WEnt to MD c/o hypothyroid symptoms ie, fatigue, insominia, sleepiness, brain fog, achey. lab results TSH 34.0, Free t3 & Free T4 are normal. I had been on 150mcg of Synthroid he raised it to 200mcg. He's going to check the TSH in 4 weeks. Question if Synthoid is artificial T4, why increase Synthroid if T4 normal, and what is checking TSH in 4 weeks going to show, how does Synthroid effcet the TSH? Also if T3 & T4 normal why the symptoms??