Benign Fibrillation Syndrome (BFS) is characterized by involuntary muscle twitching in certain areas of the body, but is not associated with muscle weakness or atrophy. People with BMFS usually feel an involuntary muscle twitch in one part of the body, often referred to as a “flutter”. It is common in the face and limbs and occurs at rest. The commonly heard “eyelid flutter” is a manifestation of this fluttering in the face, which usually resolves on its own quickly and does not develop into a serious neurological disorder. The exact cause of benign muscle tremor syndrome is not yet clear, but may be related to emotional anxiety, prolonged exercise, and other factors. If benign muscle tremor does not resolve on its own, it is recommended to seek prompt medical attention and be examined and diagnosed by a doctor in order to avoid adverse effects on the body.