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Photo Credit shih-wei/iStock/Getty Images. Magnesium is a naturally occurring element that people need as a key nutrient. The human body relies on magnesium for various purposes, and people who don't have enough can suffer various symptoms, through dry, itchy skin is not considered one of them.
Here are some of the problems that can be caused by a lack of magnesium. Nausea and vomiting. Early signs of magnesium deficiency can include gastrointestinal disturbances. This can range from a loss of appetite to nausea and vomiting.