RT Journal Article SR Electronic T1 Thyrotoxicosis in patients with hypothyroidism is not just overtreatment JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr-2017-221061 DO 10.1136/bcr-2017-221061 VO 2017 A1 Punith Kempegowda A1 Ananth U Nayak YR 2017 UL http://casereports.bmj.com/content/2017/bcr-2017-221061.abstract AB A 62-year-old Caucasian woman presented with hypothyroid symptoms and biochemical thyrotoxic picture. Previously, she underwent right-sided subtotal thyroidectomy and left partial thyroid lobectomy for thyroid lumps, and treated with thyroxine replacement for hypothyroidism. Although there were no significant findings on clinical examination, investigations confirmed thyrotoxicosis with positive autoimmunity against thyroid gland—all in line with a diagnosis of Graves’ hyperthyroidism. We would like to highlight atypical presentations of thyroid dysfunction and conversion of underactive to overactive thyroid status with this case. Early recognition, diagnosis and intervention are essential to prevent and/or reduce associated morbidity and mortality. When encountered with such clinical conundrums, we recommend seeking opinion from an experienced endocrinologist while interpreting such situation.