Effects to the body if the element is present in low quantities or absent

Lack of magnesium (deficiency) is rare. The symptoms include:

• Hyperexcitability

• Muscle weakness

• Sleepiness

Deficiency of magnesium can occur in people who abuse alcohol or in those who absorb less magnesium due to:

• Burns

• Certain medications

• Low blood levels of calcium

• Problems absorbing nutrients from the intestinal tract (malabsorption)

• Surgery

Symptoms due to a lack of magnesium have three categories.

Early symptoms:

• Anorexia

• Apathy

• Confusion

• Fatigue

• Insomnia

• Irritability

• Muscle twitching

• Poor memory

• Reduced ability to learn

Moderate deficiency symptoms:

• Heart (cardiovascular) changes

• Rapid heartbeat

Severe deficiency:

• Continued muscle contraction

• Delirium

• Numbness

• Seeing or hearing things that aren't there (hallucinations)

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