A broken heart (also known as heartbreak or heartache) is a metaphor for the intense emotional stress or pain one feels at experiencing great loss or deep longing. The concept is cross-cultural, often cited with reference to unreciprocated or lost love.
Failed romantic love can be extremely painful; people with a broken heart may succumb to depression, anxiety and, in more extreme cases, post-traumatic stress disorder.
Source: Wikipedia
Being 'broken-hearted' as a result of emotional trauma may be a more apposite turn of phrase than we imagined. US researchers have shown how sudden emotional stress can release hormones that stun the heart into submission, resulting in symptoms that mimic a typical heart attack. People suffering from stress cardiomyopathy (takotsubo cardiomyopathy in Japan), or 'broken-heart syndrome', seem to be having a heart attack: they have chest pain, fluid in the lungs, shortness of breath and heart failure. But although the ability of the heart to pump is significantly reduced and the heart muscle is weakened, it is not killed, or infarcted, as in a classic attack. The syndrome is linked with elevated levels of hormones called catecholamines (particularly adrenaline).