My Child Struggles to Breathe During Sport — Could It Be Their Voice Box Rather Than Asthma?
Your child enjoys football, swimming or running.
They are usually healthy and active.
However, during PE lessons or competitive sport, something unusual happens.
They suddenly stop exercising.
They appear breathless.
They may describe a tight feeling in their throat.
Sometimes you hear a high-pitched noise when they breathe in.
After a few minutes of rest, their breathing returns to normal.
Perhaps they have already been assessed for asthma.
Maybe they have been prescribed an inhaler, but the symptoms continue.
Naturally, parents begin wondering:
“Why does my child struggle to breathe during sport?”
“Could this be asthma?”
“Why does their throat feel tight?”
“Should they stop exercising?”
One possible explanation is exercise-induced laryngeal obstruction (EILO).
This condition is increasingly recognised in children and teenagers who experience breathing difficulties during vigorous exercise.
What is exercise-induced laryngeal obstruction?
EILO is a condition in which the larynx, or voice box, narrows temporarily during exercise.
The larynx sits in the neck, above the windpipe.
It contains the vocal folds and other structures that help regulate airflow, produce voice and protect the airway during swallowing.
During normal breathing, the larynx opens to let air pass freely to the lungs.
During EILO, part of the larynx narrows when it should remain open.
This can make breathing in feel difficult.
The narrowing usually improves when the exercise stops.
Is EILO the same as vocal cord dysfunction?
The terms are related but not identical.
Vocal cord dysfunction is an older term commonly used to describe inappropriate vocal fold movement during breathing.
The broader term inducible laryngeal obstruction describes temporary narrowing involving the vocal folds or structures above them.
When vigorous exercise triggers this narrowing, it is called exercise-induced laryngeal obstruction.
Some children have narrowing mainly at the vocal-fold level.
Others have narrowing above the vocal folds.
This distinction may influence treatment.
Why does EILO happen?
The exact mechanism is not completely understood.
During vigorous exercise, the body needs more oxygen and airflow increases considerably.
In susceptible individuals, structures within the larynx may move inward instead of staying sufficiently open.
This creates resistance to airflow.
The child may experience sudden breathlessness, throat tightness or noisy inspiration.
Factors such as breathing patterns, airway anatomy and exercise intensity may contribute.
However, EILO should not automatically be attributed to anxiety.
The symptoms are genuine and can be very distressing.
What symptoms should parents recognise?
Children with EILO may describe difficulty getting air into their lungs.
They may complain that their throat is closing or tightening.
Some develop a high-pitched breathing noise, particularly on inhalation.
This sound is called stridor.
Other symptoms can include coughing, chest discomfort, or a choking sensation.
Symptoms often become more noticeable as exercise intensity increases.
A characteristic feature is that breathing may improve relatively quickly after stopping exercise.
However, these symptoms are not exclusive to EILO.
Other respiratory and cardiovascular conditions must also be considered.
How is EILO different from asthma?
This is one of the most important distinctions for parents.
Asthma involves inflammation and narrowing of the airways within the lungs.
EILO involves narrowing of the upper airway at the level of the voice box.
Children with exercise-induced bronchoconstriction may cough, wheeze, feel chest tightness, or feel breathless during or after exercise.
In EILO, symptoms often occur during peak exercise and may be particularly noticeable on inhalation.
The distinction is not always straightforward.
Cambridge University Hospitals' guidance on exercise-induced bronchoconstriction, approved on 28 May 2026, explains how lower-airway narrowing can cause exercise-related symptoms in children. Cambridge University Hospitals
Can a child have both asthma and EILO?
Yes.
Having EILO does not exclude asthma.
Some children have both conditions.
This matters because an asthma inhaler may reduce airway narrowing without preventing EILO symptoms.
Equally, a child with genuine asthma should not stop prescribed treatment simply because EILO is being considered.
A careful assessment may be required to identify whether one or both conditions are present.
Why might an asthma inhaler not help?
