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Iron overload in thalassaemia: how it harms the organs | CION Cancer Clinics
Extra iron is the main long-term risk of regular transfusions in thalassaemia. Each unit of blood adds iron the body cannot remove, and over years it collects in the heart, liver and hormone glands. It causes no early symptoms, so regular blood tests, MRI checks and chelation medicine protect the organs. This page explains where the damage happens and what the reports can and cannot tell you. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Why does iron build up in thalassaemia, and why does it matter?
- Which organs does extra iron harm?
- What do the iron words on the report mean?
- How is iron tracked as your child grows?
- What can a ferritin result not tell you?
- What do families often believe about iron, and what is true?
- Common questions about iron overload in thalassaemia
The short answer
Why does iron build up in thalassaemia, and why does it matter?
Every unit of blood you receive carries iron, and the body has no way to get rid of it. Over years of regular transfusions that iron piles up in the heart, liver and hormone glands, and slowly damages them.
Where the extra iron comes from
Red cells are rich in iron. When a transfused red cell wears out, the body keeps its iron and stores it. Healthy people lose only a little iron each day through the gut and skin. Transfusions bring in far more than that, so the store keeps growing.
It can happen without transfusions too
People with thalassaemia intermedia, or non-transfusion-dependent thalassaemia, may absorb more iron from food than they need. The body reads the low haemoglobin as a signal to take in iron. So iron can build up even in someone who has had few or no transfusions.
Why the damage is easy to miss
Stored iron causes no pain and no early symptoms. By the time the heart or glands show strain, the iron has often been there for years. That is why regular checks matter more than how your child feels on a given day.
Iron build-up is expected with regular transfusions. It is not a sign that anyone has done something wrong.Organ by organ
Which organs does extra iron harm?
Iron does not settle evenly. Each organ fills at its own pace, which is why one test cannot show the whole picture.
The heart
Iron in the heart muscle weakens its pumping and can upset its rhythm. This is the most serious effect, and the one the treating team watches most closely.
Signs that come late
- Breathlessness on light effort
- A racing or uneven heartbeat
- Swollen feet and ankles
The liver
The liver stores most of the body's extra iron. Over time this can cause scarring. Hepatitis B or C picked up from older transfusions adds to the strain.
Hormone glands
The pituitary gland at the base of the brain is sensitive to iron. Damage here can slow growth and delay puberty. The thyroid and parathyroid glands can also slow down.
The pancreas and bones
Iron in the pancreas can lead to diabetes in teenagers and young adults. Thin, weak bones are also common, from hormone changes as much as from iron itself.
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Heart symptoms cannot wait
If a person with thalassaemia becomes breathless at rest, has chest pain, faints, or feels the heart racing or skipping, go to the nearest emergency department today or call 108. Say that they have thalassaemia and receive regular transfusions. Do not wait for the next clinic visit, and carry the latest reports with you.
On your report
What do the iron words on the report mean?
- Serum ferritin
- A blood test that gives a rough idea of how much iron is stored. It is simple and repeated often, but infection and liver problems can push it up.
- Transferrin saturation
- How full the iron-carrying protein in the blood is. A high value means free iron may be reaching the organs.
- MRI T2*
- A special MRI reading that estimates iron in the heart muscle. A lower value means more iron.
- Liver iron concentration (LIC)
- An MRI estimate of iron in the liver. It tracks the total body store better than ferritin alone.
- Chelation
- Medicine that binds extra iron so the body can pass it out in urine or stool.
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Over the years
How is iron tracked as your child grows?
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From the early transfusion years
Ferritin is checked regularly, usually every few months. The team looks at the trend over several tests, not at one result.
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When chelation starts
The haematologist decides when the iron load is high enough to start medicine. Kidney and liver blood tests are done before and during treatment.
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Once your child can lie still for an MRI
MRI of the heart and liver is added, often once a year. It shows where the iron actually sits, which ferritin cannot.
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Through the teenage years
Growth, puberty, blood sugar, thyroid and bone checks join the routine. Hormone problems found early are easier to manage.
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Into adult life
Heart tests, eye and hearing checks and liver scans continue. The plan is adjusted as the iron picture changes.
Being straight with you
What can a ferritin result not tell you?
