Elevated levels of thyroid hormone appear to harm the aging brain, increasing seniors' risk of dementia or other cognitive disorders, a new study finds.

Thyroid level tests, including the TSH test, can determine if your thyroid is producing too much or too little thyroid hormone. Here’s what the results mean.

In the Third National Health and Nutrition Examination Survey (NHANES III), the prevalence of an elevated thyroid-stimulating hormone (TSH) in 17,353 people older than age 11 years in the United ...

Thyroxine and thyroid stimulating hormone levels: New research. ScienceDaily . Retrieved June 3, 2025 from www.sciencedaily.com / releases / 2010 / 03 / 100315230910.htm ...

TSH Testing Variables. These are 10 factors that can affect your thyroid levels: You get tested at different times of the day. Thyroid hormone levels tend to go up at night and down during the day ...