How blood pressure works
If you lined up all the blood vessels in your body, they’d be 60 thousand miles long. And every day, they carry the equivalent of over two thousand gallons of blood to the body’s tissues. What effect does this pressure have on the walls of the blood vessels? Wilfred Manzano gives the facts on blood pressure. Click here

Canadians face longest emergency room waits in developed world, survey finds - more

7 Things You Don't Know About Headaches

1. What's your type?
Experts say there are hundreds of different kinds of headaches. But, they fall into three basic groups, says National Headache Foundation director Seymour Diamond, MD. Tension headaches, which can be stress-related, involve tensed face and neck muscles, while vascular headaches can include migraines. The third major group of headaches includes those caused by other health conditions, like a sinus infection or a brain tumor. Read more

Doctors don’t follow back pain guidelines, study finds

A new study has found that many physicians are not following expert recommendations for the treatment of back pain. By not doing so, they are subjecting patients to unnecessary imaging tests, ineffective surgeries and unnecessary exposure to addictive narcotics, say the authors of the study published in JAMA Internal Medicine.