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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.
Medical Definition of Magnesium deficiency. Magnesium deficiency: Can occur due to inadequate intake or impaired intestinal absorption of magnesium. Low magnesium (hypomagnesemia) is often associated with low calcium (hypocalcemia) and low potassium (hypokalemia). Deficiency of magnesium causes increased irritability of the nervous system with tetany (spasms of the hands and feet, muscular twitching and cramps, spasm of the larynx, etc.).