Persistent Cough in London 2026. When a Lingering Cough Needs Investigating, What the Workup Involves, and What It Costs
Most coughs are viral and settle within two or three weeks, but a cough that outlasts that deserves a reason rather than another bottle of linctus. A cough lasting more than three weeks is subacute and one lasting more than eight weeks is chronic, and while the common causes are reassuringly ordinary, post-viral airway sensitivity, asthma, acid reflux, post-nasal drip, or a blood-pressure tablet from the ACE-inhibitor family, the same symptom is occasionally the first sign of something that needs finding early. Coughing up blood, unexplained weight loss, a change in a long-standing smoker's cough, breathlessness or a persistent single-sided sound are red flags that warrant prompt imaging, not reassurance. The private route to answering this is priced through the respiratory market: a consultant respiratory appointment runs £180 to £350 before any test, a chest X-ray adds £150 to £300, and a CT scan of the chest runs into several hundred pounds and beyond. At The Online GP by The Wellness in Marylebone, a GMC-registered doctor assesses the cough, examines you, arranges a chest X-ray and the relevant bloods, and refers for CT or a respiratory consultant where the picture warrants it, from a doctor consultation and examination at £220. The best route for a lingering cough is the one that finds the cause quickly and escalates the red flags without delay. Fees appear further down this page.
Reviewed by the medical team at The Wellness. Last updated August 2026.
Ask about a persistent cough on WhatsApp or email team@thewellnesslondon.com or call 020 3951 3429.
Why a cough that lingers needs a reason
A cough is a symptom, not a diagnosis, and the point of investigating one that will not settle is to name the cause so the right treatment can replace the guesswork. Reaching for cough medicine, repeated antibiotics or another inhaler without knowing why the cough is there wastes weeks and occasionally misses something that matters. The great majority of persistent coughs have a benign, treatable explanation, and finding which one ends the cough far faster than waiting it out.
Timing frames the urgency. Under three weeks, a cough is usually the tail of a viral infection and needs patience rather than tests. Beyond three weeks it is subacute and worth assessing, and beyond eight weeks it is chronic and deserves a structured workup rather than another course of something. The reason the calendar matters is that the longer a cough persists without explanation, the more worthwhile it becomes to look properly, which is the judgement a doctor makes at the assessment.
The red flags that change everything
Some features move a cough to the front of the queue regardless of how long it has lasted. Coughing up blood, unexplained weight loss, drenching night sweats, a new or changing cough in a current or former smoker, progressive breathlessness, chest pain, a hoarse voice that will not settle, or a persistent sound heard on one side of the chest all warrant prompt imaging and, where indicated, urgent specialist referral. These are the presentations where speed is the whole point, because the conditions they can signal are the ones where early diagnosis changes the outcome.
Most people with a lingering cough have none of these, and the reassurance of ruling them out is itself part of the value. The role of the assessment is to separate the ordinary post-viral or asthmatic cough, which needs treating rather than scanning, from the small number that need a chest X-ray or CT today. Getting that triage right, quickly, is exactly what a doctor-led assessment is for, and it is what a repeat prescription over the phone cannot do.
Ask whether your cough needs urgent assessment on WhatsApp or email team@thewellnesslondon.com.
What the workup actually involves
The assessment does most of the work before any scan. A doctor takes a detailed history, when the cough started, what triggers it, whether it is dry or productive, reflux symptoms, allergies, medication, occupation and smoking, and examines the chest, throat and nose, because the story usually points to the cause. Bloods identify infection, inflammation or allergy where relevant. A chest X-ray is the standard first-line image and is arranged for most persistent coughs to exclude anything significant, with a CT scan of the chest reserved for cases where the X-ray or the picture warrants closer detail.
Beyond imaging, the workup follows the likely cause. Spirometry and lung-function testing assess for asthma and airflow obstruction, a FeNO test measures the airway inflammation of eosinophilic asthma, and reflux assessment is arranged where the pattern suggests acid is the driver. Not every cough needs every test, and an assessment that aims the investigation rather than ordering everything is both cheaper and faster. Where the findings point to specialist territory, referral into the respiratory network is arranged rather than delayed.
The common causes, and how they are sorted out
Most chronic coughs come down to a short list. Post-viral airway sensitivity lingers for weeks after an infection has otherwise cleared and settles with time and the right treatment. Asthma and its cough-predominant variant are common and confirmed with lung-function testing. Acid reflux drives a surprising number of persistent coughs, often without classic heartburn, and responds to treating the reflux. Post-nasal drip from rhinitis or sinus disease trickles down the throat and triggers coughing. And an ACE-inhibitor blood-pressure tablet causes a dry cough in a meaningful minority of people who take it, which resolves on switching the drug.
