Differential diagnosis of causes of hypothyroidism
-deficient pituitary thyroid stimulating hormone
-drugs causing hypothyroidism such as amiodarone, lithium, propylthiouracil, methimazole, phenylbutazone, sulfonamides, interferon
-subacute (de Quervain’s) thyroiditis after initial hyperthyroidism
-thyroid surgery, irradiation, or radioiodine
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