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Toxic symptoms from increased magnesium intake are not common because the body eliminates excess amounts. Magnesium excess almost always occurs only when magnesium is supplemented as a medication.

Magnesium deficiency is rare. The symptoms include muscle weakness, fatigue, hyperexcitability, and sleepiness. Deficiency of magnesium can occur in alcoholics or people whose magnesium absorption is decreased due to surgery, burns or problems with malabsorption (inadequate absorption of nutrients from the intestinal tract). Certain medications or low blood levels of calcium may be associated with magnesium deficiency.

Deficiency symptoms have three categories:

Early symptoms include irritability, anorexia, fatigue, insomnia, and muscle twitching. Other symptoms include poor memory, apathy, confusion, and the reduced ability to learn.
Moderate deficiency symptoms consist of rapid heartbeat and other cardiovascular changes.
Severe deficiency symptoms could lead to tingling, numbness, and a sustained contraction of the muscles, along with hallucinations and delirium.