A few: There are a few disorders that can have similar symptoms as hyperthyroidism: anxiety, panic attacks, mood disorders, hyperparathyroidism, cocaine/amphetemine abuse, caffeine overdose (chronic), drug overdose or drug withdrawal, myasthenia gravis, cancer...
Answered 7/20/2012
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Multiple: Anxiety state, tumor of adrenal - pheochromocytoma, inflammation of the thyroid, intake of thyroid tissue, heart disease, lesions behind the eyes. However, commonly available laboratory tests can usually distinguish among these causes.
Answered 10/18/2016
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