When the diet is lacking in magnesium, it causes deficiency of this mineral. It can lead to many health problems. Magnesium plays an important role in maintaining our metabolism. It helps in supplying calcium to body cells. Magnesium deficiency causes diabtes, hypertension and heart disease. People who have this deficiency are likely to suffer from osteoporosis. Knowing the symptoms of magnesium deficiency helps in early recognition and timely treatment of this problem. The deficiency is cured by eating magnesium rich foods and supplements. The main symptoms of this deficiency are muscle cramps, fatigue, nausea and vomiting. You can have weakness, memory problems and insomnia. Following are 16 magnesium deficiency symptoms.