At a glance
Childhood cancer is different from cancer in adults. It is rare, it is almost never caused by lifestyle, and most childhood cancers respond very well to treatment — in the UK, more than 8 in 10 children with cancer now survive. The most common types are leukaemia (a blood cancer) and brain tumours. Early symptoms can look like ordinary childhood illnesses, so it is symptoms that are unusual, persistent or unexplained that should be checked by a doctor. The heartbreaking difference is geography: in many low-income countries, where treatment is hard to reach, far fewer children survive.
Editorial summary of published sources. A named oncology clinician has not signed off this guide. Use it to prepare questions for your healthcare team, not to diagnose symptoms or choose treatment. How we publish health information.
Explore this guide
What is childhood cancer?
Childhood cancer is different from cancer in adults. It is rare, it is almost never caused by lifestyle, and most childhood cancers respond very well to treatment — in the UK, more than 8 in 10 children with cancer now survive. The most common types are leukaemia (a blood cancer) and brain tumours. Early symptoms can look like ordinary childhood illnesses, so it is symptoms that are unusual, persistent or unexplained that should be checked by a doctor. The heartbreaking difference is geography: in many low-income countries, where treatment is hard to reach, far fewer children survive.
Childhood cancer is not simply a smaller version of adult cancer. The types of cancer children develop, the way they respond to treatment, and the causes behind them are all different. Crucially, childhood cancers are rarely linked to lifestyle or anything a parent did or did not do — in most cases, no cause is ever found.
There is real hope in the figures. Decades of research and specialist care mean that, in the UK, more than eight in ten children diagnosed with cancer now survive for at least five years, and many are cured completely. Treatment is delivered by expert teams at specialist children's cancer centres.
This guide explains the most common childhood cancers, the warning signs worth knowing, and how these cancers are treated — and why, despite all this progress, a child's chance of survival still depends enormously on where in the world they are born.
When should you see a doctor about childhood cancer?
Most of these symptoms have a less serious cause — but it is always worth getting them checked. See a GP if you notice a new or persistent change. If you feel very unwell, contact NHS 111 or seek urgent help.
Take a note of how long the symptom has lasted and whether it is getting worse. You do not need every sign on a list to book an appointment.
This guide is general information from World Aid Network, not a diagnosis and not UK NHS care. Only a clinician can assess you.
- A lump or swelling anywhere on the body, especially if it is painless or growing
- Unusual paleness, or tiredness that does not improve with rest
- Easy or unexplained bruising or bleeding
- A fever or repeated infections that will not go away
- Persistent bone, joint or limb pain, or a new limp
- Frequent headaches, especially with being sick in the morning
- A white glow or reflection in a child's eye, sometimes seen in photographs
- Losing weight without an obvious reason
How childhood cancer is different
Cancer in children is rare. In the UK, around 1,900 children aged under 15 are diagnosed each year. Unlike many adult cancers, childhood cancers are very rarely caused by smoking, diet or other lifestyle factors. Most arise from changes in cells that happen by chance, very early in life, and only a small number are linked to inherited genetic conditions.
Because children's bodies are still growing, their cancers often grow more quickly than adult cancers — but they also tend to respond much better to treatment such as chemotherapy. This combination is part of why survival rates for childhood cancer have improved so dramatically.
The most common types of childhood cancer
The pattern of cancer in children is quite different from adults. The most common types are:
Leukaemia — cancer of the blood and bone marrow — is the single most common childhood cancer, accounting for around a third of cases. The most frequent form is acute lymphoblastic leukaemia (ALL), which is now highly treatable. Brain and spinal cord tumours are the next most common group. Lymphomas (cancers of the lymphatic system) are also common, particularly in older children and teenagers.
Other childhood cancers include neuroblastoma (which develops from nerve cells, usually in very young children), Wilms tumour (a kidney cancer of early childhood), bone cancers such as osteosarcoma and Ewing sarcoma (more common in teenagers), soft tissue sarcomas, and retinoblastoma (an eye cancer of young children).
