Under active thyroid for 35 years now suddenly overactive

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I have had an under active thyroid for 35 years and for much of the time been on 200 mcg of Thyroxine with annual check ups.  In January my voice became very hoarse (it still is) and separately to this GP reduced Thyroxine to 150 mcgs.  ENT Consultant says no connection between hoarseness and Thyroid levels.   Repeat TSH and T4 level in August and GP has dropped Thyroxine to 50 mcg !!  I am worried because all these years I have been told Thyroid gland not working at all, now told in over active category.   Has anyone heard of this before ?   GP can't explain.  Hospital say have Speech Therapy.   Strange that hoarseness has been same length of time as change in thyroid levels - I feel I am going round in circles and getting nowhere.   It is now ten months down the line.  I am 67 years old.

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    Hi Sams55, I have just been diagnoised with overactive thyroid, after being underactive for 20 years. I am 67 years of age as well. My doctor told me that my readings more or less went through the roof, so therefore My thyroid has more or less worked better and I was taking too much Thyroxine, that is why he has reduced it. I have been taking 150mcg, 100mcg and 50mcg, over the last 20 years, now he has reduced from 100mcg to 75mcg. He wanted to lower it to 50mcg, but I was reluctant to drop too much. He will check my blood in 4 weeks time, so fingers crossed, it will level itself out. Hope you get sorted Sams55, because upset with your thyroid is awful for you. xx

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