The aim of this article is to help parents recognise the small number of patterns that warrant a same-week GP appointment, without producing the anxious version of medicine that turns every bruise into a worry. Childhood cancer is rare, treatable in most cases, and increasingly survivable. Pattern and persistence — not single symptoms — are what matter. Healthbooq (healthbooq.com) covers serious childhood illness alongside the everyday.
The Numbers, Honestly
In the UK, around 1,900 children under sixteen are diagnosed with cancer each year. Roughly one in 500 children will be diagnosed before they reach fifteen. It remains the leading disease-related cause of childhood death in the UK.
Survival has transformed. Overall five-year survival is now around 84 per cent across all childhood cancers; for the most common — acute lymphoblastic leukaemia — it is around 90 per cent. Fifty years ago the equivalent figures were near 30 per cent. The improvement comes from better treatment protocols, better supportive care, and, in some cancers, earlier diagnosis.
That last bit is what this article is for. For some childhood cancers — particularly brain tumours — diagnostic delays in the UK have been longer than in similar countries. The HeadSmart campaign documented that the average time from symptom onset to brain tumour diagnosis was around 16 weeks. Reducing that delay — by parents and GPs both knowing the patterns — improves outcomes.
The Common Types
Leukaemia — about 30 per cent of childhood cancers. Acute lymphoblastic leukaemia (ALL) is the most common, peaking between two and five years. It arises from the bone marrow, crowding out normal blood cell production. Survival around 90 per cent.
Brain and central nervous system tumours — about 25 per cent. The most common solid tumour of childhood. Diverse in type (medulloblastoma, ependymoma, glioma, others) and location. Outcomes vary substantially by type and grade.
Lymphoma — Hodgkin and non-Hodgkin lymphomas together about 10 per cent.
Neuroblastoma — usually under five, often arising from the adrenal glands or the sympathetic nervous system.
Wilms tumour — kidney cancer, usually under five, presenting with abdominal swelling.
Retinoblastoma — eye cancer, mostly under three.
Bone cancers — osteosarcoma and Ewing sarcoma, more common in older children and teens.
Soft tissue sarcomas — rhabdomyosarcoma the most common.
Signs That Warrant a GP Appointment
These are not symptoms that should cause panic in isolation. Many of them have everyday explanations — a viral illness, a knock at school, a growing pain, a tension headache. They warrant a GP visit when they are persistent, recurrent, or occur in combination.
Leukaemia signs
- Unusual pallor and fatigue not explained by recent illness or sleep
- Recurrent or persistent fevers without clear infection
- Unexplained bruises in places that don't usually bruise (back, abdomen, behind ears) or out of proportion to any knock
- Petechiae — tiny red, purple, or brown pinprick spots that do not fade when pressed under a glass — anywhere on the body. Petechiae alongside fever or feeling unwell is a same-day GP / 111 contact and a non-blanching rash with fever requires 999 or urgent A&E (this can be meningococcal sepsis as well)
- Repeated significant infections — chest, ear, throat — beyond a normal nursery cycle
- Bone or joint pain that wakes the child at night, or pain that doesn't fit with activity
- Swollen lymph nodes that persist or grow
- Abdominal swelling
- Easy bleeding from gums or nose without obvious cause
Brain tumour signs (HeadSmart campaign)
- New persistent or recurrent headaches, particularly waking the child from sleep
- Morning headaches with vomiting
- Vomiting that has no apparent cause and persists
- New neurological symptoms — weakness in a limb, change in gait, double vision, eye that turns out, drooping face
- A first seizure in a child with no previous epilepsy
- Balance problems or unsteady walking
- Abnormal eye movements
- Personality or behaviour change without clear cause
- Growth problems, including a child who has stopped growing or who has unexplained weight gain
- Precocious puberty (puberty starting unusually early) — can indicate hypothalamic/pituitary tumours
Eye signs
- A white pupillary reflex in flash photographs (leukocoria) — when one eye consistently looks white in flash photos rather than the standard red-eye effect. Same-week GP referral.