Asthma medicines are designed to treat inflammation or narrowing in the airways of the lungs.
They do not directly correct inappropriate narrowing of the larynx.
Therefore, a child whose symptoms are primarily caused by EILO may notice limited benefit from asthma medication.
However, a poor response to an inhaler does not prove EILO.
Incorrect inhaler technique, inadequate asthma control and other conditions may also explain persistent symptoms.
Change medication only after an appropriate clinical review.
Is EILO common in teenagers?
EILO is increasingly recognised among adolescents and young athletes.
A paediatric review published in 2023 estimated that EILO affects approximately 5.7–7.5% of the general population studied, with higher reported rates among young athletes referred for exercise-related breathing difficulties. PubMed
These figures should not be interpreted as the prevalence among all children in London or Essex.
Nevertheless, they demonstrate that EILO is an important consideration when assessing exercise-related breathlessness.
Can EILO affect school sport?
Yes.
Some children begin avoiding PE lessons because they worry about another episode.
Others stop participating in football, swimming, athletics or competitive running.
This can affect confidence, fitness and enjoyment of physical activity.
A child may feel embarrassed if classmates notice noisy breathing.
Parents and teachers should take the symptoms seriously without assuming that the child is simply unfit or anxious.
The aim is to establish the diagnosis and support safe participation in appropriate activities.
How is EILO diagnosed?
Assessment begins with a detailed history.
The clinician will ask when symptoms occur, how quickly they develop and whether breathing in or breathing out is more difficult.
They may ask about coughing, wheezing, throat tightness, chest pain and recovery after exercise.
Previous asthma diagnoses and responses to inhalers are also important.
Depending on the history, the child may need lung-function testing, assessment by a paediatric respiratory specialist, or a larynx examination.
No single symptom confirms EILO.
What is continuous laryngoscopy during exercise?
Continuous laryngoscopy during exercise, abbreviated to CLE, is a specialised investigation.
A small flexible camera is passed through the nose to examine the larynx.
The camera is held in position while the patient exercises on a treadmill or exercise bike.
This allows clinicians to observe what happens to the larynx as exercise intensity increases.
It is particularly useful because EILO may not be visible when the child is resting.
The Royal Brompton Hospital information about continuous laryngoscopy during exercise explains how the test is performed.
CLE is regarded as the reference diagnostic test for EILO, although it is not available in every hospital.
Does every child need this test?
No.
Select the investigation based on the clinical history and the availability of specialist services.
Some children first require assessment for asthma or other causes of exercise-related breathlessness.
Lung-function tests may include spirometry and airway inflammation measurements.
The NICE NG245 asthma guideline, published on 27 November 2024, recommends objective testing when asthma is suspected.
The guideline supports the differential diagnosis but is not a dedicated EILO management guideline.
How is EILO treated?
Treatment usually begins with education and non-surgical approaches.
Many children benefit from learning how the larynx behaves during exercise.
Specialist speech and language therapists or physiotherapists may teach breathing-control techniques.
These aim to improve breathing coordination and reduce inappropriate laryngeal narrowing.
Treatment should be individualised and delivered by clinicians familiar with the condition.
No single breathing exercise suits every child.
Can breathing exercises help?
They may help some children.
A study published in March 2025 evaluated a structured speech therapy programme in 28 patients with EILO.
Following treatment, the researchers reported improved laryngoscopic findings and reduced exercise-related symptoms in many participants.
However, this was not a randomised controlled trial, and improvement cannot be guaranteed. PubMed
Breathing techniques are generally introduced gradually and practised under appropriate supervision.
They should not replace emergency treatment when a child has severe breathing difficulty.
Does EILO require surgery?
Usually not.
Most children are initially managed without surgery.
However, a small group of carefully selected patients with significant supraglottic obstruction may be considered for specialist surgical assessment.
An August 2026 randomised controlled trial investigated different surgical approaches in patients whose symptoms persisted despite conservative treatment.
