I am hypothyroid, taken 2.0 SYNTHROID for 25 years. Started ADVAIR last spring. Last summer my TSH went skyhigh-69.5, then 79.5. Increased synthroid to 2.5, then different med at 3.5. Stopped the ADVAIR which I had started last spring, asthma was doing great. TSH dropped like a rock, now am back to 2.0 synthroid. Just today made the connection.
Hello and WELCOME!
I am also co-cl on the thyroid disorders community but not sure the reasons why as you ask. Feel free to post on thyroid, too .. somebody there may know!
C~