Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The symptoms: The woman ...

Since she was an infant, a 31-year-old woman had been experiencing bursts of uncontrollable laughter, but her condition had never been formally diagnosed until now. According to the woman, she would ...

A woman had experienced sudden bursts of uncontrolled laughter her whole life. A brain scan revealed why. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...