Abstract
We experienced a case of hypothyroidism who presented acute hallucination and delirium that could be easily mistaken as schizophrenia. A 42-year old woman was admitted to our psychiatric hospital because of a sudden onset of hallucination and delusion. She was diagnosed as Hashimoto hypothyroidism because of severe hypothyroidism, presence of thyroid autoantibodies and both her sociable premorbid character and her good adjustment to society. Her mental state and hypothyroidism were improved after administration of both levothyrine sodium and risperidone. In conclusion, we recommend to evaluate the thyroid function test when the patient presents hallucination and delusion at the time of the admission to hospital.
