is due to autoimmune destruction of thyroid tissue. Regardless of the aetiology, hypothyroidism...