A persistent cough is always worth paying attention to. If there’s no clear cause, you’re usually advised to see a doctor after 3–4 weeks. Most people assume it’s an infection, allergies, or another lung issue. And often, that’s true. A post-viral cough can linger for 6 weeks or more.

But there’s another cause that often gets missed: reflux. Acid reflux can irritate the throat and trigger a chronic cough. In cases of silent reflux, it may be the only reflux symptom.

Not all reflux presents as heartburn. If you’ve got a persistent cough, it’s worth considering it as a possible cause. But what should you look for, and what can you do about it?

Can Acid Reflux Cause a Chronic Cough?

The short answer: yes.

GERD is a recognised cause of chronic cough but because coughing is typically thought of as a respiratory issue, reflux is often overlooked as the cause. But it’s quite common. Around 40% of patients with gastroesophageal reflux disease (GERD) experience a chronic cough.

How Reflux Triggers a Cough

Direct Irritation of the Airways

Acid reflux occurs when acid in the stomach backflows into the oesophagus. Sometimes it doesn’t stop there. If the acid continues into the larynx (throat), it can irritate the airway lining, triggering the cough reflex.

Laryngopharyngeal reflux (LPR) often presents “silently,” which means there’s no heartburn. A cough might be the only symptom.

Nerve Reflex Mechanism

The other reason for a chronic cough is stimulation of the vagus nerve, which runs close to the oesophagus. Even if acid never reaches the throat, it can cause this kind of cough response.

Reflux Cough Symptoms to Look Out For

You can’t assume every cough is a reflux cough. But there are a few tell-tale signs to look for.

Common features include:

• Persistent: Lasts 8 weeks or more and doesn’t respond to typical cold or allergy treatments

  Dry: Usually doesn’t produce mucus or phlegm

• Worse at night: Lying down makes it easier for acid to move upward, triggering coughing

• After meals: Often flares after eating, especially following large or spicy meals

Why Reflux Cough Is Often Misdiagnosed

Reflux cough overlaps with several other conditions, like asthma, postnasal drip, chest infections, and post-viral coughs. Without the classic heartburn symptoms, doctors are likely to reach for these explanations first. It makes sense. Respiratory symptoms often have respiratory causes.

However, this delays a proper diagnosis as doctors work through these conditions before considering reflux as the cause.

How to Tell If Your Cough Is Caused by GERD

Pattern Recognition

The big difference between a reflux cough and a respiratory-related cough is when it occurs. Respiratory conditions are often triggered by factors such as cold air, dust, or dehydration.

In contrast, a reflux cough will consistently occur after meals or lying down. There’ll be a lack of response to standard cough treatments. It might even disappear if you eat smaller meals or avoid trigger foods, only to reappear later when the habits return.

Diagnostic Testing

There’s one way to tell for sure and that’s through testing.

24-hour pH testing involves inserting a small tube through your nose and down your oesophagus, which is attached to a monitor you wear. This monitor then records acid exposure. If high levels of acid are recorded, then a reflux-related cough can be considered.

Endoscopy is another diagnostic procedure to help determine acid reflux. It can detect if there are any issues with the lower oesophageal sphincter and if there are any signs of acid-related damage to your oesophagus.

Lastly, your doctor may recommend taking an antacid when you start coughing; if this reduces symptoms, it can aid the diagnosis. The same is true of long-term acid relief like H2 blockers or proton pump inhibitors (PPIs).

Treatment Options for Reflux-Related Cough

Lifestyle and Dietary Changes

If you suspect you’ve got a reflux-related cough, changing your lifestyle can relieve symptoms. Try these tips:

·Avoid trigger foods. Avoid lots of fatty foods, spicy foods, alcohol, or caffeine. These foods can increase acid production or weaken the lower oesophageal sphincter, increasing the risk of reflux.

·Weight management. Maintaining a healthy weight can reduce pressure on the sphincter, preventing acid reflux.

·Meal timing. Eating large meals late at night increases the risk of acid reflux during sleep. Try to time your meals earlier and eat smaller portions.

Medical Treatment

If acid reflux persists, your doctor may consider medical treatment. Antacids are the first-line treatment. They neutralise acid during an attack, providing immediate relief. Long-term acid suppression can also be prescribed, such as H2 blockers or PPIs.

Get Tested for a Reflux Cough

If your cough keeps coming back and doesn’t respond to typical treatments, it’s worth looking beyond the lungs.

The Functional Gut Clinic offers targeted testing for GERD and reflux, including 24-hour pH monitoring to assess acid exposure in the oesophagus. This can help identify of your cough is linked to reflux. It can therefore confirm whether reflux is driving your symptoms and guide a more targeted treatment plan.

Instead of guessing, you get clear answers and a path to actually resolving the cough.

You might find the next article interesting to read: Spicy Food and Heartburn: Is It Really the Culprit?