Deficiency Diseases [Disease/Finding] Magnesium Deficiency [Disease/Finding] N0000001921 Deficiency, Magnesium C4020 Magnesium Deficiency C0024473 Magnesium Deficiency D008275 A nutritional condition produced by a deficiency of magnesium in the diet, characterized by anorexia, nausea, vomiting, lethargy, and weakness. Symptoms are paresthesias, muscle cramps, irritability, decreased attention span, and mental confusion, possibly requiring months to appear. Deficiency of body magnesium can exist even when serum values are normal. In addition, magnesium deficiency may be organ-selective, since certain tissues become deficient before others. (Harrison's Principles of Internal Medicine, 12th ed, p1936) 238118002 M0012886 1024574