what causes persistant muscle twitching?

Question:

my boyfriend's shoulder muscle has been consistently twitching for about two weeks now, he works out, did he hurt himself, is it serious?

Answers:
The precise cause of the twitching is unknown, and, in fact, it's not known if it's a disease of the motor nerves, the muscles, or the neuromuscular junction. However, anxiety is cleary a major contributing factor in many cases, and a high level of psychological stress appears to be a factor in others. Another factor that seems to be common in many cases is a history of regular strenuous exercise. Attention deficit disorder or a related disorder may be a contributing factor, and people with essential tremor appear to have a greater than normal likelihood of developing BFS. In addition, there are likely other genetic and environmental factors that make the patient more susceptible to Twitching.

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what causes persistant muscle twitching?

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