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.
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).
Metabolism refers to all the physical and chemical processes in the body that convert or use energy, such as:BreathingCirculating bloodControlling bo...Read Article Now Book Mark Article
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
Diabetes is a long-term (chronic) disease in which the body cannot regulate the amount of sugar in the blood.Read Article Now Book Mark Article
- 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
Malabsorption involves problems with the body's ability to take in (absorb) nutrients from food.Read Article Now Book Mark Article
- Medicines including amphotericin, antibodies targeting the epidermal growth factor (EGF) receptor, cisplatin, cyclosporine, diuretics, proton pump inhibitors, tacrolimus and aminoglycoside antibiotics
- Pancreatitis (swelling and inflammation of the pancreas)
- Excessive sweating
Common symptoms include:
- Abnormal eye movements (nystagmus)
- Muscle spasms or cramps
- Muscle weakness
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).
An electrocardiogram (ECG) is a test that records the electrical activity of the heart.Read Article Now Book Mark Article
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).
A serum magnesium test measures the level of magnesium in the blood.Read Article Now Book Mark Article
Other blood and urine tests that may be done include:
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
Outcome depends on the condition that is causing the problem.
Untreated, this condition can lead to:
- Cardiac arrest
- Respiratory arrest
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.
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.
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.
Chonchol M, Smogorzewski MJ, Stubbs JR, Yu ASL. Disorders of calcium, magnesium, and phosphate balance. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 18.
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.