I posted earlier with several neurological symptoms including burning skin, floaters in my vision, numb feet and a left calf, as well as fatigue, hair loss, loss of concentration, and memory. After extensive testing the only abnormality was a high TSH of 6.1, an additional blood test of a Free T4 was drawn days later and was described as normal at 1.6. I was started on synthroid even with this normal Free T4 result. My question is, will taking synthroid help with symptoms even if my Free T4 level is normal? What exactly is Free T4 in relationship to the synthetic thyroid hormone that I am taking? Anyone's input would be appreciated.