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Case Lab · Type A · Foundation

F06

A mood change with a medical link

A 45-year-old woman with a confirmed diagnosis of a thyroid disorder develops a two-month episode of persistent low mood, poor concentration, and reduced energy shortly after her thyroid levels were found to be markedly abnormal. She has clear consciousness and no prior psychiatric history. Her mood symptoms have partially improved since starting treatment for the thyroid disorder.

What is the best-supported classification?