A major study shows that standard thyroid test ranges may be misclassifying many people, especially when age, sex, and race aren’t considered. Adjusted reference intervals reclassified nearly half of ...

High TSH levels can mean you have an underactive thyroid or a pituitary gland tumor. Low TSH levels can mean you have an overactive thyroid or issues with the pituitary gland. TSH levels are first ...

Subclinical hyperthyroidism means that a person has low or undetectable levels of thyroid-stimulating hormone (TSH) with normal levels of free thyroid hormones. It usually does not cause symptoms. The ...

Hypothyroidism is when the thyroid gland does not produce enough thyroid hormones, whereas hyperthyroidism is when the thyroid gland produces too much. The conditions have different symptoms and ...