Reflux and Chronic Cough: The Connection People Miss

One of the three commonest causes of chronic cough, and the one most often missed because it frequently causes no heartburn at all.

The three big causes of chronic cough

A cough lasting more than eight weeks is chronic by definition, and in the large majority of non-smokers with a normal chest X-ray it comes down to one of three things, or a combination.

Upper airway cough syndrome, which used to be called postnasal drip. Asthma, including the cough-variant form where cough is the only symptom. And gastro-oesophageal reflux.

Reflux is the one most often overlooked, and the reason is a specific and counterintuitive fact about how it presents.

It frequently causes no heartburn

This is the crucial point. A substantial proportion of people with reflux-related cough report no heartburn, no acid taste and no indigestion at all.

The term for this is silent or laryngopharyngeal reflux. The refluxate reaches the upper oesophagus, larynx and airway without producing the burning sensation associated with classic reflux, partly because the tissue there responds differently and partly because even small quantities of non-acidic gastric content can be irritant.

So the absence of heartburn does not rule reflux out, and clinicians who rely on that as a screening question will miss it.

The two mechanisms

Microaspiration. Small quantities of gastric content reach the larynx and airway, where even minute amounts of acid, pepsin or bile provoke inflammation and cough. Pepsin has been detected in airway samples in reflux-related cough.

The oesophago-bronchial reflex. Acid in the distal oesophagus stimulates vagal afferents that trigger cough reflexively, without anything reaching the airway at all. This is why cough can occur with reflux that never travels far up the oesophagus.

The vicious cycle

Worth understanding because it explains why the problem becomes self-sustaining.

Coughing sharply increases intra-abdominal and intrathoracic pressure, which promotes further reflux. That reflux triggers more cough. The loop tightens over time.

Breaking it usually requires addressing both sides — reducing reflux and calming the cough reflex — rather than either alone.

The signature to look for

• Dry or minimally productive cough rather than a wet chest cough.
• Worse on waking, or worse when lying down.
• Worse after meals, particularly large or late ones.
• Hoarseness, especially in the morning.
• Chronic throat clearing.
• A sensation of a lump in the throat.
• Bitter or sour taste on waking.
• Worse with alcohol, coffee, chocolate, citrus, tomato or fatty food.
• Worse when bending forward or lifting.

The cheap diagnostic trial

1. Raise the head of the bed by fifteen to twenty centimetres, using blocks under the legs or a wedge under the mattress. Extra pillows do not work — they bend the abdomen and can make reflux worse.
2. Stop eating three hours before bed. This single change is often the most effective.
3. Reduce the obvious triggers for two weeks — alcohol, coffee, chocolate, very fatty meals, large portions late in the day.
4. Sleep on your left side. Stomach anatomy makes left-side sleeping less reflux-prone.
5. Give it two to three weeks and note whether the cough changes.
6. If it improves substantially, you have your answer and a clear direction for further discussion with your doctor.

When to get it assessed properly

Any chronic cough over eight weeks deserves medical assessment rather than indefinite self-management. Difficulty swallowing, painful swallowing, unintentional weight loss, vomiting blood or black stools require prompt evaluation.

Long-standing untreated reflux carries its own risks to the oesophagus, so this is not a symptom to simply live with once identified.