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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.
According to MayoClinic.com, thyroid problems may cause involuntary muscle spasms. Thyroid issues are most likely the cause of muscle spasms occurring around the mouth, but involuntary muscle spasms may also occur in the hands, arms and throat.pilepsy. Epilepsy is a cause of both major and minor involuntary muscle spasms. While most people associate epilepsy with major seizures, small muscle twitches may be the only outward symptom of the disease, according to MayoClinic.com.