What is the workup for chronic cough in general practice?
Chronic cough, defined as lasting more than eight weeks in adults, accounts for roughly 10 percent of respiratory referrals and represents one of the most frequent presenting complaints in general practice. The most common causes in adults are upper airway cough syndrome, asthma, nonasthmatic eosinophilic bronchitis, and gastroesophageal reflux disease, alone or in combination. A structured workup lets general practitioners identify the cause in most patients without immediate specialist referral.
Step-by-Step Workup
1. Take a focused history
The history drives the entire diagnostic process. Document cough duration, character, timing, and sputum production. Ask specifically about:
- Medication use: ACE inhibitors cause cough in up to 20 percent of patients. Also review DPP-4 inhibitors like sitagliptin.
- Smoking status: Current or former smokers need chest imaging earlier in the workup.
- Environmental and occupational exposures: Irritants at work or home may be the sole trigger.
- Associated symptoms: Heartburn, nasal congestion, postnasal drip, wheeze, dyspnea, hoarseness.
- Red flags: Hemoptysis, unexplained weight loss, fever, recurrent pneumonia, hoarseness, excessive dyspnea, or a smoking history of 20 pack-years.
2. Perform a targeted physical examination
Examine the chest, heart, ears, pharynx, and nose. Look for signs of asthma such as wheeze, upper airway inflammation, nasal polyps, or postnasal drip. In most patients with a normal examination and no red flags, serious pathology is unlikely.
3. Order baseline investigations
For patients without an obvious cause on history and examination alone:
- Chest radiography: Rules out most infectious, inflammatory, and malignant thoracic conditions. Not required in pregnant women and optional in younger nonsmokers with suspected postnasal drip.
- Spirometry with reversibility testing: Detects obstructive patterns consistent with asthma or COPD. If spirometry is unavailable, home peak flow monitoring with variability greater than 20 percent supports an asthma diagnosis.
When clinical examination, chest X-ray, and spirometry are all normal, the frequency of serious pathology is low.
4. Stop suspected offending medications
If the patient takes an ACE inhibitor, switch to an alternative class and reassess after three months. ACE inhibitor cough may persist for weeks after discontinuation.
5. Trial treatment for upper airway cough syndrome
When postnasal drip, recurrent throat clearing, or nasal congestion is present, start a first-generation antihistamine with a decongestant. Add topical nasal steroids if allergic rhinitis is suspected. Symptoms should improve within one to two weeks, though full resolution may take several weeks.
6. Trial treatment for asthma
If asthma or cough-variant asthma is suspected based on history or spirometry, begin an inhaled corticosteroid. Add a short-acting bronchodilator as needed. If spirometry is normal but suspicion remains high, consider methacholine challenge testing. Cough resolution after asthma treatment confirms the diagnosis. A leukotriene receptor antagonist such as montelukast can be added.
7. Trial treatment for gastroesophageal reflux disease
When reflux symptoms accompany the cough, initiate a proton pump inhibitor trial for a minimum of eight weeks. Alginates may provide additional benefit. A definitive GERD-related cough diagnosis requires that the cough nearly or completely resolves with treatment. If empiric therapy fails, 24-hour esophageal pH monitoring is the most sensitive test.
8. Consider nonasthmatic eosinophilic bronchitis
If the above trials are negative, this diagnosis requires sputum eosinophil analysis or exhaled nitric oxide measurement. It responds well to inhaled corticosteroids.
9. Reassess and refer if needed
Each treatment trial should last a minimum of two months with a two-week washout between trials. If all common causes have been addressed and the cough persists, refer to a pulmonologist for further investigation including bronchoscopy, high-resolution CT, or nasendoscopy.
Red Flags Requiring Urgent Investigation
Contact your respiratory team or refer urgently if you identify:
- Hemoptysis of any volume in a patient over 40 or with a smoking history
- Unexplained weight loss with persistent cough
- Recurrent pneumonia in the same lung segment
- Hoarseness lasting more than three weeks
- Severe dyspnea disproportionate to the cough
- Smoking history of 20 pack-years or current smoker older than 45
- Abnormal chest X-ray findings suggesting mass, effusion, or interstitial disease
Common Questions
When should I order a CT scan instead of starting with a chest X-ray? Reserve CT for abnormal chest X-ray findings, persistent red flags, or when the cough remains unexplained after completing empiric treatment trials. Routine CT in patients with normal examination and chest X-ray is not cost-effective.
How long should each treatment trial last? Each trial should run for a minimum of two months. Assess response at 4 to 8 weeks. If no improvement, discontinue and move to the next most likely cause. Allow a two-week washout between trials.
What about children with chronic cough? In children, a cough lasting more than four weeks is considered chronic. The most common causes are respiratory infections, asthma, protracted bacterial bronchitis, and GERD. Evaluation should include chest radiography and spirometry. Protracted bacterial bronchitis is a frequent cause unique to pediatric patients.
When is cough due to nonasthmatic eosinophilic bronchitis? Consider this diagnosis when asthma testing is negative but the cough persists. It requires sputum eosinophil count or exhaled nitric oxide measurement for diagnosis and responds to inhaled corticosteroids.
Protocol Summary
- Take a thorough history: medications, smoking, exposures, associated symptoms, red flags
- Perform targeted physical exam: chest, heart, ears, pharynx, nose
- Order chest radiography and spirometry as baseline
- Discontinue ACE inhibitors if applicable and reassess at 3 months
- Trial treatment for upper airway cough syndrome with antihistamine and decongestant
- Trial inhaled corticosteroid for suspected asthma or cough-variant asthma
- Trial proton pump inhibitor for reflux-associated cough for 8 weeks minimum
- Consider eosinophilic bronchitis if above trials fail
- Refer to pulmonology if cough persists after all empiric trials
How Rovetia Helps
Chronic cough workups span multiple visits, treatment trials, and test results over weeks or months. Rovetia compiles the full patient timeline from notes, lab PDFs, imaging reports, and voice memos into a single searchable record. When a patient returns for follow-up, you can instantly review what trials were attempted, how long each lasted, and what the response was, without digging through scattered records. AI-assisted structured data extraction keeps the clinical picture organized across visits, so nothing falls through the cracks during sequential treatment trials.
Sources
- Chronic Cough: Evaluation and Management | AFP
- Cough: How should I assess a person with cough? | NICE CKS
- Evaluation of the Patient with Chronic Cough | AFP