Alien hand syndrome (AHS) is when a single limb, usually a hand but sometimes a leg, moves involuntarily. It can signify a serious underlying issue, such as stroke or neurodegenerative disease. Share ...

Add Yahoo as a preferred source to see more of our stories on Google. Alien (left) and elderly woman holding her hand (right) ET, phone 911. Imagine sitting at home on your couch when one of your ...

AHS is often caused by brain injury or neurodegenerative illnesses, but there is not enough research to determine any consistent cause or why it occurs. “Alien hand is little investigated because it ...