Happiness can break your heart, doctors warn

The lethal condition 'happy heart syndrome' can occur after a joyful event such as a surprise birthday party or the birth of a child

Celebrating a birthday may not seem like a dangerous pastime but too much happiness can be heartbreaking, according to doctors.

Health experts have known for some time that sad events, such as the loss of a spouse, can trigger a condition known as 'broken heart syndrome' which feels like a heart attack and can be fatal if not treated quickly.