How should I treat an adult with chronic dry cough and no fever?

Treatment of Chronic Dry Cough Without Fever in Adults

For chronic dry cough without fever, you must systematically address the three most common causes—upper airway cough syndrome (UACS), asthma/eosinophilic bronchitis, and gastroesophageal reflux disease (GERD)—using sequential therapeutic trials, as these account for over 90% of cases and frequently coexist. 1, 2, 3

Immediate Actions

Stop ACE inhibitors immediately if the patient is taking them—no patient with troublesome cough should continue these medications, as they are a common reversible cause. 1, 2

Counsel and support smoking cessation if applicable, as this produces marked symptom remission and is the most significant modifiable risk factor. 1, 2

Obtain mandatory baseline investigations: chest radiograph and spirometry to exclude structural lung disease, malignancy, and assess airway function. 1, 2, 4

Sequential Treatment Algorithm

Step 1: Treat Upper Airway Cough Syndrome (UACS) First

Start intranasal corticosteroids (fluticasone 100-200 mcg daily or mometasone) as first-line therapy for at least 1 month, even if the patient lacks obvious postnasal drip symptoms—approximately 20% of UACS cases are "silent" without typical nasal discharge. 1, 5, 2

• Look for cobblestoning of the posterior pharyngeal wall, constant throat clearing, and seasonal patterns on examination. 5
• Poor correlation exists between symptom severity and cough presence, so absence of prominent upper airway symptoms does not exclude UACS. 5
• If cardiovascular contraindications exist for decongestants (hypertension, tachycardia), intranasal corticosteroids are safer. 2

Step 2: Evaluate and Treat Eosinophilic Airway Disease

Perform a 2-week trial of oral corticosteroids (prednisone 30-40 mg daily) to identify corticosteroid-responsive cough, because no reliable bedside test excludes eosinophilic inflammation and cough may be the only manifestation of asthma or eosinophilic bronchitis. 1, 2

• If cough improves with oral steroids, transition to inhaled corticosteroid maintenance (fluticasone 220 µg twice daily or budesonide 360 µg twice daily) for up to 8 weeks to achieve full therapeutic response. 1
• Consider bronchial provocation testing if spirometry is normal but clinical suspicion remains high. 2

Step 3: Treat Gastroesophageal Reflux Disease (GERD)

Initiate high-dose proton-pump inhibitor therapy (omeprazole 40 mg twice daily or equivalent) combined with alginates for a minimum of 3 months, even when typical reflux symptoms are absent—"silent GERD" can present solely as chronic cough. 1, 5, 2

• Reflux-associated cough may occur without any gastrointestinal symptoms, and improvement may take the full 3 months. 5, 2
• Include dietary modifications: low-fat diet, avoid coffee, tea, chocolate, citrus, and alcohol. 5
• Never undertreat GERD—a full 3-month trial of intensive acid suppression is required, not shorter durations. 1, 5, 2

Additive Sequential Therapy

Address the most probable causes sequentially AND additively, as multiple causes frequently coexist in up to 25% of patients—do not stop after the first intervention. 1, 3, 6

Formally quantify treatment effects using validated cough-specific quality of life questionnaires or visual analog scales to objectively assess response. 1, 2

What NOT to Do

Avoid routine prescription of antibiotics, bronchodilators, or mucolytics for cough relief in stable chronic cough—these are not supported by evidence and should not be used unless bacterial infection is documented. 1

Do not use cough suppressants like dextromethorphan as primary therapy for chronic cough—while mentioned for acute viral coughs, treatment of the underlying cause is the effective strategy for chronic cough. 7

Red-Flag Symptoms Requiring Urgent Evaluation

Refer immediately if the patient has:

• Hemoptysis 1
• Significant dyspnea or hypoxemia 1
• Prolonged fever or constitutional symptoms 7, 1
• Recent hospitalization 7
• Underlying chronic conditions (COPD, heart disease, diabetes, asthma) 7

Referral to Specialist Cough Clinic

If cough persists beyond 8 weeks despite comprehensive empiric therapy for all three common causes with adequate treatment duration (1 month for UACS, 2 weeks for steroid trial, 3 months for GERD), refer to a specialist cough clinic—specialist-led management yields significantly higher success rates than general respiratory clinics. 7, 1, 5, 2

Consider chronic cough idiopathic only after thorough assessment at a specialist cough clinic—premature diagnosis of idiopathic cough before adequate treatment trials is a critical pitfall. 1, 5, 2

Common Pitfalls to Avoid

• Never continue ACE inhibitors in patients with troublesome cough. 1, 2
• Never undertreat GERD—requires full 3-month trial, not 4-6 weeks. 1, 5, 2
• Never stop after treating only one cause—use additive sequential therapy as multiple causes frequently coexist. 1
• Never diagnose idiopathic cough prematurely—ensure adequate treatment duration (1 month for intranasal steroids, 3 months for GERD therapy) and specialist evaluation first. 1, 5, 2
• Recognize that cough suppression may be contraindicated when cough clearance is important for secretion management. 1, 5, 2