Initially we tried low dose steroids only achieving a slight improvement of the patient´s complaints. At the same time, we noticed an enlarged, tender thyroid gland, presenting high T3 and T4 values, low TSH value and positive anti-thyroid antibodies. She initiated specific therapy. Results Facing a progressive polyarthritis, hydroxychloroquine was started in a 400 mg/d dose. Four weeks later the patient was referred to our out-patient clinic with the following complaints: insomnia,

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... incapacity of accomplish her routine daily work, and a fixed idea of general dislike towards her simultaneously with the feeling that everyone´s around was looking at her in a strange way. Hydroxychloroquine was immediately stopped and 72 h later her behaviour was back to normal. Conclusion We strongly believe that the psychiatric symptoms above were related with the hydroxychloroquine therapy.