(Juvenile Pernicious Anemia; Congenital Pernicious Anemia)
Pronounced: Per-nish-us Ah-nee-mee-ah
by Monique Kahn, MS, RD
Anemia is a low level of healthy red blood cells (RBC). RBCs carry oxygen from the lungs to the rest of the body. When red blood cells are low the body does not get enough oxygen. This can cause symptoms such as fatigue, pale skin, or irregular heartbeat.
Pernicious anemia is associated with problems absorbing vitamin B12. This vitamin is needed to make healthy RBCs. Over time the low vitamin B12 levels will reduce the number of new RBCs. The sooner pernicious anemia is treated, the better the outcome.
There are many possible causes of pernicious anemia. These include:
Risk Factors TOP
Pernicious anemia is more common in people over 50 years old, and in those of northern European or Scandinavian descent. Factors that may increase your chance of pernicious anemia include:
Autoimmune disorders, such as:
Pernicious anemia symptoms can vary from person-to-person. They may change or worsen over time.
Pernicious anemia may cause:
Your doctor will ask about your symptoms and medical history. A physical exam will be done.
Blood tests are used to evaluate specific components to determine if there is a deficiency in proteins, vitamins, or building blocks.
Other tests may include:
Talk with your doctor about the best treatment plan for you. Treatment options include the following:
Vitamin B12 Injections
The treatment consists of injections of vitamin B12 into a muscle. These injections are necessary because the intestines cannot absorb enough vitamin B12 without an adequate supply of intrinsic factor from the stomach.
Oral Vitamin B12 Supplement
If you are elderly, your doctor may advise you to take oral B12 supplements alone or in addition to injections of vitamin B12.
Intranasal Vitamin B12 TOP
Your doctor may give you a supplement of vitamin B12 that is sprayed into the nose.
Oral Iron Therapy TOP
This treatment is recommended when an iron deficiency exists. In this case, the doctor will tell you to take iron supplements before treating with vitamin B12.
There are no current guidelines to prevent pernicious anemia.
Family Doctor—American Academy of Family Physicians
National Institutes of Health Office of Dietary Supplements
Public Health Agency of Canada
Beers MH, Berkow R, eds. The Merck Manual of Diagnosis and Therapy. 17th ed. Whitehouse Station, NJ: Merck Research Laboratories; 1999.
Beers MH, Porter RS, Jones TV, eds. The Merck Manual of Diagnosis and Therapy. 18th ed. Whitehouse Station, NJ: Merck Research Laboratories; 2006.
Escott-Stump S. Nutrition and Diagnosis-Related Care. 5th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2002.
Kasper DL, Braunwald E, Fauci AS, Hauser SL, Longo DL, Jameson JL, eds. Harrison’s Principles of Internal Medicine. 16th ed. New York, NY: McGraw-Hill Companies, Inc; 2005.
Mahan LK, Escott-Stump S, eds. Krause’s Food, Nutrition and Diet Therapy. 10th ed. Philadelphia, PA: WB Saunders Company; 2000.
Mahan LK, Escott-Stump S, eds. Krause’s Food, Nutrition and Diet Therapy. 11th ed. Philadelphia, PA: WB Saunders Company; 2003.
Morrison G, Hark L, eds. Medical Nutrition and Disease. 2nd ed. Malden, MA: Blackwell Science; 1999.
Pernicioius anemia. EBSCO DynaMed website. Available at:
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Updated August 9, 2013. Accessed September 4, 2014.
Whitney EN, Rolfes SR. Understanding Nutrition. 8th ed. Belmont, CA: West/Wadsworth; 1999.
Whitney EN, Rolfes SR. Understanding Nutrition. 9th ed. Belmont, CA: West/Wadsworth; 2002.
Last reviewed August 2014 by Marcin Chwistek, MD
Last Updated: 9/30/2013
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