Almost everyone has had a cough that outstayed its welcome. A chest infection in February, and by April you are still clearing your throat at the end of every sentence. Usually it settles. But when a cough has been rattling around for two months, it stops being a leftover from a virus and becomes something worth investigating.
People in their 50s, 60s and 70s often put a persistent cough down to age. A cough is a symptom, not a diagnosis, and after 50 it deserves a proper look rather than another bottle of linctus.
TL;DR
- A cough lasting more than eight weeks is chronic and needs assessment, not just cough bottles.
- HSE lung cancer referral guidance is stricter: any new cough beyond three weeks, or a change in a long-standing cough, warrants an urgent chest X-ray.
- Three causes account for most chronic coughs: upper airway cough syndrome (postnasal drip), asthma-type airway inflammation, and reflux. Two or more often occur together.
- ACE inhibitor blood pressure tablets cause a dry cough in 5 to 35 per cent of users and can start months or years in. Never stop the tablet yourself: ask your GP about switching.
- Red flags (coughing blood, weight loss, breathlessness, hoarseness over three weeks) mean a same-week GP appointment. Rapid Access Lung Clinics aim to assess urgent referrals within about ten working days.
What actually counts as a chronic cough
Doctors divide coughs by duration. Under three weeks is acute, usually viral. Three to eight weeks is subacute, often the tail end of an infection where the airways stay twitchy after the bug has gone. Beyond eight weeks is chronic, and that line is the threshold for a full diagnostic work-up.
It is not the threshold for seeing your GP. HSE lung cancer rapid access referral guidance uses a much shorter fuse: a new, unexplained or persistent cough beyond three weeks, or any change in the character of a cough you have had for years, should prompt an urgent chest X-ray. Three weeks is when you make the appointment. Eight weeks is when the search for a cause becomes systematic.
The three usual suspects
Upper airway cough syndrome, still widely called postnasal drip, is mucus from the nose and sinuses trickling down the back of the throat and irritating the cough receptors. It comes with throat-clearing, a dripping sensation and a worse cough on lying down. Sinus problems become more common with age, and many people never connect their nose to their cough.
Asthma and related airway inflammation can present as cough alone, with no wheeze and no breathlessness, sometimes called cough-variant asthma. Late-onset asthma genuinely does begin after 50, more often in women, and is regularly missed because it does not look like the childhood version.
Reflux is the trickiest, because many people with reflux-related cough have no heartburn at all. Stomach contents reach the upper airway and irritate it, typically worse after meals, on bending forward and at night.
These do not politely take turns. Chronic cough clinics find two or more causes in 18 to 62 per cent of patients, which is why treating one thing, improving a bit and giving up is such a common trap. Treatments are layered, not swapped.
Check the medicine cabinet first
If you take an ACE inhibitor for blood pressure or heart failure (ramipril, lisinopril, enalapril and perindopril are commonly prescribed in Ireland, all ending in “pril”), that tablet is a prime suspect. ACE inhibitors cause a persistent dry, tickly cough in 5 to 35 per cent of people who take them.
The timing is what catches people out. The cough can begin within days, or appear a year or more into treatment, which makes the connection easy to miss. Once stopped, it usually settles within one to four weeks. Do not stop a blood pressure tablet on your own: ring your GP, mention the cough, and ask about switching. A closely related class, the ARBs (candesartan, losartan, valsartan), does the same job without the cough.
Red flags: when to ring the surgery this week
- Coughing up blood, even a small streak, even once
- Unexplained weight loss or loss of appetite
- New or worsening breathlessness
- Chest or shoulder pain with no obvious muscular cause
- Hoarseness lasting more than three weeks
- Difficulty swallowing, or coughing while eating and drinking
- Repeated chest infections in the same area
Ireland’s National Cancer Control Programme runs Rapid Access Lung Clinics at the designated cancer centres. Your GP refers directly, and they aim to assess patients within roughly ten working days, with CT scanning and bronchoscopy arranged in one or two visits. The system only works if people present, and a cough that has been “grand, just a bit of a cough” since Christmas is exactly what it exists to catch.
What happens at the GP
Expect a detailed history, the most valuable part of the visit. Bring the answers to: how long, wet or dry, worse when, what triggers it, what medicines you take, whether you ever smoked, and any dust or fume exposure from a working life that ended decades ago but still counts. A chest X-ray is standard and spirometry often added. Your GP may then trial a nasal steroid spray, an inhaler or acid suppression, each given several weeks rather than days. If you have COPD or asthma, structured reviews are free through the HSE Chronic Disease Management Programme. Two under-recognised causes in older adults are bronchiectasis and swallowing difficulty, both manageable once identified and both routinely mistaken for “just getting older”.
When no cause is found
In some people the work-up comes back clean and the cough continues. This is refractory chronic cough, now understood as cough hypersensitivity: the nerve pathways controlling the cough reflex become oversensitive, so ordinary triggers like cold air, perfume, laughing or talking on the phone set off a fit. It is a real physical condition, not a nervous habit, which matters to anyone made to feel their cough is imaginary.
European Respiratory Society guidance supports speech and language therapy based cough control therapy as a first-line option: cough suppression techniques, breathing retraining and trigger management, with randomised trials showing reduced cough frequency and sensitivity. Therapists in Ireland are registered with CORU, and both HSE community services and private practitioners offer it. Low-dose medicines that dampen nerve signalling are sometimes used off-label, and gefapixant is licensed in the EU for refractory chronic cough. Both are consultant decisions, not GP prescriptions.
Practical things that help while you wait
Stop smoking if you still do: cough improves within weeks of quitting, and the HSE Quitline (1800 201 203) provides free support and free nicotine replacement therapy at any age. Sip water rather than clearing your throat, which is itself an irritant that feeds the cycle. If reflux is suspected, stop eating three hours before bed and raise the head of the bed. Keep the home ventilated, mind damp and solid fuel smoke, and stay up to date with flu, COVID and pneumococcal vaccination.
At Críonna Health we write about ageing as something to be managed actively rather than endured quietly, and a chronic cough is a good example of why. It is easy to normalise, and it is one of the symptoms most reliably blamed on age when it is actually something treatable. Eight weeks is the medical definition. Three weeks is the phone call.
This article is general information, not medical advice. If you are concerned about a persistent cough, speak to your GP.
📷 Photo by Tatiana Zanon on Unsplash
