Hematologist
CION Cancer Clinics
Growth, puberty and hormone problems in thalassaemia | CION Cancer Clinics
Yes, thalassaemia major can slow growth and delay puberty. The main reason is iron from years of transfusions settling in the hormone glands, especially the pituitary. Low haemoglobin between transfusions and low vitamin D add to it. Regular height checks and yearly hormone tests catch it early, and missing hormones can usually be replaced. This page explains the signs, the checks to ask for, and what treatment can and cannot do. 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 can thalassaemia slow growth and puberty?
- Which glands can iron affect, and what happens?
- What checks should your child have, and when?
- Can delayed growth or puberty be treated?
- What do the words on the hormone report mean?
- What do families believe about growth, and what is true?
- What can this page not tell you?
- Common questions about growth and puberty in thalassaemia
The short answer
Why can thalassaemia slow growth and puberty?
Growth and puberty are run by small glands that make hormones, and those glands are very sensitive to extra iron. In thalassaemia major, every transfusion adds iron the body cannot get rid of on its own, so over the years it can settle in these glands and slow them down.
Iron is the main cause, but not the only one
A low haemoglobin that is not kept up between transfusions also holds growth back, because the body spends its energy making blood instead of building bone and muscle. Poor appetite, low zinc and vitamin D, and a large spleen can add to it. Some chelation medicines, the medicines that pull iron out of the body, can also affect growth when the iron level is already low. That is one reason the team adjusts them, and you should not.
What it looks like at home
A child who stays among the shortest in the class and keeps falling further behind. A girl whose breasts have not started to develop, or whose periods have not begun, well after her friends. A boy whose voice has not broken and who has not had his growth spurt. Teenagers often hide this.
Short height alone does not prove a hormone problem. Some children are simply small like their parents. The checks below sort out which is which.Where iron settles
Which glands can iron affect, and what happens?
Each gland shows the problem differently. Not every child gets all of these, and some get none.
Pituitary and sex glands
The pituitary is a pea-sized gland under the brain that tells the ovaries and testes when to start puberty. It is often the first gland iron harms, which is why late or stalled puberty is the most common hormone problem in thalassaemia.
Growth hormone
Made by the same pituitary gland. When it runs low, a child grows slowly year after year, even when transfusions are on time.
Thyroid
A slow thyroid causes tiredness, feeling cold, constipation and slow growth. It is easy to test and easy to miss.
Pancreas
Iron here can bring on diabetes in the teenage or adult years.
Signs to mention
- Great thirst
- Passing urine often
- Weight loss without trying
Parathyroid and bones
Low calcium control and missed puberty both thin the bones. Weak bones can break easily or ache in the back and legs.
Not sure whether this applies to you?
Ask an oncologistKeeping watch
What checks should your child have, and when?
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At every clinic visit
Height and weight measured the same way each time, and marked on a growth chart. One reading means little. The line across several visits shows whether your child is keeping pace.
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Once a year from early childhood
Blood tests for the thyroid, blood sugar, calcium and vitamin D, alongside the iron tests your team already does. Keep a copy of each report in one file.
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As puberty should begin
The doctor checks for early body changes and asks gently about periods or voice change. If nothing has started when it should, they will usually order hormone tests and an X-ray of the hand to read the bone age.
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Referral to a hormone specialist
An endocrinologist, a doctor for glands and hormones, reads the results and decides whether treatment is needed. The haematologist and endocrinologist should share reports with each other.
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Into adult life
Bone density scans, sugar tests and fertility questions carry on after growth has stopped. Hormone care does not end at school leaving age.
What can be done
Can delayed growth or puberty be treated?
Often, yes, and earlier is usually better. The plan has two parts: protect the glands from more iron, and replace any hormone that is running low.
Getting iron under control
Good transfusion timing and steady chelation matter more than any hormone. In some younger children, glands that are only mildly affected pick up again once iron comes down. Glands that have been damaged for years usually do not recover, which is why the early checks matter.
Replacing what is missing
An endocrinologist may start sex hormones, such as oestrogen for girls or testosterone for boys, often at a low level that is raised slowly so growth is not cut short. Thyroid tablets, vitamin D and calcium are common. Growth hormone injections are used for some children, but not all.
Who these treatments do not suit
Growth hormone does little once the growth plates in the bones have closed. Hormone treatment may be delayed in a child with heart or liver iron that is not yet controlled. Your team weighs this case by case.
Never start, stop or change hormones or chelation on your own. The doses are set by your treating team.Leave a number, we will call you
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On your report
What do the words on the hormone report mean?
- LH and FSH
- Messenger hormones from the pituitary that switch on puberty. Low levels in a teenager suggest the pituitary is not sending the signal.
- Bone age
- How mature the bones look on a hand X-ray. A bone age well behind the real age means there may still be time left to grow.
