<prompt> All are true about Hyperthyroidism EXCEPT:AnxietyPalpitationsTachycardiaWeight gain  <response>: Ans. d Weight gainRef.: Harrison 19th ed. 152 T3 and T4 have sympatho-mimetic activity and they affect basal metabolic rate. Hence in thyrotoxicosis the increase in BMR will lead to weight loss. The sympatho- mimetic activity leads to anxiety palpitations and tachycardia. 