So, I was diagnosed with Hashimotos back when I was 18 (I'm now 31). I have been very stable with thyroxine dose and levels for at least about 8 or 9 years.
A year ago I showed as being undermedicated and was raised from 150mg to 175mg levothyroxine.
I then showed as being over and since then they keep dropping the dose. I've recently been alternating daily between 125mg and 150mg. This has again come back with being overmedicated (TSH <0.05 and T4 26 point something) and my dose is dropping to 125mg (even though I feel rubbish and truely thought I was under).
I've had a lot of lifestyle changes in the past 2 years - taken up rugby and powerlifting so built a fair bit of muscle and lost around 3.5st via a calorie defecit. I'm sure this is what is prompting these changes, but I can't come up with a valid theory on how/why.
If anyone can point me in the direction of resources or have any info I would be really greatful. I am a scientist so feel free to bombard me with the technical stuff.