The findings suggest that one form of supraglottoplasty may improve outcomes in selected patients.
However, the study was relatively small, and the findings should not be applied automatically to children.
Surgery is not routine treatment for every child with EILO. PubMed
What should parents do during an episode?
If your child develops breathing difficulty during exercise, they should stop the activity.
Encourage them to rest in a comfortable upright position.
Stay calm and reassure them while you assess their breathing.
If they have prescribed asthma medication and an asthma action plan, follow the instructions provided by their treating team.
Do not force the child to continue exercising.
Do not assume that every episode is EILO, particularly if the diagnosis has not been established.
If symptoms are severe, prolonged or unusual, seek urgent medical help.
When should parents seek emergency help?
Call 999 immediately if your child has severe breathing difficulty, cannot speak normally because of breathlessness, becomes blue or grey around the lips, collapses, becomes confused or is difficult to wake.
Chest pain associated with collapse or significant breathing difficulty also requires emergency assessment.
Seek urgent medical advice for recurrent unexplained breathlessness, fainting during exercise, persistent chest pain or symptoms that do not settle promptly after stopping activity.
The NHS guidance on shortness of breath provides further emergency safety advice.
When should my child see an ENT specialist?
Consider medical assessment if your child repeatedly develops throat tightness, noisy inspiration or breathlessness during exercise.
Assessment is particularly important when symptoms interfere with school sport, occur despite appropriate asthma treatment or remain unexplained after initial respiratory investigations.
A paediatric respiratory specialist may need to assess the child before or alongside ENT review.
For families across London, East London, Romford, Ilford, Redbridge, Woodford, Brentwood and Chelmsford, the priority is establishing whether the symptoms originate in the lungs, larynx or another system.
Mr Gaurav Kumar, Consultant ENT Surgeon, has a specialist interest in paediatric ENT and laryngology.
The key message for parents
Breathing difficulties during sport can frighten children and families.
Asthma is a possible cause, but it is not the only explanation.
Exercise-induced laryngeal obstruction can cause throat tightness, noisy breathing and difficulty breathing in during vigorous activity.
Many children can benefit from appropriate assessment and non-surgical treatment.
If your child repeatedly struggles to breathe during sport, particularly with throat tightness or noisy inspiration, arrange medical assessment rather than assuming it is always asthma.
FREQUENTLY ASKED QUESTIONS
1. What is exercise-induced laryngeal obstruction?
EILO is temporary narrowing of the voice box during exercise. It can cause difficulty breathing in, throat tightness and noisy breathing.
2. Can EILO be mistaken for asthma?
Yes. Both conditions can cause breathlessness during sport. However, EILO involves the larynx, while asthma affects the airways within the lungs.
3. Why doesn't my child's asthma inhaler help during exercise?
EILO may not respond to asthma medication because the narrowing occurs in the voice box. However, inhaler technique, asthma control and other causes should also be reviewed.
4. Can my child have both asthma and EILO?
Yes. The two conditions can coexist. Children with suspected EILO should not stop prescribed asthma treatment without medical advice.
5. How is EILO diagnosed?
Assessment involves a detailed history and consideration of respiratory investigations. Continuous laryngoscopy during exercise can directly demonstrate laryngeal narrowing during exertion.
6. Can breathing exercises improve EILO?
Specialist breathing-control therapy may help some children. Evidence is encouraging but remains limited, and outcomes vary.
7. Does my child need surgery?
Usually not. Surgery is considered only for carefully selected patients with significant obstruction that has not responded adequately to conservative management.
8. Should my child stop playing sport?
A child with unexplained breathing difficulties should stop exercising during an episode and receive appropriate assessment. Many children can return to physical activity with an individualised management plan. Do not ignore severe or unexplained symptoms.
Disclaimer: This information is intended for general educational and regional SEO purposes only and does not replace personalised clinical advice. For a definitive structural evaluation, you need a face-to-face consultation with a registered specialist.
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