Chronic Cough

A chronic cough is a cough that lasts for more than eight weeks. It is a very common and often very frustrating symptom. Some patients describe a dry tickly cough. Others feel constant irritation in the throat, repeated throat clearing, or a cough triggered by talking, laughing, cold air, strong smells, or changes in temperature. Chronic cough can affect sleep, work, social confidence, and quality of life.

I see many patients with chronic cough, but one of the most important principles is that it should not automatically be assumed to be an ENT problem. A chest cause always needs to be considered carefully and, in many patients, a respiratory review is an important part of the assessment.

What do patients usually mean by chronic cough?

Patients describe this symptom in different ways. Common descriptions include:

  • a dry tickly cough

  • repeated throat clearing

  • a cough triggered by talking or laughing

  • coughing in cold air or around perfume, smoke, or other irritants

  • a cough that is worse at night or first thing in the morning

  • a sensation of mucus in the throat

  • a cough that started after an infection and never really settled

  • a cough with a constant urge to clear the throat

  • coughing or choking when eating and drinking

The pattern matters. A dry, irritable cough with clear triggers often suggests cough hypersensitivity or laryngeal sensitivity. A wet or productive cough, breathlessness, wheeze, chest tightness, or recurrent chest infections makes a chest cause more likely and often points towards respiratory review. Cough that happens with food or drink raises a different possibility: a swallowing problem with small amounts going down the wrong way.

Why is it important to rule out a chest cause?

This is one of the most important parts of assessing chronic cough.

Although chronic cough can come from the throat and upper airway, it can also be caused by asthma, other airway disease, smoking-related lung disease, bronchiectasis, infection, medication, or other chest conditions. That is why it should not simply be labelled as throat irritation without proper consideration of chest causes first.

A respiratory review is often needed to investigate this properly, particularly if there is breathlessness, wheeze, chest tightness, a productive cough, abnormal chest findings, recurrent chest infections, a history of smoking, or if the cough is not settling despite treatment of likely ENT or reflux-related causes.

What can cause chronic cough?

There is no single cause. In many patients, more than one factor is contributing at the same time.

Chest and airway causes

These include asthma, cough-variant asthma, chronic obstructive pulmonary disease, bronchiectasis, infection, and other lower airway conditions. In some patients, the cough is mainly respiratory rather than ENT-related.

Rhinitis and post-nasal drip

Nasal inflammation and post-nasal drip can irritate the throat and trigger coughing or throat clearing. In some patients this is an important part of the picture, although it is worth remembering that the sensation of mucus in the throat does not always mean the problem is truly coming from the nose. I discuss this in more detail on my separate post-nasal drip page.

Laryngopharyngeal reflux

Reflux can irritate the throat and voice box and cause chronic cough even without classic heartburn.

Smoking

Smoking is an important and sometimes overlooked factor. It can drive chronic cough directly through airway irritation and chronic bronchitis. Stopping smoking often improves cough, although some patients notice a temporary worsening when they first stop.

Obesity

Obesity can also be relevant. It may contribute through reflux and obstructive sleep apnoea, both of which can worsen chronic cough. In some patients, weight loss forms part of the overall treatment plan.

ACE inhibitor medication

ACE inhibitors are a well-recognised cause of chronic cough in some patients. Common examples include ramipril, lisinopril, perindopril, and enalapril. If the cough started after one of these medicines was introduced, that possibility needs to be considered.

Post-viral cough

Some coughs begin after a cold, throat infection, or chest infection and then persist long after the original illness has settled.

Laryngeal sensitivity or cough hypersensitivity

In some patients, the nerves involved in cough become over-sensitive. This is often called cough hypersensitivity or laryngeal hypersensitivity. Harmless triggers such as cold air, talking, laughing, perfume, dry air, or mild throat irritation can then trigger coughing out of proportion to the stimulus.

Vocal cord palsy

Vocal cord palsy means that one of the vocal cords is not moving properly. This can affect the voice, but it can also affect swallowing and airway protection. Some patients cough particularly with liquids because food or drink can slip towards the airway more easily if the vocal cord is not closing properly.

Swallowing problems and small aspiration

Swallowing problems can also cause chronic cough. Dysphagia means difficulty swallowing. If food, drink, or saliva goes into the airway instead of down the food pipe, this is called aspiration. Patients may notice coughing or choking when eating or drinking, a wet or gurgly voice after swallowing, repeated throat clearing, or recurrent chest infections.