- A new squint developing in an infant or young child
- Unexplained vision change
General signs across many childhood cancers
- An unexplained lump or swelling anywhere in the body
- Persistent or recurrent fever without clear cause
- Unexplained weight loss
- Persistent pain in one location
- Unusual tiredness over weeks
- Easy or unexplained bruising
Specific signs of less common cancers
- Wilms tumour: firm abdominal swelling, often noticed when bathing or getting dressed; sometimes blood in urine
- Neuroblastoma: abdominal mass; sometimes "panda eyes" (dark circles); irritability; bone pain; in young infants, blueberry-muffin skin lesions
- Bone tumours: persistent pain in one bone, often worse at night, sometimes a swelling; usually older children and teens
Pattern and Persistence
The single most useful concept in spotting cancer signs in children: pattern and persistence.
A child with a one-off bruise on the shin: ordinary.
A child with multiple bruises in odd places that keep appearing without obvious cause: see the GP.
A child with a headache after a busy day: ordinary.
A child with headaches three or four times a week for a month, often in the morning: see the GP.
A child with a fever during a cold: ordinary.
A child with recurring unexplained fevers over a couple of months: see the GP.
A child tired after starting nursery: ordinary.
A child with persistent unusual fatigue plus pallor over weeks: see the GP.
How to Bring Concerns to the GP
Practical things that help the consultation:
- Keep a brief symptom diary. Dates, what was noticed, how long it lasted. Memory is unreliable; written records are not.
- Photographs of any rash, bruise, swelling, or eye appearance — date-stamped on a phone — are useful.
- Bring the pattern, not the worst individual symptom. "He's had a headache" is less informative than "he's had headaches three or four mornings a week for the last month, sometimes with vomiting."
- Name the worry directly. Parents sometimes hint at what they are worried about; clinicians do better with directness. "I'm worried this could be something serious — could you check?"
- If reassured but the pattern continues, go back. GPs see a small number of childhood cancers in their careers and welcome a second look. Returning is not over-anxious; it is appropriate.
- Trust your instinct. Parental concern is recognised in NICE referral guidance as a legitimate factor warranting investigation.
What Investigation Looks Like
Initial GP investigation typically involves a thorough examination, a full blood count (which picks up most leukaemias), and sometimes urine tests. Depending on findings, urgent referrals follow under the two-week wait suspected cancer pathway. For brain tumour suspicion, the GP can refer urgently to paediatrics for imaging (typically MRI). For unexplained masses, ultrasound is often the first imaging.
Most referrals turn out to be benign — that is the point of having a low threshold to investigate. Hearing "we found nothing concerning" is the most common outcome and the right one.
What This Is Not
The aim is not to convert parents into amateur oncologists watching every bruise. Most:
- Bruises in active children are bruises
- Headaches in stressed children are tension headaches
- Tired children are sleep-deprived
- Lumps near the jaw or under the arm during a viral illness are reactive lymph nodes, not cancer
- Children who are off colour for a few days are usually viral
The signs above warrant attention when they are persistent, recurrent, unexplained, or occur in combination. Singletons in an otherwise well child are usually nothing.
Where Support Comes From, If Cancer Is Diagnosed
If the worst happens, UK children's cancer care is concentrated in 21 principal treatment centres covering all paediatric oncology. Specialist multi-disciplinary teams, dedicated nursing support, and access to clinical trials are all part of standard care. Charities supporting families:
- Young Lives vs Cancer (formerly CLIC Sargent) — practical, financial, and emotional support for the whole family. younglivesvscancer.org.uk
- Children's Cancer and Leukaemia Group (CCLG) — patient information and education resources at all stages.
- The Brain Tumour Charity (and HeadSmart) — specifically for children with CNS tumours.
- Childhood Eye Cancer Trust — retinoblastoma support.
- Make-A-Wish — granted experiences for seriously ill children.
A Realistic Final Note
Childhood cancer is rare, recoverable in the great majority of cases, and worth knowing the signs of without becoming preoccupied. Most of the things this article describes are also features of viral illnesses, growth, normal childhood scrapes, and tiredness. The skill is recognising the small number of times when those features keep appearing without explanation and bringing them to the GP — clearly, factually, and without apology. Parents who do this are not being over-anxious. They are doing the job.
Key Takeaways
Childhood cancer is rare — about 1 in 500 children by age 15 — but early diagnosis matters because paediatric tumours grow quickly. The signs to know are specific rather than vague. Persistence and pattern matter most. Eighty per cent of UK children with cancer now survive long-term. The signs in this article are worth recognising; they should not become a daily anxiety.
