What Are the First Signs of Childhood Cancer? Oncologist Shares Warning Signs Parents Shouldn't Ignore

Childhood cancer is rare, but catching it early can make a real difference to a child's outcome. The trouble is, the first signs often look like nothing more than a common illness, which is exactly why they can be easy to miss. So what should parents actually be watching for, and when does a symptom cross the line from "probably nothing" to "get it checked"? Read on to know what an oncologist has to explain. 

Can Childhood Cancer Happen at Any Age?

Dr Ankur Nandan Varshney, Senior Consultant, Medical Oncology, Haematology and Bone Marrow Transplant at Medanta Hospital, Noida, explains that childhood cancer can occur at any age, though certain types tend to appear at different stages. Leukaemia and neuroblastoma are more likely to develop in younger children, while bone cancers are more likely to develop in older children and teenagers.

According to the World Health Organization (WHO), around 400,000 children and teens are diagnosed with cancer each year. The most common types are leukaemia, brain tumours and solid tumours such as neuroblastoma. There is a huge difference between the survival rates in different countries, with more than 80% cured in wealthier countries and under 30% in many of the lower-income ones.

What Are the Early Signs of Childhood Cancer?

According to Dr Varshney, early signs of childhood cancer are often mistaken for common illnesses, which makes awareness especially important. Signs worth paying attention to include:

• Persistent, unexplained fever
• Unusual lumps or swelling in the abdomen, neck, or limbs
• Ongoing fatigue or paleness
• Easy bruising or bleeding
• Bone pain or a limp that won't go away
• A white reflection in the eye 
• Unexplained weight loss
• Morning headaches with vomiting

How Can You Detect Cancer Early in Children?

The only screening test for childhood cancer is awareness, and Dr Varshney reiterates this. If a symptom persists after the typical recovery period of a common illness (e.g., fever for more than a week or fatigue that worsens with rest), it may be beneficial to seek testing. The regular check-ups by paediatricians also help to detect early symptoms which may not be recognised, such as abdominal engorgement.

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What Tests Help Detect Cancer in Children?

According to the American Academy of Pediatrics (HealthyChildren.org), diagnosing childhood cancer often starts with blood tests, like a complete blood count, to check for abnormal cells. Different cancers, like leukaemia or solid tumours, need different combinations of these tests.

If cancer is suspected, doctors typically rely on a combination of tests to confirm a diagnosis. Dr Varshney outlines the main ones:

• Blood tests – a complete blood count to flag leukaemia or other blood cancers
• Imaging – ultrasound, X-ray, CT, or MRI to check for tumours or swelling
• Biopsy – a tissue sample to confirm the diagnosis
• Bone marrow test – used for suspected leukaemia
• Tumour marker blood tests – used for specific cancer types

Can Childhood Cancer Be Prevented?

The majority of childhood cancers are not associated with lifestyle factors that are preventable. Dr Varshney says they're frequently caused by genetic factors that are not readily identifiable. However, there are a few things that can still be taken to try and help:

• Evading unnecessary radiation or medical imaging.
• Frequent prenatal care while pregnant
• Not exposing the mother to tobacco and alcohol during pregnancy.Prevention of exposure of the mother to tobacco and alcohol during pregnancy.
• Regular vaccinations (e.g. Hepatitis B)
• If there is a family history of cancer, it is important to seek genetic counselling.

According to the American Cancer Society, most childhood cancers can't be prevented, since they're usually caused by random gene changes rather than lifestyle habits. That said, avoiding smoking during pregnancy and limiting a child's radiation exposure, especially from unnecessary scans, may help lower certain risks. 

Beyond that, parents can support long-term health with vaccinations, sun protection, and healthy habits, which reduce cancer risk later in adulthood rather than in childhood itself.

When Should You See a Doctor?

Sometimes it can be hard to know when a symptom should be taken to the doctor, particularly with young children. If a child has any of the following, he or she should see a doctor, Dr Varshney advises:

• If the fever persists for more than 7-10 days.
• A lump or swelling that doesn't go away or gets worse
• Fatigue, pallor or decreased appetite that lasts more than 2 weeks
• Bleeding or bruising that doesn't have a cause that can be explained
• Recurrent bone pain or a limp.
• Frequent headaches associated with vomiting.
• A white light shining through a child's eye when taking a picture.

What Are the Treatment Options for Childhood Cancer?

When the diagnosis is confirmed, Dr Varshney says that the treatment depends on the type of cancer and may be one or more of the following:

• Chemotherapy – the main treatment for leukaemias and many solid tumours
• Surgery – for solid tumours (excision)
• Radiotherapy (carefully used, as children are more sensitive to radiation)
• Treatment involving bone marrow or stem cell transplants – for some types of leukaemia
• Surgery, radiation, and other treatments for certain types of cancer may be more side-effect-free than other treatments

Conclusion

Childhood cancer can be frightening to think about, but recognising the early signs and acting on persistent symptoms can make a genuine difference. If something doesn't resolve the way a common illness usually would, it's always worth getting it checked rather than waiting it out.