Maybe you thought it was just a way to describe a lost love.

But scientists now say there is such a thing as a broken heart and it's very dangerous.

In women, the triggers are usually intense grief, fear or anger.

Doctors now know that sudden emotional stress can cause severe, but reversible, heart muscle weakness which mimics a classic heart attack.

They call it: Broken Heart Syndrome.

"The difference is when these people are taken to the cath lab the arteries are normal and so with a typical heart attack in the cath lab you expect to find an artery with a blood clot with no flow, and in these people the flow is perfectly fine," says one doctor.

Broken Heart Syndrome is probably more common than we know.

The diagnosis could increase as more physicians learn to recognize its unique clinical features.