Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a condition commonly associated with thyrotoxicosis. In contrast to other hyper-thyroid conditions, this condition is usually characterized by lethargy or in the worst case, unexplained congestive heart failure.

APATHETIC HYPERTHYROIDISM: "A person with apathetic hyperthyroidism is likely to feel lethargic most of the time. "

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