A single ferritin number cannot tell you whether the heart is safe. It reflects iron stores roughly, and it can rise with a fever, an infection or a liver problem. Some people have a modest ferritin but real iron in the heart.
Why labs and trends matter
Reference ranges differ between laboratories, so compare results from the same lab where you can. One result is always read with symptoms, repeat tests and the MRI picture. A falling trend over months is more useful than any single figure.
Damage can often slow down or improve
With steady chelation, iron in the liver and heart can come down, and heart function can improve. Some hormone damage, once set in, may not reverse. That is why early and steady treatment matters.
Your own picture
This page cannot tell you how much iron your child carries or what the outlook is. Your haematologist reads the reports together and explains what they mean for your family.
Never change or stop chelation on your own because a ferritin result looks better. Ask the treating team first.Commonly believed
What do families often believe about iron, and what is true?
"My child looks well, so the iron is not a problem."
Iron causes no symptoms for years. A child can look and feel well while iron builds in the heart. Regular tests, not appearance, show how much is stored.
"We should stop iron-rich foods like spinach and dates."
Food adds far less iron than transfusions do. Cutting out whole food groups can harm growth. Ask the team about diet, and avoid iron tablets or tonics unless a doctor has prescribed them.
"Fewer transfusions will keep the iron down."
Skipping transfusions lets haemoglobin fall, and the body then absorbs more iron from food while bones and growth suffer. The transfusion plan and chelation work together.
"If ferritin is normal, we can skip the MRI."
Ferritin and heart iron do not always move together. The MRI is the only routine way to see iron in the heart itself, so it still has a place even when ferritin looks fine.
Questions we are asked
Common questions about iron overload in thalassaemia
Does every child on regular transfusions get iron overload?
Almost every child who has regular transfusions builds up extra iron, because each unit adds iron the body cannot remove. How fast it builds depends on how often transfusions are given and how well chelation works. Regular checks show where your child stands.
What ferritin level is dangerous?
There is no single number that is safe or unsafe for everyone. Your haematologist uses ferritin trends, the MRI and your child's age to set a target. Reference ranges differ between laboratories, so ask what your own result means, rather than comparing it with a figure found online.
Can the damage from iron be reversed?
Some of it can. Iron in the heart and liver often comes down with steady chelation, and heart pumping can improve. Damage to hormone glands, such as delayed puberty or diabetes, may be lasting and needs its own treatment. Starting early gives the organs the most protection.
Why does my child need an MRI when the blood test is done?
The blood test gives a rough idea of total stores. It cannot show where the iron sits. An MRI T2* reading looks at the heart muscle directly, and a liver reading measures liver iron. Together they tell the team whether chelation needs a change.
Can people with thalassaemia trait get iron overload?
People with the trait usually do not need transfusions and rarely build up iron from thalassaemia itself. The bigger risk is being given iron tablets for a low haemoglobin that is really due to the trait. Check with a doctor before taking iron if you carry the trait.
Should we avoid vitamin C or tea with meals?
Vitamin C helps the gut absorb iron, and tea can reduce it slightly. Some teams give simple advice around this, and some chelation plans use vitamin C in a specific way. Do not start or stop supplements on your own. Ask your haematologist what suits your child.
Can iron overload affect fertility later?
It can. Iron in the pituitary gland can reduce the hormones that drive puberty and fertility. Many young adults with thalassaemia still have children with specialist help. Bring this up early with the team, so hormone checks start in good time.
How can CION help with iron monitoring?
CION's haematology team can review your child's transfusion history, ferritin trend and scan reports, and discuss the case at a tumour board where needed. We coordinate MRI and other tests with qualified centres. Bring every old report, and ask which test is due next.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Thalassaemia - Complications
- NHS — Thalassaemia - Treatment
- National Heart, Lung, and Blood Institute — Thalassemia
- American Society of Hematology — Blood disorders: information for patients
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Chelation Therapy: Deferasirox and AlternativesThe medicines that remove extra ironFerritin Targets and Monitoring in ThalassaemiaHow ferritin results are read over timeMRI T2* for Cardiac and Liver IronThe scan that shows iron in the heartGrowth, Puberty and Endocrine Issues in ThalassaemiaWhen iron affects hormone glandsThalassaemiaThe full thalassaemia guide
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