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Why do people sometimes keep the arm muscles twitch?

Liu's future2010-04-17 21:11:01 +0000 #1
Just a simple twitch, not pain. In the deltoid muscle here, not beating regularly. Who knows? Tell me, thank you!
wq642709882010-04-17 21:26:04 +0000 #2
You are under normal conditions or after exercise? If after exercise you build muscle fibers in the congestion, so beat! Normally, only arterial beat, not too obvious!

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