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And then it went away when I started it again. It was better then a drug â¦ and no side affects! (Later, I found out that the sourse cause of the heartburn was a simple vitamine C tablet that I had also been taking.) Just one more thing. John Lee, M.D. also said that magnesium deficiency can cause leg cramps.
Some spasms occur because the nerve that connects to a muscle is irritated. One example is a herniated disk irritates the spinal nerves and causes pain and spasm in the back muscles. Spasms in the calf often occur while kicking during swimming. They can also happen at night when you are in bed.