What causes TSH labs to change? I have been on
the same dose of levothyroxine
for three years and my thyroid went from 6 down to 2, up to 4 then down to 1, then up to 3 then down to 2, then up to 5 and down to 3. I know the levels of hormones in your body changes throughout the day, but my levels would steadily increase or decrease over the course of 6 months- for example, starting at 6, then to 4, then 3, then 2 and then turning around and climbing back up to 4.