A fast heartbeat can be caused by emotions like stress or anxiety. Dehydration, or drinking caffeine or other stimulants, can ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo credit: jacoblund - Getty Images (hearst_mens_health_171) 2.5 billion. No, it's not how old the Earth is. It's the average ...

For decades, the coronary angiogram has been considered the gold standard for detecting blocked arteries that cause a heart attack. When patients are told their angiogram is “normal”, it often brings ...