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Causes of HypothyroidismPrimary Hypothyroidism (low T4, high TSH):Autoimmune - Hashimoto's thyroiditisIodine deficiencyDrugs - Amiodarone, antithyroid medicationsCongenital hypothyroidismSecondary Hypothyroidism (low TSH and T4):HypopituitarismIsolated TSH deficiency
