What are muscle spasms?

I didn't think I had these but now I think I have for a long time......

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I AM HAVING A VERY BAD TIME WITH THEM AND THEY MAKE ME SHOUT OUT AND I COULD DROP TO THE FLOOR . XX

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Thank you Chris.

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I get them very badly, there are a lot of articles if you google fibromyalgia and look for myofascial pain, there are articles which explain about lactic acid, etc. and why the muscles cramp and crate a burning pain. It is excrutiating isn't it! Sue