Thalassemia major
Thalassemia major
Also known as:Transfusion-dependent thalassemia; Cooley's anemia; China Second Rare Disease Catalog item 78
Thalassemia major is a severe inherited globin production disorder that causes serious anemia in infancy or early childhood and often requires regular transfusions, iron chelation, and lifelong specialist follow-up.
Start Here
A quick guide to the next step: which department to start with, what to prepare, and what to ask.
Severe microcytic anemia in a baby or child, jaundice, enlarged spleen, poor growth, or prenatal/family thalassemia risk should be assessed by pediatric hematology, hematology, and genetics.
Globin gene variants reduce hemoglobin production, so red blood cells cannot carry oxygen normally. Severe disease often appears from several months to age 2 with pallor, fatigue, poor growth, jaundice, enlarged liver or spleen, and bone changes.
Core care includes regular transfusion, iron chelation, and monitoring of the heart, liver, endocrine system, and infections. Some patients can be evaluated for stem cell transplant or gene therapy.
It is inherited, usually autosomal recessive. Parents may be healthy carriers, so patients, parents, and relatives planning pregnancy should ask about genetic testing and reproductive risk.
Carriers and milder disease can look like iron deficiency. Repeated iron treatment without hemoglobin analysis and genetic testing can delay correct diagnosis and family counseling.
This page helps patients and families organize care leads. It does not replace a clinician’s diagnosis or treatment plan. For testing, medication, referrals, emergency care, and support applications, follow qualified clinicians, medical institutions, support organizations, and official sources.
Diagnosis Path
Organized around the practical patient journey: identify clues, avoid common delays, then prepare for care.
When to Suspect It
- Infant or child with pallor, poor feeding, slow weight gain, fatigue, shortness of breath, and microcytic hypochromic anemia.
- Jaundice, dark urine, enlarged liver or spleen, bone changes, delayed growth, or delayed puberty.
- Parents from high-prevalence regions, abnormal prenatal screening, or family history of thalassemia carrier status, severe childhood anemia, or regular transfusions.
Common Wrong Turns
- Repeatedly treating as iron deficiency without ferritin, hemoglobin electrophoresis/HPLC, and globin gene testing.
- Giving transfusions without a structured chelation plan, allowing heart, liver, and endocrine iron overload.
- Not testing parents and siblings, leaving future pregnancy and relative reproductive risk unrecognized.
Departments to Start With
- Pediatric hematology
- Hematology thalassemia clinic
- Medical genetics/genetic counseling
- Prenatal diagnosis center for pregnancy planning
Before the Visit
- Bring birth history, feeding and growth records, anemia timeline, transfusion history, medicines, and family ancestry.
- Bring CBC, reticulocytes, bilirubin, ferritin, hemoglobin electrophoresis/HPLC, and genetic testing.
- Bring cardiac and liver MRI iron measurements, ultrasound, endocrine tests, bone density, and infection screening when available.
Tests to Ask About
- Whether HBB, HBA1/HBA2, or other globin gene testing is needed to confirm type and family risk.
- Target hemoglobin, transfusion interval, red cell antibody screening, and when to start chelation.
- How iron overload will be monitored with ferritin, liver iron, cardiac T2* MRI, ECG/echo, liver tests, and endocrine labs.
Questions for the Doctor
- Is this transfusion-dependent disease, and what are the transfusion and chelation targets?
- Do I have iron overload now, and how will chelation choice and side effects be monitored?
- Am I a candidate for stem cell transplant, gene therapy, or trials, and which relatives need testing?
Basic Information
Medical Notes
More complete medical explanations are kept here for discussion with clinicians.
Symptoms
Thalassemia major often causes severe anemia in infancy or early childhood, with pallor, fatigue, poor feeding, poor growth, jaundice, dark urine, enlarged liver or spleen, and recurrent infections. Long-term anemia and marrow expansion can cause bone and facial changes, and puberty may be delayed.
Regular transfusions can cause iron overload. Iron can injure the heart, liver, and endocrine organs, causing arrhythmia, heart failure, liver fibrosis, diabetes, thyroid disease, or delayed sexual development.
Diagnosis
Diagnosis combines microcytic hypochromic anemia on CBC, reticulocytes, hemolysis markers, hemoglobin electrophoresis or HPLC, iron studies, and family assessment. Genetic testing confirms alpha or beta globin variants and helps distinguish carrier, intermedia, and major disease.
Clinicians distinguish thalassemia from iron deficiency anemia, anemia of chronic disease, other hemolytic anemia, and marrow disorders. Once confirmed, baseline transfusion planning, antibody screening, iron burden, and organ function are needed.
Treatment
Transfusion-dependent patients usually need regular red cell transfusions to maintain hemoglobin, support growth, and suppress excessive marrow activity. Long-term transfusion must be paired with iron chelation, such as deferoxamine, deferasirox, or deferiprone, chosen by specialists based on age, iron burden, and adverse effects.
Some patients may be evaluated for hematopoietic stem cell transplant, and in selected settings gene therapy or clinical trials may be relevant. Care also includes vaccination, infection prevention, folate when appropriate, nutrition, growth and puberty care, heart, liver, endocrine, and bone monitoring.
Long-term Care
Follow-up tracks transfusion reactions, red cell antibodies, ferritin, liver and cardiac MRI iron, heart, liver, endocrine status, bone density, infection screening, and quality of life. Regular transfusion and consistent chelation are central to organ protection.
Patients should keep complete transfusion and chelation records, avoid iron supplements unless prescribed, and contact hematology for fever, transfusion reactions, or chelation side effects.
Fertility and Family
Thalassemia is inherited. Parents, siblings, and reproductive partners should be offered carrier testing and genetic counseling; pregnancy planning can include prenatal diagnosis or preimplantation genetic testing where available.
When to Seek Urgent Care
Urgent care is needed for marked shortness of breath, chest pain or palpitations, fainting, persistent high fever, severe pallor or weakness, very dark urine, fever, rash, or back pain after transfusion, abdominal pain near the spleen, or signs of infection.
Prognosis
Consistent transfusion and chelation greatly improve survival and quality of life; heart, liver, endocrine iron overload and infection remain key long-term risks.