7 Childhood Cancer Warning Signs Every Parent Should Know

A stuffy nose, watery eyes, or unusual tiredness may seem like ordinary childhood symptoms. Most of the time, they are. But in rare cases, persistent or unexplained changes in a child’s health may signal something more serious.

That was the experience of Jake Swinscoe, who was diagnosed with alveolar rhabdomyosarcoma at age 13. His symptoms initially resembled common ailments, including a stuffy nose and watery eyes. Later, swelling appeared across the bridge of his nose. His story has since helped raise awareness of childhood cancer and the importance of recognizing symptoms that do not go away.

Jake died in April 2024, shortly before his 14th birthday. His story is a heartbreaking reminder that childhood cancer can sometimes be difficult to recognize early.

A single symptom rarely points to cancer on its own. What matters most is whether symptoms persist, worsen over time, or appear alongside other unexplained changes.

Here are seven warning signs parents should know—and when it may be time to seek medical advice.

1. Persistent, Unexplained Fatigue

Children can feel tired after a busy day, a poor night's sleep, or a viral illness. However, fatigue that continues without a clear explanation deserves attention, particularly if a child seems unusually weak, loses interest in normal activities, or has difficulty keeping up with everyday routines.

Persistent fatigue can have many causes, including sleep problems, anemia, infections, and other medical conditions. If it continues or is accompanied by additional symptoms, consult your child's pediatrician.

2. Unusual Bruising or Bleeding

Occasional bruises are common in active children. More concerning patterns include frequent or unexplained bruising, unusual bleeding, or tiny red or purple spots on the skin that are not easily explained.

These changes can occur for several reasons, many of which are not cancer. However, persistent or unexplained bruising and bleeding should be assessed by a healthcare professional, especially when accompanied by fatigue, paleness, or other changes in health.

3. A Lump or Swelling That Persists or Grows

A lump may result from an infection, an injury, or a swollen lymph node. Many are harmless and resolve on their own.

Parents should pay attention to a lump or swelling that grows, persists, or has no clear explanation. Swelling in the abdomen, neck, or another part of the body may warrant medical evaluation, particularly if it occurs with pain, fever, weight loss, or unusual tiredness.

Do not try to determine whether a lump is cancerous by appearance or touch alone. A clinician can assess it and decide whether further testing is needed.

4. Frequent Headaches or Vomiting Without a Clear Cause

Headaches and vomiting are common in childhood and often result from relatively minor illnesses. The pattern and accompanying symptoms, however, matter.

Seek medical advice if headaches are persistent, increasingly severe, or accompanied by repeated vomiting or changes in vision, balance, or behavior.

A sudden, severe headache or symptoms such as new weakness, confusion, seizures, or difficulty walking require urgent medical assessment. Do not wait for symptoms to persist when a child appears seriously unwell.

5. Persistent or Unexplained Pain

Growing children may experience occasional aches, and active children often develop minor injuries. Pain becomes more concerning when it persists, repeatedly returns without a clear cause, worsens over time, or interferes with sleep and everyday activities.

Pay attention to unexplained bone or joint pain, persistent abdominal discomfort, or pain that does not improve as expected. These symptoms have many possible explanations, but a pediatrician should evaluate ongoing or worsening pain.

6. Fever or Repeated Illness Without a Clear Explanation

Fever is usually caused by infection, and children commonly become ill as their immune systems encounter new germs. However, recurrent or persistent fever without an obvious explanation may require further investigation.

Contact your child's pediatrician if fever continues, repeatedly returns, or occurs alongside other unexplained symptoms such as unusual fatigue, bruising, or weight loss.

Seek urgent medical care if your child has difficulty breathing, is difficult to wake, appears severely dehydrated, or develops other signs of serious illness.

7. Unexplained Weight Loss or Persistent Paleness

Children's weight and appearance can change as they grow, but noticeable weight loss without an intentional dietary change should not be ignored. Persistent paleness may also deserve attention, particularly when accompanied by weakness, fatigue, or shortness of breath.

These signs can be associated with many conditions, including nutritional deficiencies, anemia, and other illnesses. If the changes are unexplained or continue over time, arrange a medical evaluation.

What Should Parents Do?

Recognizing possible warning signs does not mean assuming the worst. Most childhood symptoms are caused by conditions other than cancer, and no single symptom can diagnose it.

Parents can take a few practical steps:

• Track changes. Note when symptoms began, how often they occur, and whether they are getting worse.
• Look at the overall pattern. Multiple unexplained symptoms occurring together may be more concerning than one isolated symptom.
• Contact a pediatrician. Explain what you have observed and how the symptoms affect your child's daily life.
• Seek urgent care when necessary. Severe or rapidly worsening symptoms should not wait for a routine appointment.

For more information, read Jake Swinscoe’s story from Alice’s Arc and the American Academy of Pediatrics guidance on childhood and adolescent cancer symptoms.

Awareness Without Unnecessary Fear

Childhood cancer is rare, and symptoms such as fatigue, headaches, fever, and bruising are far more often associated with other conditions. Still, persistent or unexplained changes deserve attention.

Parents do not need to diagnose their children. Their role is to notice when something is unusual, seek professional advice, and follow up when symptoms do not improve.

The most useful approach is a balance of awareness and perspective: do not assume that every symptom is dangerous, but do not hesitate to ask for help when something does not seem right.