Skip to main content

Rare lung & airway condition

Vocal cord dysfunction / inducible laryngeal obstruction

Vocal cord dysfunction - now termed inducible laryngeal obstruction (ILO) - is inappropriate closing of the vocal cords during breathing, causing attacks of breathlessness and noisy inspiration frequently mistaken for asthma.

Key points

The essentials at a glance.

What to look out for, how the diagnosis is confirmed, who looks after it, and the options that exist.

  • 01

    Key features: sudden-onset attacks, breathing in harder than breathing out, tightness felt at the throat, and poor response to asthma inhalers.

  • 02

    Triggers include exercise, strong smells, reflux, post-nasal drip and stress.

  • 03

    Diagnosis is confirmed by seeing the cords close on laryngoscopy, ideally during a provoked episode (or exercise testing).

  • 04

    Speech and language therapy - breathing retraining - is the core treatment and is highly effective.

  • 05

    It commonly coexists with true asthma; both need treating, and unnecessary steroid escalation should be wound back.

Understanding it

What it is, and what happens next.

In plain English - what is going on, how specialists confirm it, and the routes to treatment in the UK.

The vocal cords should swing open with every breath in; in ILO they paradoxically close, narrowing the airway at the throat. Attacks are frightening and dramatic - noisy inspiration, a feeling of strangling - and they populate emergency departments and severe-asthma clinics, where oral steroid courses accumulate for a condition that steroids cannot treat.

The pathway that works is direct visualisation - laryngoscopy during provocation, increasingly with exercise laryngoscopy for sport-related symptoms - followed by respiratory speech and language therapy teaching rescue and preventative breathing techniques, alongside management of reflux, nasal disease and anxiety amplifiers, and a careful audit of asthma treatment so that only genuine asthma remains treated. In many parts of the UK, routine NHS outpatient referrals for problems like this can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist knows your history and can tell you which parts apply to you. If in doubt, speak to them.

Published 2026-09-27 · Next review 2027-09-27

Frequently asked

Common questions about Vocal cord dysfunction / inducible laryngeal obstruction.

Quick, plain-English answers to what people ask us most.

  • What is vocal cord dysfunction (inducible laryngeal obstruction)?

    It is a condition in which the vocal cords close inappropriately during breathing, particularly on breathing in, causing symptoms that can mimic asthma, such as breathlessness and noisy breathing.

  • What causes vocal cord dysfunction?

    Triggers include exercise, strong odours, stress or anxiety, acid reflux, and postnasal drip; the underlying mechanism involves an abnormal reflex causing the vocal cords to close inappropriately during breathing.

  • What are the symptoms of vocal cord dysfunction?

    A sudden feeling of throat tightness, difficulty breathing in (rather than out, which is more typical of asthma), a noisy, high-pitched sound when breathing in, and a sensation of choking, often triggered by exercise or specific irritants.

  • Is vocal cord dysfunction dangerous?

    It isn't typically dangerous, but the sensation of breathing difficulty can be frightening, and it's important to distinguish it from asthma or other causes of breathing difficulty since the treatment approach differs.

  • Can vocal cord dysfunction be treated?

    Yes, speech and language therapy focused on specific breathing techniques is highly effective for many people, along with addressing any contributing triggers such as reflux or anxiety.

  • How is vocal cord dysfunction treated?

    Treatment centres on specialist speech and language therapy teaching breathing retraining techniques, alongside managing any identified triggers like acid reflux, postnasal drip, or anxiety.

  • How long does treatment take to work?

    Many people notice improvement within a few sessions of specific breathing retraining therapy, though ongoing practice of these techniques helps maintain control, particularly during triggering situations like exercise.

  • Vocal cord dysfunction vs asthma - what's the difference?

    Vocal cord dysfunction typically causes difficulty breathing in with noise from the throat, doesn't respond to asthma inhalers, and often has a specific trigger pattern, while asthma typically causes difficulty breathing out with wheeze from the chest and responds to bronchodilator inhalers; the two can sometimes coexist, making specific testing important.

  • When should I see a specialist about breathing symptoms, and how quickly can I be seen privately?

    See an ENT specialist or respiratory physician, ideally with access to speech and language therapy, if you have symptoms suggestive of vocal cord dysfunction. NHS waits can be lengthy; private specialists can often see you within about two weeks.