When should you worry about food allergies in children?
By Associate Professor Alberto Pinzon Charry
Paediatric allergist and immunologist in Woolloongabba, Brisbane
It’s not unusual for children to react to foods from time to time. A rash after strawberries, a sore tummy after dairy, or refusing certain foods can quickly leave parents wondering:
Is this a food allergy?
The challenge is that food allergies can look very different from child to child. Some reactions are mild, while others can become serious very quickly. Knowing what to watch for and when to seek help can make a big difference.
What is a food allergy?
A food allergy occurs when the immune system reacts to a food as though it is harmful.
In children, common food allergies include:
- peanut
- tree nuts
- egg
- milk
- wheat
- soy
- seafood.
Some allergic reactions happen immediately, while others can be less obvious.
Signs that may suggest a food allergy
One of the biggest clues is timing. Symptoms often occur soon after eating a particular food.
Possible signs include:
- hives or welts
- swelling of the lips, face or eyes
- vomiting shortly after eating
- wheezing, coughing or breathing changes
- persistent itching
- dizziness or appearing pale and floppy (particularly in babies).
Some children may only have mild symptoms initially, but it’s important to remember that allergic reactions can sometimes become more severe with future exposures.
When should parents be more concerned?
There are certain situations where it’s important to seek medical advice promptly.
Reactions involving breathing or swelling
Any reaction involving:
- difficulty breathing
- wheezing
- throat tightness
- swelling of the tongue
- collapse or severe lethargy
requires urgent medical attention.
These can be signs of anaphylaxis, a severe allergic reaction.
Repeated reactions to the same food
If your child consistently develops symptoms after eating a particular food, it’s worth having this properly assessed, even if symptoms seem mild.
Parents sometimes assume they should simply avoid the food and move on, but getting the correct diagnosis is important for:
- safety
- nutrition
- understanding future risk
- knowing whether the allergy may be outgrown.
Eczema and food allergy – are they connected?
This is something many parents ask about. Children with eczema are more likely to develop allergies, particularly if their eczema is moderate to severe. However, not every child with eczema has a food allergy.
In fact, unnecessary food avoidance can sometimes create nutritional problems and increase stress around eating. That’s why it’s important not to start removing multiple foods without proper medical advice.
Food intolerance or allergy?
Not every food reaction is an allergy. Food intolerances are usually linked to digestion and may cause symptoms like:
- bloating
- stomach pain
- diarrhoea.
Unlike allergies, intolerances do not involve the immune system and are generally not life-threatening.
If you’ve read our previous blog on food allergies versus intolerances, you’ll know the difference can sometimes be confusing, especially in younger children.
Should your child have allergy testing?
Not always. One common misconception is that every suspected food reaction needs allergy testing. In reality, testing is most helpful when it’s guided by a detailed medical history and symptoms.
A paediatric allergist can help determine:
- whether testing is appropriate
- which tests are most useful
- how to interpret the results correctly.
This is important because positive allergy tests do not always mean a child has a true food allergy.
What should parents do next?
If you suspect your child may have a food allergy, try to pay attention to patterns:
- what food was eaten
- how quickly symptoms appeared
- what the reaction looked like
- whether it has happened more than once.
Photos of rashes or swelling can also be helpful to show your doctor, particularly if symptoms settle quickly.
Importantly, avoid making major dietary changes without medical advice. Removing foods unnecessarily can make mealtimes more stressful and may affect your child’s nutrition.
Food allergies can change over time
Some childhood food allergies are long lasting, while others may improve as children grow older.
The key is making sure your child has the right diagnosis and management plan from the beginning. For many families, having clear answers helps replace fear and uncertainty with confidence and practical strategies.