Warning signs for parents
Most childhood illnesses are not cancer, and the symptoms of childhood cancer often overlap with common, harmless conditions. What matters is when symptoms are unusual, persistent, or cannot be explained. Trust your instincts: parents know their children best, and it is always reasonable to ask a doctor to take another look if a problem is not getting better.
Signs worth checking include a lump or swelling that is painless or growing, unusual tiredness or paleness, easy bruising or bleeding, a fever or infections that will not clear, persistent bone or joint pain or a new limp, frequent headaches with morning sickness, unexplained weight loss, or a white glow in a child's eye (sometimes first noticed in photographs). None of these on its own means cancer, but any that persist should be assessed.
How childhood cancer is treated
Children with cancer in the UK are treated at specialist children's cancer centres by teams who care only for young patients. The main treatments are chemotherapy (medicines that kill cancer cells), surgery, and radiotherapy, often used in combination. Newer targeted therapies and immunotherapies are increasingly part of treatment for certain cancers.
Treatment is intensive and can last months or years, and the teams that deliver it also support the whole family — managing side effects, schooling, and the emotional impact. Because children's bodies are still developing, their care is carefully designed to give the best chance of cure while protecting their long-term health and growth.
Read more: Treatment & support
The global survival gap
The progress made in countries like the UK has not reached everyone. The World Health Organization estimates that around 400,000 children develop cancer worldwide each year. In high-income countries, more than 80% survive — but in many low- and middle-income countries, survival can be 30% or lower.
The reasons are not the cancers themselves but the barriers around them: diagnosis comes too late, families cannot afford or reach treatment, essential medicines are unavailable, and some children stop treatment because the cost is impossible to bear. The WHO's Global Initiative for Childhood Cancer aims to lift survival to at least 60% worldwide. World Aid Network funds cancer treatment for poor patients, including children, through locally-licensed oncologists — helping to close exactly this gap.
What are the key takeaways?
The most important points on childhood cancer for patients, families and donors.
- Childhood cancer is rare and very rarely caused by lifestyle — in most cases no cause is ever found.
- In the UK, more than 8 in 10 children with cancer now survive at least five years.
- Leukaemia and brain tumours are the most common childhood cancers.
- Symptoms often look like common illnesses; it is unusual, persistent or unexplained signs that should be checked.
- Survival depends heavily on where a child lives — often under 30% in low-income countries, compared with over 80% in the UK.
What will a donation for childhood cancer treatment provide?
A gift to World Aid Network's Cancer Emergency Appeal helps pay for diagnosis and treatment that a poor patient has been recommended but cannot afford. Costs vary by diagnosis, provider and treatment plan; no fixed gift guarantees a complete treatment. Trustees direct gifts to the most urgent cases.
This is treatment access, not laboratory research and not UK NHS care. Clinicians in partner hospitals decide the medical plan. We fund the bill in Pakistan, Indonesia and Malaysia.
The Cancer Emergency Appeal funds all types of cancer. Trustees direct gifts to the most urgent hospital bills in Pakistan, Indonesia and Malaysia.
| Area of support | Funding depends on assessed need |
|---|---|
| Diagnosis | A contribution towards appropriate tests and clinical assessment |
| Treatment | A contribution towards clinician-recommended care, subject to available funds |
| Continuity of care | Support for the wider cancer fund rather than a guaranteed treatment purchase |
There is no fixed donation amount that guarantees a test, chemotherapy session or operation. Costs and availability vary. Read the appeal before choosing your gift.
Cancer Emergency Appeal · Where your money goes · Evidence and reporting
Donate to cancer careHow can I donate to help people with childhood cancer?
Donate by card at worldaidnetwork.org/donate and choose the Cancer Emergency Appeal. World Aid Network is a UK charitable organisation with a CIO registration application in progress; Gift Aid is not currently available; HMRC recognition and donor eligibility are required.
If you need UK support as a patient or relative, see a GP, NHS 111, Macmillan or the specialist UK charity for this cancer. We fund treatment overseas; we are not a UK helpline.
What could you ask your healthcare team?
