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Magnesium deficiency
     
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Magnesium deficiency

Low blood magnesium; Magnesium - low; Hypomagnesemia

 

Magnesium deficiency is a condition in which the amount of magnesium in the blood is lower than normal. The medical name of this condition is hypomagnesemia.

Causes

 

Every organ in the body, especially the heart, muscles, and kidneys, needs the mineral magnesium. It also contributes to the makeup of teeth and bones. Magnesium is needed for many functions in the body. This includes the physical and chemical processes in the body that convert or use energy (metabolism).

When the level of magnesium in the body drops below normal, symptoms develop due to low magnesium.

Common causes of low magnesium include:

  • Alcohol use
  • Burns that affect a large area of the body
  • Chronic diarrhea
  • Excessive urination (polyuria), such as in uncontrolled diabetes and during recovery from acute kidney failure
  • Hyperaldosteronism (disorder in which the adrenal gland releases too much of the hormone aldosterone into the blood)
  • Kidney tubule disorders
  • Malabsorption syndromes, such as celiac disease and inflammatory bowel disease
  • Malnutrition
  • Medicines including amphotericin, cisplatin, cyclosporine, diuretics, proton pump inhibitors, and aminoglycoside antibiotics
  • Pancreatitis (swelling and inflammation of the pancreas)
  • Excessive sweating

 

Symptoms

 

Common symptoms include:

  • Abnormal eye movements (nystagmus)
  • Convulsions
  • Fatigue
  • Muscle spasms or cramps
  • Muscle weakness
  • Numbness

 

Exams and Tests

 

Your health care provider will do a physical exam and ask about your symptoms.

Tests that may be ordered include an electrocardiogram (ECG).

A blood test will be ordered to check your magnesium level. Normal range is 1.3 to 2.1 mEq/L (0.65 to 1.05 mmol/L). 

Other blood and urine tests that may be done include:

  • Calcium blood test 
  • Comprehensive metabolic panel
  • Potassium blood test
  • Urine magnesium test

 

Treatment

 

Treatment depends on the type of low magnesium problem and may include:

  • Fluids given through a vein (IV)
  • Magnesium by mouth or through a vein
  • Medicines to relieve symptoms

 

Outlook (Prognosis)

 

Outcome depends on the condition that is causing the problem.

 

Possible Complications

 

Untreated, this condition can lead to:

  • Cardiac arrest
  • Respiratory arrest
  • Death

 

When to Contact a Medical Professional

 

When your body's magnesium level drops too much, it can be a life-threatening emergency. Call your provider right away if you have symptoms of this condition.

 

Prevention

 

Treating the condition that is causing low magnesium can help.

If you play sports or do other vigorous activity, drink fluids such as sports drinks. They contain electrolytes to keep your magnesium level in a healthy range.

 

 

References

Pfennig CL, Slovis CM. Electrolyte disorders. In: Hockberger RS, Walls RM, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier Saunders; 2018:chap 117.

Smogorzewski MJ, Stubbs JR, Yu ASL. Disorders of calcium, magnesium, and phosphate balance. In: Skorecki K, Chertow GM, Marsden PA, Taal MW, Yu ASL, eds. Brenner and Rector's The Kidney. 10th ed. Philadelphia, PA: Elsevier; 2016:chap 19.

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              Review Date: 4/8/2019

              Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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