TG and fibromyalgia: 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).