​Differential diagnosis of causes of hypothyroidism

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