Childhood asthma

Overview

Asthma is a long-term condition that affects the airways – the tubes that carry air in and out of the lungs. In childhood asthma, these airways can become swollen, narrow, and produce extra mucus, making it hard to breathe. It often starts in early childhood and can be triggered by things like colds, dust, pollen, or exercise.

Yes, childhood asthma is very common. It affects millions of children around the world and is the leading chronic condition among children.

Asthma can start at any age, but it often begins in early childhood, usually before age 5. It affects both boys and girls, though boys are slightly more likely to have asthma in childhood.

Symptoms

Common symptoms

• Wheezing – a whistling sound when breathing out
• Coughing – especially at night, during exercise, or when laughing
• Shortness of breath – feeling like you can't get enough air
• Chest tightness – a feeling of pressure or squeezing in the chest

Symptoms in children

• Rapid breathing or panting
• Trouble feeding or sucking in infants
• Tiredness from struggling to breathe
• Less interest in play or activity

Causes

Main causes

• The exact cause is not fully known, but asthma is usually a mix of genetic and environmental factors.
• Inflammation and swelling of the airways make them sensitive to triggers.
• Common triggers include colds and viral infections, dust mites, pollen, pet fur, smoke, cold air, and exercise.

Risk factors

• Family history – having a parent or sibling with asthma, allergies, or eczema
• Personal history of allergies or eczema
• Born prematurely or with low birth weight
• Exposure to tobacco smoke before or after birth

When to see a doctor

See a doctor urgently if:

• If your child is having a severe asthma attack (see emergency symptoms above), call emergency services immediately.
• If your child's symptoms are not getting better after using their reliever inhaler, seek urgent care on the same day.

Book a routine appointment if:

• When you first notice asthma-like symptoms – such as wheezing, coughing, or breathlessness – make a routine appointment.
• For regular check-ups every few months to review the asthma action plan and adjust medicines.
• If symptoms change or worsen over time, even if not an emergency.

Diagnosis

Diagnosing asthma in children can be tricky because symptoms are similar to other illnesses. Doctors usually diagnose based on your child’s symptoms, medical history, how they respond to treatment, and simple breathing tests if the child is old enough to do them.

Tests that may be done

• Lung function tests (spirometry) – blowing into a machine to measure how well the lungs work (usually for children over 5)
• Peak flow meter – a handheld device that measures how fast your child can blow air out
• Allergy tests – to see if common allergens trigger symptoms

What to expect at your appointment

Your doctor will ask about when and where symptoms happen, any family history, and what seems to trigger attacks. They may watch your child breathe, listen to their chest, and sometimes ask them to try a reliever inhaler to see if it helps. The process may take several visits to confirm the diagnosis.

Treatment

The goal of asthma treatment is to control symptoms, prevent attacks, and allow your child to enjoy daily activities without limits. Treatment usually involves avoiding triggers, using inhalers correctly, and following a written asthma action plan made with your doctor.

Self-care at home

• Identify and avoid triggers – such as dust, pollen, pets, or smoke
• Use inhalers exactly as prescribed – both the reliever (for quick relief) and the preventer (to reduce swelling in the airways)
• Monitor symptoms with a peak flow meter if your child is old enough
• Keep an asthma diary – note when symptoms happen and what triggered them

Medical treatments

The main treatments are inhalers. There are two main types: a reliever inhaler (usually blue) that quickly opens the airways during an attack, and a preventer inhaler (often brown or red) that is taken daily to keep airways calm and reduce swelling. For some children, a combination inhaler or additional medicines may be recommended. All inhalers work best when used with a spacer device (a plastic chamber that helps the medicine reach the lungs). Your doctor will explain the correct technique.

Living with this condition

With good management, children with asthma can live full, active lives. The key is to have a clear asthma action plan, keep all medicines within reach, and make sure teachers, caregivers, and coaches know what to do if symptoms flare. Many children learn to use their own inhaler with supervision.

Lifestyle tips

• Encourage regular physical activity – it strengthens the lungs. Sometimes a pre-exercise puff of the reliever inhaler helps prevent symptoms.
• Keep the home free of dust, mold, and pet dander by cleaning regularly and washing bedding in hot water.
• Avoid smoking near the child entirely – smoke is a strong trigger.

Diet and exercise

A healthy, balanced diet supports overall health, though no specific diet can cure asthma. Exercise is very important – most children with asthma can play sports and be active. Warming up before exercise and using a reliever inhaler beforehand can help prevent exercise-induced symptoms. If exercise always triggers symptoms, talk to the doctor about adjusting the asthma plan.

Mental health and emotional wellbeing

Living with a long-term condition can sometimes make children feel anxious, frustrated, or 'different'. They may worry about having an attack at school or being left out. It helps to talk openly with your child, remind them they are not alone, and involve them in their own care. If worries affect their mood or daily life, speak to a healthcare provider or school counsellor for support.

Prevention

Childhood asthma cannot be completely prevented, but you can reduce the risk of attacks and long-term damage by managing triggers well and following the treatment plan. Some studies suggest that exposing babies to a variety of environments and avoiding tobacco smoke may help lower the chance of developing asthma.

Complications

If left untreated

• Frequent and severe asthma attacks that may require emergency treatment or hospital stays
• Missed school days and reduced ability to play or exercise
• Long-term changes in lung function that could lead to persistent breathing problems

Long-term outlook

The outlook for childhood asthma is generally positive. With proper treatment and a good action plan, most children can fully control their symptoms. Many children see their asthma become milder or even go away as they get older and their lungs grow stronger. Staying in regular contact with your healthcare provider helps keep your child on the right track.

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