If you suddenly have symptoms of low blood pressure—fainting, fatigue, blurred vision, and breathlessness—make sure to lie ...

A sudden drop in blood pressure of just 20 mmHg, such as a change in systolic pressure from 100 mmHg to 80 mmHg could cause symptoms, and bigger drops could be related to a medical emergency.

DEAR DR. ROACH: I have been confused about what normal blood pressure is for me (or anyone). I know there are some issues on what normal is today, but let us say that normal is 120/80 mm Hg. Does ...

Blood glucose levels drop during the night, ... Low blood sugar in the mornings, also known as morning hypoglycemia, can make people feel faint, light-headed, or confused.

This technology could eventually replace getting blood drawn at the local doctor's office, geneticist Michael Snyder says. But it's not there yet.

Dear Dr. Roach: I have been confused about what normal blood pressure is for me (or anyone). I know there are some issues on what normal is today, but let us say that normal is 120/80 mm Hg. Does ...

Other companies are currently developing blood tests based on a single drop, but Snyder envisions his being conducted more regularly at home, rather than during an occasional doctor's visit.