T3 9 TSH 3.6 What does this mean?
You say birth control or other estrogen usage is the most common reason for high T3 but what if you have not ever used anything that contains estrogen yet you develop cardiac issues one day a and thyroid panel reveals high T3 but normal TSH and T4 should T3 really be overlooked because TSH says everything is normal? what could cause this to happen without estrogen usage?
most common reason for lowish free T4 and high total T3 with normal TSH ----- birth control pill or other estrogen treatment. No thyroid meds needed if this is the case.
Meds not necessarily indicated unless the TSH is abnormal.
The nodule/cyst should be evaluated by ultrasound (which has likely already been done) to see if it requires FNA biopsy.