Abstract: Increased thyroid hormones level is associated with diminished bone density. It has been clarified that thyroid hormones by sirculating bone resorption lead to decrease in bone density. Thyroid hormone in many cases as in Non - Toxic Grotre & in supplement therapy in hypothyroidism is used as a drug & it is possible that suppressive therapy with T4 causes subclinical - hyperthyroidism. Studies done in west has shown different results ...