What is laryngeal sensitivity?

Laryngeal sensitivity means the voice box and surrounding upper airway have become too sensitive. This may happen after an infection, reflux, repeated coughing, post-nasal drip, allergy, irritant exposure, or sometimes with no clear starting point. Once that cycle becomes established, coughing itself causes more irritation, which then leads to more coughing.

Patients with laryngeal sensitivity often describe a tickle, irritation, tight feeling, or the sense that the cough comes from the throat rather than the chest. Typical triggers include talking, laughing, cold air, smells, dryness, stress, and exertion.

When should chronic cough raise concern?

Chronic cough is usually not caused by cancer, but some symptoms do need more urgent attention.

Red flags include:

  • coughing up blood

  • unexplained weight loss

  • persistent breathlessness

  • chest pain

  • a persistent change in the voice

  • recurrent or persistent chest infections

  • fevers or night sweats

  • a persistent cough in a smoker or former smoker, especially over the age of 40

These features do not automatically mean something serious is going on, but they do mean proper investigation is important.

How is it investigated?

The first step is a careful history. I want to understand how long the cough has been present, whether it is dry or productive, what triggers it, whether there is wheeze, breathlessness, reflux, nasal symptoms, throat clearing, hoarseness, medication use, smoking, weight-related reflux symptoms, or a history suggesting swallowing difficulty.

From an ENT point of view, I examine the nose, throat, and ears, and in many patients I perform a flexible nasendoscopy to assess the throat and voice box. This can be helpful in identifying throat irritation, mucus, signs of reflux, vocal fold problems, or other upper airway causes.

But ENT assessment is only one part of the picture. For chronic cough, chest assessment is often just as important. Many patients need a respiratory review to investigate possible chest causes properly. Depending on the history, further assessment may involve chest imaging, lung function testing, reflux assessment, swallow assessment, or speech and language therapy assessment for cough hypersensitivity.

If coughing happens with eating and drinking, or there is concern about aspiration, additional assessment may include FEES or a video swallow study. These tests help assess whether food or drink is entering the airway and whether swallowing strategies are needed.

What treatments help?

Treatment depends on the cause.

Treating the underlying driver

If the cough is being driven by asthma or another chest condition, that needs proper respiratory treatment. If rhinitis, post-nasal drip, reflux, smoking, obesity, medication, or swallowing problems are contributing, those need to be addressed. Chronic cough usually improves best when the main driver has been identified correctly.

Cough hypersensitivity and laryngeal sensitivity treatment

If the main problem is cough hypersensitivity, treatment is aimed at calming the irritated upper airway and breaking the cough cycle. This may include hydration, reducing throat clearing, trigger management, reflux control where relevant, and cough control therapy with a speech and language therapist or physiotherapist experienced in chronic cough.

Cough control therapy often includes recognising the warning sensation before a cough, suppressing the urge with breathing strategies, sipping water, swallowing instead of coughing, and reducing the dryness and irritation that keep the cycle going.

In some patients, medication is also used for cough hypersensitivity, particularly when the cough is persistent and not settling with simpler measures. This is usually reserved for selected cases and depends on the overall clinical picture.

Treatment when swallowing or vocal cord function is part of the problem

If coughing is related to aspiration or swallowing difficulty, treatment may involve speech and language therapy, swallowing strategies, diet modification where needed, and treatment of the underlying cause. If vocal cord palsy is contributing, management may also include voice and swallow therapy and, in selected patients, procedures to improve vocal cord closure and airway protection.

Specialist treatment for persistent cough

In selected patients whose cough does not settle despite addressing the main contributing factors, more specialist treatment may be considered.

How I approach this in clinic

When I assess a patient with chronic cough, my aim is not simply to decide whether the throat looks irritated. The key question is what is actually driving the cough.

In some patients the main issue is nasal inflammation, post-nasal drip, or reflux. In others, the bigger factor is laryngeal sensitivity and a self-perpetuating cough cycle. In some, coughing with eating and drinking points towards aspiration or another swallowing problem, and vocal cord palsy can occasionally be part of that picture. But it is equally important to make sure a chest cause is not being missed. That is why a respiratory review is often a key part of the overall assessment, even when the cough feels as though it is coming from the throat.

Useful links

Disclaimer

This page is intended as general information only. It does not replace a consultation, examination, or individual medical advice.