Health condition
Cough-variant asthma
In cough-variant asthma the only symptom is a dry, persistent cough - no wheeze, no breathlessness - which is why it hides for months; it responds to standard asthma treatment once someone thinks to test for it.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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The pattern: a dry cough lasting weeks to months, often worse at night, after exercise, or with cold air, laughter or smoky atmospheres
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Standard examination and even spirometry may be normal - tests of airway inflammation (FeNO) or hyperresponsiveness clinch it
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Treatment is regular inhaled corticosteroid, with response expected within a few weeks - a successful treatment trial doubles as confirmation
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Specialist: a consultant respiratory physician; untreated cough-variant asthma can progress to classic asthma in a proportion of people
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
A cough that lingers for months, punctuates the night, and flares with exercise, cold air and laughing fits - while every chest examination is pronounced normal - is the signature of cough-variant asthma, one of the three great causes of chronic cough alongside reflux and upper airway cough syndrome. The airway inflammation and twitchiness of asthma are present, but expressed almost entirely through the cough reflex rather than through wheeze or measurable airflow obstruction, which is precisely why routine tests keep coming back reassuring while the cough persists.
Diagnosis and treatment routes
The diagnostic route runs through tests that detect airway inflammation or hyperresponsiveness - a raised exhaled nitric oxide, blood eosinophils, peak-flow variability, or a positive challenge test where available - or, pragmatically, a properly conducted trial of inhaled corticosteroid for six to eight weeks with the response documented. Effective treatment mirrors classic asthma: daily inhaled steroid with good technique, adding a long-acting bronchodilator or montelukast where needed, and reviewing triggers; the cough typically melts away over weeks, and continuing treatment protects against recurrence and progression. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant respiratory physician. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Cough-variant asthma.
Quick, plain-English answers to what people ask us most.
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What is cough-variant asthma?
Cough-variant asthma is a form of asthma where the only symptom is a dry, persistent cough, without the wheeze or breathlessness typically associated with asthma - which is exactly why it can be missed or dismissed for a long time.
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What causes cough-variant asthma?
It shares the same underlying airway inflammation and hyper-responsiveness as typical asthma, triggered by factors such as allergens, cold air, exercise, or respiratory infections, but manifests through cough rather than wheeze.
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What are the symptoms of cough-variant asthma?
The defining symptom is a dry, often night-time or exercise-induced cough lasting weeks, with no wheeze or obvious breathlessness. It's often worse with exposure to cold air, allergens, or after exercise.
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Is cough-variant asthma dangerous?
It's generally not dangerous, but it can significantly affect quality of life and sleep if unrecognised and untreated, and, like other asthma, carries a small risk of progressing to more typical asthma symptoms over time.
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How is cough-variant asthma diagnosed?
Diagnosis usually involves specific tests such as spirometry with a bronchodilator response, or a peak flow diary, sometimes alongside a trial of asthma treatment to see if the cough responds - since standard chest X-rays and examinations are often normal.
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How is cough-variant asthma treated?
Treatment mirrors standard asthma treatment: typically an inhaled corticosteroid, sometimes combined with a bronchodilator, which controls the underlying airway inflammation responsible for the cough.
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How long does it take for treatment to work?
Many people notice improvement in their cough within a few weeks of starting inhaled treatment, though it can occasionally take longer to fully settle, and treatment is often continued for some time to prevent recurrence.
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Cough-variant asthma vs chronic cough from other causes - how do you tell them apart?
Cough-variant asthma is suggested by a cough that responds to asthma treatment and abnormal breathing tests, whereas other causes of chronic cough (like reflux or postnasal drip) have their own distinguishing features and treatments. Because the causes overlap in presentation, proper testing is the most reliable way to differentiate them.
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Can cough-variant asthma be cured?
It can't always be permanently cured, but it is usually very well controlled with appropriate inhaled treatment, and many people are able to significantly reduce or eliminate symptoms long-term with consistent management.
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When should I see a doctor about a cough that might be asthma?
See a doctor if you have a dry cough lasting several weeks, particularly if it's worse at night or with exercise. A private respiratory or allergy specialist can often see you within about two weeks, compared with longer waits for a routine NHS referral.