These fluttering sensations are the brain’s reaction to certain emotions, which can be amplified or soothed by the gut’s own “bugs.” Wei-Li Wu, a neurobiologist at National Cheng Kung University, ...

Flutter valves are devices that can clear excess secretions from the airways. A person with chronic obstructive pulmonary disease (COPD) may benefit from using a Flutter valve to help manage symptoms.

It's a familiar feeling: Before a test, a first date, or a public speaking engagement, your stomach starts to "flutter" as if butterflies were flying around inside your gut. Stomach sensations are a ...