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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.
Unknown cause (idiopathic leg cramps) In most cases the cause is not known. One theory is that cramps occur when a muscle that is already in a shortened position is stimulated to contract. As the muscle is already shortened, to contract further may cause the muscle to go into spasm.