So why is laughter so hard to control? Research suggests that there are two kinds of laughs: helpless, involuntary laughter ...

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 ...

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 ...

Two sets of published diagnostic criteria are available to help differentiate PBA from depression. The first set of diagnostic criteria was developed by Poeck in 1969. 3 These 4 criteria include: ...

When I was little, I tended to fall into bouts of uncontrollable laughter. Basically, once I started laughing, I found it very difficult to stop. The problem was particularly acute in contexts where I ...