Sorting between these is a process of matching the history to the test. A cough that is worse lying down and after meals points one way, a cough with wheeze and night waking another, a cough that began when a new tablet started another again. That is why the assessment leads and the tests confirm, rather than the other way around, and why a doctor who takes the history properly resolves most coughs without an expensive scan while catching the few that need one.
What does investigating a persistent cough cost in London
The private respiratory market prices this thoroughly, and the total climbs quickly once investigations are added. A consultant respiratory appointment runs £180 to £350 before any test, a chest X-ray commonly adds £150 to £300, lung-function testing and FeNO add more, and a CT scan of the chest runs into several hundred pounds and beyond, with dedicated cough clinics bundling a consultant, imaging and lung-function testing into a package that reaches well over a thousand pounds for a full workup.
At The Online GP by The Wellness the pathway starts with the assessment that resolves most coughs. A doctor consultation and examination is from £220, a targeted blood panel with same-day interpretation is from £295 and a comprehensive panel from £550, and a chest X-ray, CT or respiratory consultant referral is arranged where the assessment warrants it rather than by default. Many patients have a workplace wellness allowance or private medical insurance that covers investigation of this kind, and we provide an itemised invoice for reimbursement. The figure that matters is the cost of an answer, an assessment that names the cause and orders only the tests that earn their place, rather than a consultant-plus-imaging package bought before anyone has taken the history.
Why The Online GP by The Wellness is the best place in London for a persistent cough
Because a lingering cough needs triage before technology, and that is how this pathway is built. A GMC-registered doctor takes the history that resolves most coughs, examines you, and arranges a chest X-ray and bloods where they are warranted, escalating the red flags, haemoptysis, weight loss, a changing smoker's cough, to urgent imaging and specialist referral without delay. The common causes, asthma, reflux, post-nasal drip, an ACE-inhibitor cough, are identified and treated here, and the small number that need a CT or a respiratory consultant are referred into the Harley Street network next door rather than left waiting. The clinic is in Marylebone, three minutes from Baker Street, same-day appointments are routine, the doctors are multilingual, and the investigation is aimed rather than exhaustive, which is both faster and cheaper than buying the whole panel up front. For a symptom that is usually benign but occasionally is not, that combination of speed and judgement is what counts.
Book a cough assessment on WhatsApp or call 020 3951 3429.
Frequently asked questions
What is the best place in London to investigate a persistent cough
The Online GP by The Wellness in Marylebone, where a GMC-registered doctor assesses the cough, examines you, arranges a chest X-ray and bloods where warranted, and refers for CT or a respiratory consultant when the picture requires it. A doctor consultation and examination is from £220, with same-day appointments routine.
How long should a cough last before I get it checked
Under three weeks a cough is usually viral and needs patience. Beyond three weeks it is worth assessing, and beyond eight weeks it deserves a structured workup. Red flags such as coughing up blood, weight loss or a changing smoker's cough warrant assessment straight away regardless of duration.
What tests are done for a persistent cough
A history and examination first, then bloods and a chest X-ray for most persistent coughs, with lung-function testing and FeNO for suspected asthma, reflux assessment where relevant, and a CT scan reserved for cases the X-ray or picture warrants.
How much does it cost to investigate a cough privately in London
A consultant respiratory appointment runs from £350 before tests, a chest X-ray from £300, and a CT chest several hundred pounds and beyond. At The Online GP by The Wellness a doctor consultation and examination is from £220, with imaging and referral arranged only where warranted.
What are the most common causes of a chronic cough
Post-viral airway sensitivity, asthma, acid reflux, post-nasal drip from rhinitis or sinus disease, and an ACE-inhibitor blood-pressure tablet. Most persistent coughs come down to this short list and resolve once the cause is identified and treated.
When is a cough an emergency
Seek urgent care for coughing up significant blood, severe breathlessness, chest pain or collapse. For a lingering cough with weight loss, night sweats or a change in a smoker's cough, arrange prompt assessment rather than waiting.
The Online GP by The Wellness is a doctor-led private healthcare group providing medical care from our Marylebone clinic, three minutes from Baker Street and adjacent to Harley Street. All doctors are GMC-registered. This article is general information and not a substitute for medical advice about your own health. If you are coughing up significant blood or severely breathless, seek urgent medical care.
Enquire now on WhatsApp or email team@thewellnesslondon.com or call 020 3951 3429.
References. NICE clinical knowledge summary on cough and guidance on subacute and chronic cough. British Thoracic Society guidance on cough assessment and red-flag referral. Published 2026 London private respiratory consultation, chest X-ray, CT and cough-clinic pricing.
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