What should you know about thalassaemia in pregnancy?

Thalassaemia in pregnancy needs early review because the condition can affect haemoglobin levels and may be inherited by the baby. The plan depends on whether you have thalassaemia trait, which is often mild, or a form that causes more substantial anaemia and may have required treatment before pregnancy. Your maternity team can review previous records, arrange a blood test, and decide whether a haematology specialist and fetal medicine team should be involved. Do not start iron supplements simply because you feel tired: iron deficiency and thalassaemia-related anaemia are different problems, and treatment should follow testing.

Thalassaemia is an inherited condition affecting haemoglobin, the part of red blood cells that carries oxygen. Pregnancy naturally changes blood volume, so anaemia may become more noticeable. Fatigue, breathlessness, dizziness, or pale skin can have several causes; these symptoms do not by themselves show that thalassaemia is responsible. A person with thalassaemia trait may have small red blood cells without severe illness, while a person with a more significant form may need an individual plan for blood counts, medicines, transfusions, or iron balance.

The baby’s inherited risk depends on the specific thalassaemia change you carry and whether the other biological parent carries one too. Partner testing and genetic counselling can explain the possible combinations. This is different from saying that a pregnancy symptom is likely to be thalassaemia.

Tell your obstetrician or midwife about any known thalassaemia diagnosis, trait result, transfusions, iron treatment, heart or liver concerns, and medicines or supplements. Arrange care early, even if you feel well. Ask whether your partner needs a blood test and whether genetic counselling or prenatal testing is appropriate for your situation. Keep antenatal appointments so your haemoglobin and general health can be followed; the team may also discuss scans and delivery planning according to your condition.

Eat regularly and take only supplements recommended for your pregnancy and blood results. Seek advice before using an iron product, changing prescribed treatment, or stopping a medicine. More background is available in the pages on Thalassaemia, Anaemia, Blood Test, and Premarital Screening.

Contact your maternity team promptly if tiredness is worsening, you develop new breathlessness, repeated dizziness, palpitations, fainting, or reduced ability to carry out usual activities. These symptoms can reflect significant anaemia or another pregnancy problem and need assessment rather than self-treatment. Seek emergency help for severe breathing difficulty, chest pain, collapse, confusion, or heavy vaginal bleeding.

If you have thalassaemia and develop fever, unusual weakness, yellowing of the eyes, severe abdominal pain, or symptoms after a transfusion, use the urgent contact plan given by your specialist or maternity unit.

Ask: Do I have thalassaemia trait or a form that needs specialist monitoring? Which blood results confirm this? Should my partner be tested? Do I need genetic counselling? Which supplements and medicines are suitable for me? What symptoms should make me call the maternity unit, and who should I contact outside clinic hours?