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Megaloblastic Anemia in Children

What is megaloblastic anemia?

Anemia is a problem in which there are not enough red blood cells or hemoglobin. Hemoglobin is the part of red blood cells that carries oxygen throughout the body. In megaloblastic anemia, the bone marrow, where the cells are formed, makes fewer cells. And the cells that are formed don’t live as long as normal. The red blood cells are:

  • Too large
  • Not fully developed
  • Abnormally shaped

What causes megaloblastic anemia?

There are many causes of megaloblastic anemia. The most common cause in children is lack of folic acid or vitamin B12. Other causes  include:

  • Digestive diseases. These include celiac disease, chronic infectious enteritis, and enteroenteric fistulas. Pernicious anemia is a type of megaloblastic anemia. It’s caused when the body can't absorb vitamin B12. A substance called intrinsic factor is normally made in the stomach.This substance helps the body absorb B12. A person with pernicious anemia does not have enough of this substance.
  • Inherited congenital folate malabsorption. A genetic problem in which infants can’t absorb folic acid.
  • Medicines. Certain medicines, like those that prevent seizures, can interfere with the absorption of folic acid.

What are the symptoms of megaloblastic anemia?

These are some of the symptoms of megaloblastic anemia:

  • Pale or yellow skin
  • Fast heart beat
  • Shortness of breath
  • Lack of energy, feeling tired
  • Decreased appetite
  • Irritability or fussiness
  • Hair color changes
  • Stomach upsets, nausea, diarrhea, gas, constipation
  • Trouble walking
  • Numbness or tingling in hands and feet
  • Smooth and sore tongue
  • Weak muscles

The symptoms of megaloblastic anemia may look like other conditions or medical problems. Always check with your child's doctor for a diagnosis.

How is megaloblastic anemia diagnosed?

Your doctor may suspect megaloblastic anemia based on your child's medical history and physical exam. Blood tests include:

  • Hemoglobin and hematocrit. This is often the first screening test for anemia in children. It measures the amount of hemoglobin and red blood cells in the blood.
  • Complete blood count, or CBC.  A complete blood count checks the red blood cells, white blood cells, blood clotting cells (platelets), and sometimes, young red blood cells (reticulocytes). It includes hemoglobin and hematocrit and more details about the red blood cells.
  • Peripheral smear. A small sample of blood is examined under a microscope. Blood cells are checked to see if they look normal or not.
  • Other blood tests. For example, bilirubin or other liver tests.

A bone marrow aspiration and/or biopsy may be done to examine the number, size, and maturity of blood cells and/or abnormal cells.

A barium study or other imaging tests of the digestive system may also be done.

How is megaloblastic anemia treated?

Your child’s healthcare provider will figure out the best treatment based on:

  • How old your child is
  • His or her overall health and medical history
  • How sick he or she is
  • How well your child can handle specific medications, procedures, or therapies
  • How long the condition is expected to last
  • Your opinion or preference

Your child's health care provider may refer you to a hematologist. This is an expert in blood disorders. If the anemia is caused by a digestive tract problem, it may need to be treated first. Your child's provider may also refer you to a gastroenterologist for this reason. He or she is an expert in digestive system problems. 

Most children with megaloblastic anemia are given B-12 or folic acid supplements. Vitamin B-12 supplements are best absorbed when given by injection.  Folic acid supplements are given by mouth.

Foods that have natural folate include:

  • Oranges, orange juice
  • Dark green and leafy vegetables
  • Liver
  • Barley
  • Sprouts
  • Wheat germ
  • Beans, peas, lentils
  • Peanuts

Cereals, breads, pastas, and rice are fortified with man-made folic acid.

Meat and dairy products have the most vitamin B-12.

What are the complications of megaloblastic anemia?

In general, anemia may cause:

  • Problems with growth and development
  • An enlarged heart, heart failure

Megaloblastic anemia can also cause problems with the nervous system. 

When should I call my child's healthcare provider?

Call your child's healthcare provider if your child has decreased energy, increased tiredness, or other symptoms of anemia.

Key points about megaloblastic anemia in children

  • In megaloblastic anemia, there is a decrease in red blood cells. The cells are too large, not fully developed, and abnormally shaped.
  • Having too little of the vitamins folic acid or B-12 are common causes of megaloblastic anemia.
  • The symptoms of megaloblastic anemia are like other types of anemia (such as, tiredness and pale skin), and there are also nervous system symptoms.
  • Megaloblastic anemia from vitamin deficiencies is treated with folate or B-12 supplements and eating more foods with these vitamins. 

Next steps

Tips to help you get the most from a visit to your child’s healthcare provider:
  • Before your visit, write down questions you want answered.
  • At the visit, write down the names of new medicines, treatments, or tests, and any new instructions your provider gives you for your child.
  • If your child has a follow-up appointment, write down the date, time, and purpose for that visit.
  • Know how you can contact your child’s provider after office hours. This is important if your child becomes ill and you have questions or need advice.
Megaloblastic Anemia in Children - WellSpan Health

Online Medical Reviewer: Freeborn, Donna, PhD, CNM, FNP
Online Medical Reviewer: Holloway, Beth, RN, M.Ed.
Last Review Date: 2015-02-18T00:00:00
Last Modified Date: 2015-11-18T00:00:00
Published Date: 2015-11-18T00:00:00
Last Review Date: 2007-03-30T00:00:00
© 2016 WellSpan Health. All Rights Reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

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