Normal thyroid-stimulating hormone (TSH) levels generally fall between 0.5 and 5.0 milliunits per liter (mU/L). If your TSH level is higher than 5.0 mU/L it suggests an underactive thyroid, or ...

Having either high or low levels of high-density lipoprotein (HDL) cholesterol, or "good" cholesterol, is tied to a small increased risk of dementia in older adults, according to a study published in ...

So-called “good” HDL cholesterol may not be as healthy as experts once thought, a new study suggests. The new study, published Wednesday in Neurology, found that having either high or low levels of ...

Testosterone levels peak during male puberty and decline with age in both males and females. With low testosterone in males, you can have a decreased sex drive, trouble with erections, and low sperm ...

Dopamine affects movement control, emotion regulation, and thinking skills. When dopamine levels are typical, they promote good health, while atypical levels can lead to health concerns. The above ...

DEAR DR. ROACH: My mother’s blood test has a sodium level of 130 mEq/L. She is not on diuretics, and she does not have heart or kidney problems. She is on thyroid medication and omeprazole. Do I need ...