Use this checklist when discussing childhood cancer. Bring a list of symptoms, medicines and relevant family history. Tick the questions you want to ask. Your selections stay on this page and are not sent or saved.
General appointment preparation, not an assessment of your health. World Aid Network · worldaidnetwork.org
How to get a child’s persistent symptoms checked
Childhood cancer is rare. Symptoms often look like ordinary illnesses. What matters is a sign that is unusual, persistent or unexplained — trust your instincts and see a doctor.
- Watch for patterns, not one-off bugs. A bruise is normal; easy bruising all over without knocks is worth checking. Tiredness that does not improve with rest is worth checking.
- Book a GP appointment. Take notes on how long symptoms have lasted. You are not wasting the doctor’s time.
- Go back if it is not improving. Parents know their child. If something still feels wrong, ask for another look.
- Seek urgent help when needed. A child who is very unwell quickly, hard to wake, or has a rash that does not fade under pressure needs emergency care.
Frequently asked questions
How common is childhood cancer?
Childhood cancer is rare. In the UK, around 1,900 children aged under 15 are diagnosed each year. Although any childhood cancer is devastating for a family, it accounts for a very small proportion of all cancers, and survival rates are now high — more than 8 in 10 children survive at least five years.
What causes childhood cancer?
In most cases, the cause is unknown. Unlike many adult cancers, childhood cancers are very rarely linked to lifestyle, diet or anything a parent did. Most result from chance changes in cells very early in life. A small number are linked to inherited genetic conditions. Importantly, nothing a parent did caused their child's cancer.
What are the most common cancers in children?
Leukaemia (cancer of the blood and bone marrow) is the most common, making up about a third of childhood cancers, with acute lymphoblastic leukaemia (ALL) the most frequent form. Brain and spinal cord tumours are next, followed by lymphomas. Other types include neuroblastoma, Wilms tumour (kidney), bone cancers and retinoblastoma (eye).
What are the warning signs of cancer in children?
Warning signs include a lump or swelling, unusual paleness or tiredness, easy bruising or bleeding, a fever or infections that will not clear, persistent bone or joint pain or a limp, frequent headaches with morning vomiting, unexplained weight loss, or a white glow in the eye. These symptoms usually have harmless causes, but any that are unusual, persistent or unexplained should be checked by a doctor.
Is childhood cancer treatable?
Yes — childhood cancers generally respond much better to treatment than adult cancers. In the UK, more than 8 in 10 children with cancer survive at least five years, and many are cured. Treatment usually involves chemotherapy, surgery and radiotherapy, often combined, delivered by specialist children's cancer teams.
How is childhood cancer treated?
Children are treated at specialist children's cancer centres. The main treatments are chemotherapy, surgery and radiotherapy, increasingly alongside targeted therapies and immunotherapy for certain cancers. Treatment can last months or years and is carefully designed to maximise the chance of cure while protecting a child's growth and long-term health. The whole family is supported throughout.
What is the white glow in a child's eye?
A white glow or reflection in the pupil — instead of the usual red-eye in flash photographs — can be a sign of retinoblastoma, a rare eye cancer of young children. It can also have other, harmless causes. If you notice a white reflection in your child's eye, in photos or in person, have it checked by a doctor promptly.
Why do fewer children survive cancer in poorer countries?
The cancers are treatable, but the barriers around treatment are not removed. In many low- and middle-income countries, cancer is diagnosed late, specialist care and medicines are scarce, and families cannot afford or reach treatment — so some children never start or are unable to complete it. As a result, survival can be 30% or lower, compared with over 80% in the UK. World Aid Network funds cancer treatment for poor patients, including children, through locally-licensed oncologists to help close this gap.
What could you read next?
What are the sources for this guide?
Follow the original guidance for its evidence, dates and limitations. General background references are not a clinical review of this page.
- Cancer Research UK — Children's cancer
- WHO — Childhood cancer
- NHS — Cancer information
- Cancer Research UK — Cancer types
- NHS — Children and young people's cancer information
- World Health Organization — CureAll / Global Initiative for Childhood Cancer