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    Hello and welcome – Lithium in particular is known to cause hypOthyroidism, and I’ve read of occasional cases where it caused hypERthyroidism due to thyroiditis (inflamed thyroid). It might be worth asking for a stand-alone lab order of Free T4 and T3, as well as antibody tests (TSI and TRAb). The challenge, though, is that if antibodies are above the cutoff, but TSH, T3, and T4 all come back in the “normal” range, we don’t have treatments that specifically target the antibodies.