Benign fasciculation syndrome or BFS causes involuntary twitches, spasms, subjective weakness, cramps, tingling, or numbness in at least one muscle. According to the American Academy of Neurology, benign fasciculations are common and occur in roughly 70% of healthy individuals; in rare instances, a serious neuromuscular disorder is to blame. Stress and anxiety can exacerbate BFS, especially in people working in the medical field. Most people experience twitches in an eyelid or random muscle spasms at some point, but doctors diagnose benign fasciculation syndrome when such symptoms are recurring and negatively impact daily life.
BFS symptoms differ among affected individuals. Persistent twitching in one or more muscles is the most common symptom. Calves and thigh twitches are most common, and eyelids and arms can host involuntary twitches as well, but even the tongue can experience involuntary movement. Fasciculations may appear randomly and jump from one muscle group to another, or one muscle can be symptomatic for an extended period.
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