Happiness can trigger a heart condition that can lead to heart attacks and even death, say researchers.
Previously it was thought that takotsubo syndrome (TTS), which is known as 'broken heart syndrome', was triggered by episodes of severe emotional distress, such as grief, anger or fear.
However, this new study, published in the European Heart Journal, suggests that happiness can break your heart too.
TTS is characterized by a sudden temporary weakening of the heart muscles that causes the left ventricle of the heart to balloon out at the bottom while the neck remains narrow. This creates a shape resembling a type of octopus trap used in Japan - from where the condition derives its name.