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Thalassemia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Blood Heart Circulation

Thalassemia

Thalassemias are inherited blood disorders that cause the body to produce fewer healthy red blood cells and less hemoglobin, leading to anemia.

Overview

Thalassemias are inherited blood disorders. If you have one, your body makes fewer healthy red blood cells and less hemoglobin. Hemoglobin is a protein that carries oxygen to the body. That leads to anemia. Thalassemias occur most often among people of Italian, Greek, Middle Eastern, Southern Asian, and African descent.

Thalassemias can be mild or severe. Some people have no symptoms or mild anemia. The most common severe type in the United States is called Cooley's anemia. It usually appears during the first two years of life. People with it may have severe anemia, slowed growth and delayed puberty, and problems with the spleen, liver, heart, or bones.

Diagnosis and Treatment

Doctors diagnose thalassemias using blood tests. Treatments include blood transfusions and treatment to remove excess iron from the body. If you have mild symptoms or no symptoms, you may not need treatment. In some severe cases, you may need a bone marrow transplant.

Frequently Asked Questions

Iron overload is a major concern because regular blood transfusions, a common treatment for severe thalassemia, introduce excess iron into the body. The body cannot naturally remove this excess iron, leading to its accumulation in vital organs like the heart, liver, and endocrine glands. This can cause serious damage, including heart failure, liver cirrhosis, and diabetes. Iron overload is managed through chelation therapy, which involves medications that bind to excess iron and help the body excrete it. Regular monitoring of iron levels is essential.
For mild forms of thalassemia, many people may not require specific treatment, but certain lifestyle and dietary considerations can be helpful. Maintaining a balanced diet rich in fruits, vegetables, and whole grains is generally recommended. However, individuals with thalassemia should be cautious with iron supplements and iron-fortified foods, as they can contribute to iron overload, even in mild cases. It's important to discuss iron intake with a doctor. Regular check-ups are also advised to monitor for any changes in anemia or iron levels.
For severe forms like Cooley's anemia (beta thalassemia major), parents might notice symptoms appearing within the first two years of life. Key signs include severe fatigue, pale skin, poor feeding, frequent infections, slowed growth and development, and jaundice (yellowing of the skin or eyes). As the disease progresses, an enlarged spleen and liver, changes in bone structure (especially in the face), and dark urine may also become apparent. Early diagnosis and treatment are crucial for managing these symptoms.
Thalassemia is an inherited genetic disorder, meaning it is passed down from parents to children. It occurs when a child inherits abnormal hemoglobin genes from one or both parents. If both parents carry a thalassemia trait (meaning they have one abnormal gene but usually no symptoms), there's a 25% chance with each pregnancy that their child will inherit two abnormal genes and develop a severe form of thalassemia. Genetic testing, including carrier screening (blood tests to identify if someone carries a thalassemia gene) and prenatal diagnosis (testing during pregnancy), is available to assess risk and inform family planning decisions.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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