Megaloblastic anemia is a type of anemia characterized by very large red blood cells. In addition to the cells being large, the inner contents of each cell are not completely developed. This malformation causes the bone marrow to produce fewer cells, and sometimes the cells die earlier than the 120-day life expectancy. Instead of being round or disk-shaped, the red blood cells can be oval.
There are many causes of megaloblastic anemia, but the most common source in children occurs from a vitamin deficiency of folic acid or vitamin B12. Other sources of megaloblastic anemia include the following:
Digestive diseases. Certain diseases of the lower digestive tract can lead to megaloblastic anemia. These include celiac disease, chronic infectious enteritis, and enteroenteric fistulas. Pernicious anemia is a type of megaloblastic anemia caused by an inability to absorb vitamin B12 due to a lack of intrinsic factor in gastric (stomach) secretions. Intrinsic factor enables the absorption of vitamin B12.
Malabsorption. Inherited congenital folate malabsorption, a genetic problem in which infants cannot absorb folic acid in their intestines, can lead to megaloblastic anemia. This requires early intensive treatment to prevent long-term problems, such as intellectual disability.
Medication-induced folic acid deficiency. Certain medications, specifically ones that prevent seizures, such as phenytoin, primidone, and phenobarbital, can impair the absorption of folic acid. The deficiency can usually be treated with a dietary supplement.
Folic acid deficiency. Folic acid is a B vitamin required for the production of normal red blood cells. Folate, the naturally occurring form, is present in foods, such as green vegetables, liver, and yeast. Folic acid is produced synthetically and added to many food items, including breads and cereals.
The following are the most common symptoms of megaloblastic anemia. However, each child may experience symptoms differently. Symptoms may include:
Abnormal paleness or lack of color of the skin
Lack of energy or tiring easily (fatigue)
Numbness or tingling in hands and feet
Smooth and tender tongue
The symptoms of megaloblastic anemia may resemble other blood conditions or medical problems. Always consult your child's doctor for a diagnosis.
Megaloblastic anemia may be suspected from general findings from a complete medical history and physical examination of your child. In addition, several blood tests can be performed to confirm the diagnosis. If the megaloblastic anemia is thought to be caused by a problem in the digestive tract, a barium study of the digestive system may be performed, and occasionally an endoscopy may need to be performed.
Specific treatment for megaloblastic anemia will be determined by your child's doctor based on:
Your child's age, overall health, and medical history
Extent of the anemia
Cause of anemia
Your child's tolerance for specific medications, procedures, or therapies
Expectations for the course of the anemia
Your opinion or preference
Treatment for megaloblastic anemia due to a folic acid deficiency usually involves your child taking an oral dietary folic acid supplement for at least two to three months. If the disorder is caused by an absorption problem in the digestive tract, this may need to be treated first. Vitamin B12 supplements are best absorbed when given by injection. Animal proteins are the only food sources of vitamin B12.
Foods that are naturally rich in folate include the following:
Green, leafy vegetables
Chick peas (garbanzo beans)
Foods that are fortified with folic acid include the following:
Foods that are rich in vitamin B12 include the following:
Shellfish and some fish