Low TSH, High T4

ladybud

It is possible with a high T4 and low TSH, that your dose of synthroid is too high, but you are not converting the T4 to T3, which is the most important part. That can make you feel tired, etc. even with what appears to be hyperthyroid lab results. It would help to get your free T3 measured, which could be low, and you might feel better on a combo of synthroid and Cytomel (T4 plus T3) or armour thyroid, a natural thyroid that has both components in it. Synthroid and Levoxyl are just T4. I would talk with your Dr about this, and make sure you are seeing a Dr. who really understands thyroid treatment in depth.

MrA77

Yeah I agree with Ladybud, it sounds like you may not be converting enough T4 to T3. The first thyroid tests I had done, my free T4 was near the upper part of the range and free t3 was near the bottom of the range so I take T3.

What are all the thyroid tests you've had done? Free T4, free T3, reverse T3, and an iron panel make it easier to see what is happening.