I was diagnosed with high TSH levels some years ago, & as I didn`t have any obvious symptoms my doctor decided to moniter me. Recently I developed high cholesterol, & my doctor decided to start me on a low dose (25mg) of thyroid hormone. Iv`e been tested for thyroid antibodies, which was negative, & means that I don`t have Hashimoto`s disease, so why has my thyroid become underactive, could it be something that Iv`e done that caused it?
More important is what your Free T3, Free T4 and TSH tests show. If you have those labs, please post them, along with reference ranges that vary lab to lab, and have to come from your own report.