Childhood cancer is rare, and parents need to hold that rarity alongside awareness of the signs. The danger of over-awareness is anxiety about symptoms that have completely ordinary causes; the danger of under-awareness is missing a pattern of signs that warrants urgent investigation.
The symptoms that should prompt an urgent GP assessment are not vague – they are specific enough to be meaningful without triggering alarm at every bruise or headache. What the research and the charities in this area consistently emphasise is that the pattern and persistence of symptoms matters as much as any individual sign.
Healthbooq (healthbooq.com/apps/healthbooq-kids) covers serious childhood illness and when to seek help.
Why Early Diagnosis Matters
Childhood cancers differ from adult cancers in important ways. They tend to grow quickly – paediatric cancer cells often divide rapidly – which means delay between symptom onset and diagnosis can allow significant spread. For some cancers, particularly brain tumours, diagnostic delay remains a significant problem in the UK. The HeadSmart campaign, developed by the Brain Tumour Research charity and based at the University of Portsmouth, documented that the average diagnosis time for brain tumours in children was around 16 weeks – substantially longer than in some other European countries.
Survival rates have improved dramatically since the 1970s: overall 5-year survival for childhood cancer is now around 80%, up from around 30% fifty years ago. This improvement reflects better treatments and, for some cancers, earlier diagnosis.
The Most Common Types
Leukaemia accounts for around 30% of childhood cancers. Acute lymphoblastic leukaemia (ALL) is the most common, with a peak incidence between 2 and 5 years. Survival for childhood ALL is now around 90% with treatment. It arises from the bone marrow and affects the production of normal blood cells.
Brain and CNS tumours are the second most common type, accounting for around 25% of childhood cancers. They are diverse in type (medulloblastoma, ependymoma, glioma) and location, and outcomes vary considerably by tumour type and grade. They are the most common solid tumour of childhood.
Lymphomas (Hodgkin and non-Hodgkin) together account for around 10% of childhood cancers.
Other childhood cancers include neuroblastoma (adrenal/sympathetic nervous system), Wilms tumour (kidney), retinoblastoma (eye), bone tumours (osteosarcoma, Ewing sarcoma), and soft tissue sarcomas.
Signs That Warrant a GP Assessment
These are not symptoms that should cause panic in isolation; they are symptoms that, if persistent, recurrent, or occurring in combination, should prompt a GP assessment urgently.
Leukaemia signs: unusual pallor and fatigue; persistent fever; unexplained bruising or petechiae (tiny red or purple pinprick spots that do not fade under pressure); repeated infections; bone or joint pain (particularly at night); swollen lymph nodes; abdominal swelling (enlarged liver or spleen).
Brain tumour signs (HeadSmart campaign): persistent or recurrent headaches (particularly new, waking the child from sleep, or progressively worsening); morning headaches with vomiting; new neurological symptoms (weakness, change in gait, double vision, facial drooping); seizures in a child with no previous seizure history; balance problems; abnormal eye movements; behaviour change or personality change without clear cause; growth problems; unexplained weight gain or precocious puberty (hypothalamic/pituitary tumours).
General childhood cancer warning signs (CLIC Sargent CANK – Childhood Cancer Awareness Network Key signs):- An unexplained lump or swelling anywhere in the body
- Unexplained persistent or recurrent fevers
- Unexplained weight loss
- Persistent pain in any part of the body
- Unusual or persistent tiredness
- Unexplained bruising
- Changes in vision or new squint
- Abnormal pallor
What Retinoblastoma Looks Like
Retinoblastoma (eye cancer) presents with a white pupillary reflex (leukocoria – the pupil appears white rather than red in flash photography) or a new squint. Any white pupil on a photograph, or a new squint that develops in an infant or young child, should be assessed urgently. Retinoblastoma treated early is highly curable; delayed treatment risks the eye and, in advanced cases, metastatic spread.
How to Raise Concern
Parents who are worried about unexplained or persistent symptoms should bring them to the GP with a clear description: which symptoms, for how long, how frequently, and whether they are new or have changed. Keeping a brief symptom diary (dates, descriptions) is helpful when the pattern is intermittent. If a GP assessment is reassuring but symptoms persist or worsen, returning and escalating the concern is appropriate. Parental concern is a legitimate and important clinical input.
Key Takeaways
Childhood cancer affects approximately 1 in 500 children in the UK by the age of 15, with around 1,900 new diagnoses each year. It is the leading disease-related cause of death in childhood. While it is uncommon, early diagnosis significantly improves outcomes. The HeadSmart and CLIC Sargent organisations have identified specific warning signs that every parent and healthcare professional should know. Leukaemia and brain tumours are the most common types. Survival rates have improved dramatically – more than 80% of children with cancer now survive – but delays in diagnosis can compromise outcomes in cancers where speed matters.
