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Thalassemia

What is thalassemia?

Key points

  1. Thalassemia is an inherited blood disorder in which the body makes an abnormal form of hemoglobin.
  2. If both of your parents are carriers of thalassemia, you have a greater chance of inheriting a more serious form of the disease.
  3. The three main forms of thalassemia are alpha thalassemia, beta thalassemia, and thalassemia minor.

Thalassemia is an inherited blood disorder in which the body makes an abnormal form of hemoglobin. Hemoglobin is the protein molecule in red blood cells that carries oxygen.

The disorder results in excessive destruction of red blood cells, which leads to anemia. Anemia is a condition in which your body doesn’t have enough normal, healthy red blood cells.

Thalassemia is inherited, meaning that at least one of your parents must be a carrier of the disease. It’s caused by either a genetic mutation or a deletion of certain key gene fragments.

Thalassemia minor is a less serious form of the disorder. There are two main forms of thalassemia that are more serious. In alpha thalassemia, at least one of the alpha globin genes has a mutation or abnormality. In beta thalassemia, the beta globin genes are affected.

Each of these forms of thalassemia has different subtypes. The exact form you have will affect the severity of your symptoms and your outlook.

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Symptoms

What are the symptoms of thalassemia?

The symptoms of thalassemia can vary. Some of the most common ones include:

Not everyone has visible symptoms of thalassemia. Signs of the disorder also tend to show up later in childhood or adolescence.

Causes

What causes thalassemia?

Thalassemia occurs when there’s an abnormality or mutation in one of the genes involved in hemoglobin production. You inherit this genetic defect from your parents.

If only one of your parents is a carrier for thalassemia, you may develop a form of the disease known as thalassemia minor. If this occurs, you probably won’t have symptoms, but you’ll be a carrier of the disease. Some people with thalassemia minor do develop minor symptoms.

If both of your parents are carriers of thalassemia, you have a greater chance of inheriting a more serious form of the disease.

According to the Centers for Disease Control and Prevention (CDC), thalassemia is most common in people from Asia, the Middle East, Africa, and Mediterranean countries such as Greece and Turkey.

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Types

What are the different types of thalassemia?

There are three main types of thalassemia (and four subtypes):

  • beta thalassemia, which includes the subtypes major and intermedia
  • alpha thalassemia, which include the subtypes hemoglobin H and hydrops fetalis
  • thalassemia minor

All of these types and subtypes vary in symptoms and severity. The onset may also vary slightly.

Beta thalassemia

Beta thalassemia occurs when your body can’t produce beta globin. Two genes, one from each parent, are inherited to make beta globin. This type of thalassemia comes in two serious subtypes: thalassemia major (Cooley’s anemia) and thalassemia intermedia.

Thalassemia major is the most severe form of beta thalassemia. It develops when beta globin genes are missing. The symptoms of thalassemia major generally appear before a child’s second birthday. The severe anemia related to this condition can be life-threatening. Other signs and symptoms include:

This form of thalassemia is usually so severe that it requires regular blood transfusions.

Thalassemia intermedia is a less severe form. It develops because of alterations in both beta globin genes. People with thalassemia intermedia don’t need blood transfusions.

Alpha thalassemia

Alpha thalassemia occurs when the body can’t make alpha globin. In order to make alpha globin, you need to have four genes, two from each parent.

This type of thalassemia also has two serious types: hemoglobin H disease and hydrops fetalis.

Hemoglobin H develops as when a person is missing three alpha globin genes or experiences changes in these genes. This disease can lead to bone issues. The cheeks, forehead, and jaw may all overgrow. Additionally, hemoglobin H disease can cause:

Hydrops fetalis is an extremely severe form of thalassemia that occurs before birth. Most individuals with this condition are either stillborn or die shortly after being born. This condition develops when all four alpha globin genes are altered or missing.

Thalassemia minor

People with thalassemia minor don’t usually have any symptoms. If they do, it’s likely to be minor anemia. The condition is classified as either alpha or beta thalassemia minor. In alpha minor cases, two genes are missing. In beta minor, one gene is missing.

The lack of visible symptoms can make thalassemia minor difficult to detect. It’s important to get tested if one of your parents or a relative has some form of the disease.

Diagnosis

How is thalassemia diagnosed?

If your doctor is trying to diagnose thalassemia, they’ll likely take a blood sample. They’ll send this sample to a lab to be tested for anemia and abnormal hemoglobin. A lab technician will also look at the blood under a microscope to see if the red blood cells are oddly shaped. Abnormally shaped red blood cells are a sign of thalassemia. The lab technician may also perform a test known as hemoglobin electrophoresis. This test separates out the different molecules in the red blood cells, allowing them to identify the abnormal type.

Depending on the type and severity of the thalassemia, a physical examination might also help your doctor make a diagnosis. For example, a severely enlarged spleen might suggest to your doctor that you have hemoglobin H disease.

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Treatment

What are the treatment options for thalassemia?

The treatment for thalassemia depends on the type and severity of disease involved. Your doctor will give you a course of treatment that will work best for your particular case.

Some of the treatments include:

Your doctor may instruct you not to take vitamins or supplements containing iron. This is especially true if you need blood transfusions. People who receive blood transfusions receive extra iron that the body can’t easily get rid of. Iron can build up in tissues, which can be potentially fatal.

If you’re receiving a blood transfusion, you may also need chelation therapy. This generally involves receiving an injection of a chemical that binds with iron and other heavy metals. This helps remove extra iron from your body.

Learn more: Transfusion therapy »

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In pregnancy

How does thalassemia affect pregnancy?

Thalassemia also brings up different concerns related to pregnancy. The disorder affects reproductive organ development. Because of this, women with thalassemia may encounter fertility difficulties.

To ensure the health of both you and your baby, it’s important to plan ahead of time as much as possible. If you want to have a baby, discuss this with your doctor to make sure that you’re in the best health possible. Your iron levels will need to be carefully monitored. Preexisting issues with major organs are also considered.

Pregnancy carries the following risk factors in women with thalassemia:

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Outlook

What is the long-term outlook for thalassemia?

If you have thalassemia, your outlook depends on the type of the disease. People who have mild or minor forms of thalassemia can typically lead normal lives.

In severe cases, heart failure is a possibility.

Your doctor can give you more information about your outlook. They will also explain how your treatments can help improve your life or increase your lifespan.

Managing thalassemia

How do you manage thalassemia?

Since thalassemia is a genetic disorder, there’s no way to prevent it. However, there are ways you can manage the disease to help prevent complications. In addition to hepatitis vaccines and ongoing medical care, diet and exercise may also be helpful.

A low-fat, plant-based diet is the best choice for most people, including those with thalassemia. However, you may need to limit iron-rich foods if you already have high iron levels in your blood. Fish and meats are rich in iron, so you may need to limit these in your diet. You may also consider avoiding fortified cereals, breads, and juices. They contain high iron levels, too. Be sure to discuss any dietary changes with your doctor ahead of time.

You may ask your doctor for tips on exercising if you’re not currently physically active. Moderate-intensity workouts are best since heavy exercise can make your symptoms worse. Walking and bike riding are examples of moderate-intensity workouts. Swimming and yoga are other options, and they’re also good for your joints. The key is to find something you enjoy and keep moving.

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