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People do die of a "broken" heart. It is called stress cardiomyopathy. Stress hormone levels of cortisol, adrenalin, and nor-adrenalin spike after an emotional shock and if you don't have the reserves acute heart failure can follow. If you survive, this is reversible.      

Shocking events can lead to abrupt very high stress hormones levels which can stun the heart and lead to heart failure, angina, and/or rhythm disturbances that act like a heart attack. In this "broken heart syndrome" there is no underlying heart damage. If people survive this their heart returns to normal.        

  The risk of a heart attack increases by 21 times during the first 24 hours after losingn a loved one. It is not uncommon to hear of one spouse dying and the other following in just a short time. The risk of heart attack remained 8 times above normal for a week and was still elevated to some extent after a month. The bereavement and grief associated...

  According to a presentation at the Heart Rhythm Society in May of 2013, higher levels of estrogen are associated with an increased risk for sudden cardiac death (SCD) in both men and women. Testosterone on the other hand was lower in men and slightly higher in women with SCD. More than 350,000 people die annually in the US from SCD. Some of the...