When to See a Pulmonologist for Chronic Cough

What Counts as Chronic Cough?

In medical terms, we classify coughs by duration. An acute cough lasts less than 3 weeks and is usually caused by a cold or upper respiratory infection. A subacute cough lasts 3-8 weeks, often lingering after an infection. A chronic cough persists beyond 8 weeks and is the type that typically benefits from specialist evaluation.

The Most Common Causes

In non-smokers with a normal chest X-ray, chronic cough is most commonly caused by one or more of these three conditions — sometimes called the "pathogenic triad":

Upper airway cough syndrome (post-nasal drip): Mucus from the sinuses dripping down the back of the throat triggers the cough reflex. Patients may notice throat clearing, a sensation of something in the throat, or nasal congestion.

Asthma and cough-variant asthma: Not all asthma presents with wheezing. Cough-variant asthma causes a dry, persistent cough — often worse at night or with exercise — without the classic wheeze. Pulmonary function testing with bronchoprovocation challenge is key to diagnosis.

Gastroesophageal reflux disease (GERD): Acid reflux can trigger coughing even without typical heartburn symptoms. This "silent reflux" is one of the most commonly overlooked causes of chronic cough.

Less Common but Important Causes

When the usual suspects don't explain the cough, we investigate further:

• check_circleMedication side effects — ACE inhibitors (blood pressure medications like lisinopril) cause a dry cough in up to 15% of patients.
• check_circleNon-asthmatic eosinophilic bronchitis — Airway inflammation without the bronchospasm seen in asthma.
• check_circleChronic infections — Including pertussis (whooping cough), which can affect adults.
• check_circleInterstitial lung disease — Early-stage pulmonary fibrosis can present primarily as cough.
• check_circleLung masses — Rarely, a persistent cough can be the first sign of a lung tumor.

Our Diagnostic Approach

At Pulmonary & Sleep Experts, we use a systematic, evidence-based approach to chronic cough evaluation:

1. 1Detailed history — When the cough started, what makes it better or worse, associated symptoms, medications, and environmental exposures.
2. 2Pulmonary function testing — Spirometry and sometimes methacholine challenge to assess for asthma.
3. 3Imaging — Chest X-ray and, when indicated, CT scan.
4. 4Empiric therapy trials — Targeted treatment trials for the most likely cause, which serves both diagnostic and therapeutic purposes.
5. 5Additional testing — Sputum analysis, pH monitoring, or bronchoscopy when initial evaluation is inconclusive.

When to See a Specialist

You should see a pulmonologist for your cough if:

• check_circleIt has lasted more than 8 weeks
• check_circleYour primary care doctor's treatments haven't resolved it
• check_circleYou're coughing up blood
• check_circleYou have unexplained weight loss alongside the cough
• check_circleYou're a current or former smoker with a changing cough pattern
• check_circleThe cough is significantly affecting your sleep, work, or quality of life

The Bottom Line

Chronic cough is almost always treatable once the underlying cause is identified. The key is a systematic evaluation — and patience, since it sometimes takes a trial of multiple treatments to find the right answer. If you've been dealing with a persistent cough, we're here to help you get to the bottom of it.