Given that patients had been euthyroid (i.e., their serum TSH and T4 values did not indicate hypothyroidism), Lowe suggested that “euthyroid fibromyalgia is a clinical phenotype of partial peripheral resistance to thyroid hormone” (135, 139) (i.e., the uptake of thyroid hormones by transporters and receptors in cells is disturbed). This evidence concerns the gene TG and hypothyroidism.