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Hi. I am a 38 year old female on thyroxine for under active thyroid now 4 weeks in. I am very fit - exercise mostly daily and am strong. Heart rate was 60 but since starting on 50mcg it’s climbed to 74. Is that normal? I am no less tired than I was not surprising if my heart rates shot up! Tsh was at 17.5 and the other one I can’t remember the term was low at 5,5
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