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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.
Chronic or excessive vomiting and diarrhea may also result in magnesium depletion. Signs of magnesium deficiency include confusion, disorientation, loss of appetite, depression, muscle contractions and cramps, tingling, numbness, abnormal heart rhythms, coronary spasm, and seizures. Next: Reasons for Taking Magnesium Supplements.