Have you ever heard of pseudobulbar affect or PBA? If you answered no, you're not alone. Charles Darwin first described this health condition now known as PBA more than 130 years ago, but many ...

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 ...

Involuntary crying or laughing are symptoms of a condition known as involuntary emotional expression disorder (IEED). This disorder is common among patients with stroke and other neurological ...

Add Yahoo as a preferred source to see more of our stories on Google. Q: My cousin was diagnosed with dystonia, what is this? A: Dystonia is a disorder of involuntary muscle contractions that may ...