Health Tip: Why Do My Muscles Twitch?

Some possible causes

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 (HealthDay News) -- Muscle twitches, especially involving the eyelids, calf or thumb—are fairly common.

Rarely, they can be a sign of a nervous system disorder, the U.S. National Library of Medicine says. Signals of a serious muscle problem include a change in muscle sensation, size, and a feeling of muscle weakness.

On the other hand, most muscle twitches aren't anything to worry about and only last for a few days or less. The NLM offers this list of common causes:

  • Having a dietary deficiency
  • Getting too much caffeine
  • Taking certain medications, such as steroids, estrogen hormones or diuretics
  • Exercising
  • Having anxiety or stress

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