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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.
Magnesium deficiency can cause loss of appetite, nausea and vomiting, fatigue, and weakness. In more severe cases, it can lead to numbness, muscle cramps, seizures, abnormal heart rhythms, personality changes, or low potassium or calcium levels.he organization says symptoms of severe B12 deficiency include numbness in the legs, hands, or feet; problems with walking and balance; anemia; fatigue; weakness; a swollen, inflamed tongue; memory loss; paranoia; and hallucinations.