title: Transient psychosis due to painless thyroiditis in a patient with anxiety disorder: a case report.
abstract: BACKGROUND
  There are few reports on thyrotoxic psychosis caused by diseases other than Graves' disease or toxic nodular goiter.
  
  
  METHODS
  A 64-year-old Japanese woman was treated for anxiety disorder in our clinic for 10 years. She had five episodes of transient psychosis during the first five years. When she developed psychosis without neck pain 10 years after her first visit, a laboratory reexamination revealed that she had subclinical hyperthyroidism, and tested positive for antithyroid autoantibodies, negative for thyroid stimulating hormone receptor antibody and had decreased radioactive iodine uptake. She was diagnosed as having painless thyroiditis. The hyperthyroidism disappeared within a month, and the psychosis lasted for three months.
  
  
  CONCLUSIONS
  To the best of our knowledge, this is the first report of psychosis due to painless thyroiditis-induced hyperthyroidism. Physical symptoms of painless thyroiditis are often so mild that careful differential diagnosis is necessary in the cases of transient psychosis.
authors: Department of Psychosomatic Medicine, Takano Hospital, 4-2-88 Obiyama, Kumamoto, 862-0924, Japan. n3koba-5zo6pu@nifty.com.
authors: Nobuyuki
authors: N
authors: Kobayashi
authors: Junichi
authors: J
authors: Tajiri
authors: Masahiro
authors: M
authors: Takano