High TSH levels usually mean the thyroid is underactive, which is called hypothyroidism. TSH levels can change due to factors like age, sex, and pregnancy. TSH influences thyroid hormones that control ...

Thyroxine and L-thyroxine are two of the 10 most frequently prescribed medicinal products. "One large health insurance company ranks thyroid hormone at fourth place in the list of most-sold ...

Q: I was told I have an underactive thyroid gland. After I started taking thyroid hormones, my TSH read 4.7. Three months later, it dropped to 0.8, and the doctor told me to reduce my dose of thyroid ...