- TSH and free T4
- The two main thyroid tests. They are read together, not alone.
- IGF-1
- A blood marker that rises and falls with growth hormone. A low result often leads to a further test.
- DEXA scan
- A low-dose X-ray that measures how strong the bones are.
- Hypogonadism
- The ovaries or testes are not making enough sex hormone.
Commonly believed
What do families believe about growth, and what is true?
"He is just a late bloomer. He will catch up."
Some healthy children are late. In thalassaemia major, late puberty is common enough that it should be checked, not waited out. Waiting too long can mean less final height and weaker bones.
"More food and tonics will make her taller."
Good food helps, and so do vitamin D and calcium when they are low. No tonic replaces a hormone the body is not making. Iron tonics can do real harm in thalassaemia, because the body already has too much.
"Hormone treatment will make a girl infertile or a
boy aggressive."
Replacement hormones aim to give the body what it would normally make at that age. They are started low and watched. Many young people with thalassaemia later have children, sometimes with fertility help.
"If the ferritin is fine, the glands must be fine."
Ferritin, the blood test for stored iron, is only a rough guide. Glands can be affected even when ferritin looks acceptable, which is why the hormone tests are done separately.
Being straight with you
What can this page not tell you?
This page cannot tell you whether your child's height or puberty is normal for them. That needs a growth chart over time, a physical check and blood tests read by a doctor who knows the whole history. Reference ranges for hormone tests differ between laboratories and change with age and stage of puberty, so a single result is always read alongside symptoms and repeat tests.
Talking with your teenager
Being smaller or later than friends can hurt more than the transfusions. Some teenagers stop coming to clinic because of it. Let them see the doctor alone for part of the visit, and tell them this is a medical issue with a plan, not a failing of theirs.
What to bring to the next visit
Bring old height records, the parents' heights, recent ferritin and hormone reports, and a note of any periods or body changes. If your child is not yet seeing an endocrinologist and puberty seems late, ask the haematologist directly whether a referral is due.
Questions we are asked
Common questions about growth and puberty in thalassaemia
At what age is puberty considered late?
As a general guide, puberty is called delayed if a girl has no breast development by about thirteen, or a boy has no growth of the testicles by about fourteen. In thalassaemia, doctors often start checking a little before these ages. Your child's own doctor will judge it against the family pattern and the growth chart.
Will my child reach normal adult height?
Many do, especially when transfusions keep the haemoglobin steady, iron is controlled early and any hormone problem is treated on time. Some end up shorter than their parents. No one can predict final height from a single visit, but a bone age X-ray and the growth chart give your doctor a fair idea of what is left.
Can puberty problems be reversed?
Sometimes. In younger children with mild iron effects, the glands can recover when iron is brought down. When the pituitary has been damaged for years, the gland rarely recovers, but the missing hormones can be replaced. Replacement lets the body develop, even if the gland itself does not heal.
Does chelation itself cause short height?
Chelation mainly protects growth by removing iron. When iron levels are already low, some chelation medicines can slow growth or affect bones, which is why the team checks levels and adjusts the plan. Do not stop or reduce chelation because of height worries. Raise it at the next visit instead.
Will my daughter be able to have children?
Many women with thalassaemia major become mothers, often with help from fertility treatment and close care during pregnancy. The chances depend on how well the pituitary and heart have been protected from iron. Ask about fertility early, in the teenage years, rather than waiting until marriage is being planned.
What about my son's fertility?
Boys whose testes are not being signalled can often be helped with hormone treatment, and some later father children, sometimes with fertility support. A semen test in early adult life gives a clearer picture. Heart and iron status also matter, so the haematologist should be part of this planning.
Is diabetes common in thalassaemia?
It is more common than in other young people, mostly in teenagers and adults whose iron has been high for a long time. This is why blood sugar is tested every year. Tell the team about unusual thirst, passing urine often or weight loss, and do not wait for the yearly test if these appear.
Does a transplant fix growth problems?
A successful stem cell transplant stops the need for regular transfusions, so no new iron builds up. It does not undo gland damage that has already happened, and the conditioning treatment before a transplant can itself affect puberty and fertility. Hormone checks carry on afterwards.
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
- NHLBI — Thalassemias
- NHS — Early or delayed puberty
- American Society of Hematology — Blood disorders: patient education
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
Iron Overload in ThalassaemiaHow iron harms the heart, liver and glandsChelation Therapy: Deferasirox and AlternativesThe medicines that protect the glands from ironFerritin Targets and Monitoring in ThalassaemiaWhat the iron test does and does not showSchool and Work With ThalassaemiaHelping your child through school and teenage yearsThalassaemiaThe full guide to thalassaemia
Talk to us
Worried your child is growing slowly?
Share the growth record and recent reports with us. CION's haematology team will review them and help you reach the right hormone specialist. One helpline serves every CION centre.