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Muscles are made up of fibers that your nerves control. Muscle twitching is caused by minor muscle contraction in the area, or uncontrollable twitching of a muscle group that is served by a single motor nerve fiber. Stimulation or damage to a nerve may cause your muscle fibers to twitch. Most muscle twitches are minor and aren’t usually a cause for concern. Some are common and normal. Others are signs of a nervous system disorder.
These may include:
Nervous system conditions that can cause muscle twitching include:
Call your health care provider if you have long-term or persistent muscle twitches or if twitching occurs with weakness or loss of muscle.