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 ...

Keeping an eye on your thyroid-stimulating hormone (TSH) levels is key to catching any signs of thyroid dysfunction early on. That's because an underactive thyroid (hypothyroidism) or overactive ...

A TSH test measures blood levels of the thyroid stimulating hormone to diagnose a thyroid disorder. Your doctor will order a TSH test if you exhibit thyroid disorder symptoms like hair loss or fatigue ...