Cough Diagnosis and Management

Essential Initial Questions

• The American Thoracic Society recommends establishing the exact duration of cough in weeks to determine whether it's acute, subacute, or chronic, as this fundamentally determines the diagnostic approach and most likely etiologies 1, 2
• The European Respiratory Society suggests asking about the onset of cough, whether it's sudden or gradual, and whether symptoms are worsening, stable, or improving 3
• The American College of Chest Physicians recommends determining the timing patterns of cough, such as nocturnal, morning, or constant, to help identify potential causes like asthma or GERD 1
• The British Thoracic Society advises asking about the paroxysmal nature of the cough to help differentiate between potential causes 1

Red Flag Symptoms

• The American College of Chest Physicians recommends immediately investigating for malignancy or tuberculosis in patients with hemoptysis 1, 2, 3
• The European Respiratory Society suggests that unintentional weight loss may indicate malignancy or tuberculosis 3
• The American Thoracic Society recommends immediate evaluation for patients with fever or prominent systemic illness 2
• The British Thoracic Society advises suspicion of inhaled foreign body, particularly with sudden onset 2

Sputum Production

• The European Respiratory Society recommends quantifying daily sputum production, as significant sputum usually indicates primary lung pathology 2, 3
• The American College of Chest Physicians suggests asking if productive cough occurs most days for ≥3 months over ≥2 consecutive years to define chronic bronchitis 3

Medication History

• The British Thoracic Society recommends asking specifically about ACE inhibitor use, as it's a common and easily reversible cause of cough 4
• The American College of Chest Physicians suggests that ACE inhibitor-associated cough can occur within hours to over a year after starting treatment and typically resolves within 26 days after discontinuation 4

Occupational and Environmental Exposures

• The European Respiratory Society recommends obtaining a thorough occupational history, including current and past jobs, specific tasks, and duration of exposure 2, 3, 4
• The American Thoracic Society suggests asking about exposure to dust, chemicals, fumes, hot acidic conditions, or respiratory irritants 3, 4

Smoking History

• The American College of Chest Physicians recommends quantifying tobacco use, as smoking is responsible for 85-90% of chronic bronchitis cases and is dose-related 3
• The European Respiratory Society suggests documenting current smoking status, pack-years, and years since quitting if former smoker 3

Associated Symptoms by System

• The American Thoracic Society recommends asking about upper airway symptoms, such as postnasal drip sensation or frequent throat clearing, to help identify potential causes like upper airway cough syndrome 3
• The British Thoracic Society suggests asking about lower airway symptoms, such as wheezing or chest tightness, to help identify potential causes like asthma or eosinophilic bronchitis 3
• The American College of Chest Physicians recommends asking about gastrointestinal symptoms, such as heartburn or acid regurgitation, to help identify potential causes like GERD 3

Past Medical History

• The European Respiratory Society recommends asking about history of asthma, COPD, or bronchiectasis, as these commonly present with or are exacerbated by cough 2, 4
• The American Thoracic Society suggests asking about previous pneumonia, tuberculosis, or pertussis infection 4

Impact Assessment

• The American College of Chest Physicians recommends using validated cough severity assessment tools, such as cough-specific quality of life questionnaires or visual analogue scales, to assess the impact of cough on quality of life 1, 2, 3
• The European Respiratory Society suggests assessing the impact of cough on sleep quality and frequency of nocturnal awakening 3
• The British Thoracic Society advises determining the effect of cough on work productivity and social activities 3

Evidence‑Based Elements of a Respiratory History

Symptom Timing and Pattern

• Nocturnal cough suggests asthma, heart failure, or infection, whereas cough that improves overnight points toward gastro‑oesophageal reflux disease. 5
• The presence of acute cough with worsening breathlessness warrants assessment for asthma or anaphylaxis. 6

Red‑Flag Presentations Requiring Urgent Evaluation

• Hemoptysis should prompt immediate investigation for malignancy or tuberculosis. 6
• Fever or prominent systemic illness in a patient with cough indicates a serious acute lung infection and needs prompt work‑up. 6
• Sudden onset of cough with suspicion of an inhaled foreign body mandates urgent bronchoscopy referral. 6
• New‑onset voice change may be a sign of vocal‑cord palsy and requires rapid assessment. 6

Smoking‑Related Cough

• Current smoking is one of the most common causes of persistent cough. 5

Occupational and Environmental Exposure

• A detailed occupational history—including specific tasks, duration of exposure, and latency (≥15 years for asbestos‑related disease)—is essential when respiratory disease is suspected. 7
• High‑risk occupations for asbestos‑related disease include asbestos product manufacturing, mining, construction trades (e.g., insulators, sheet‑metal workers, electricians, plumbers, pipefitters, carpenters), power‑plant work, boilermaking, and shipyard work. 7
• Occupational titles alone (e.g., “millwright,” “fireman,” “mixer”) are insufficient; precise task descriptions are required to assess exposure. 7
• “Bystander” exposure can occur in workers who are not directly handling hazardous materials but work in proximity to them. 7
• In patients with diffuse pleural thickening or fibrothorax, dyspnoea on exertion occurs in ~95 % and chest pain in >50 % of cases. 7
• Rapidly progressive or severe chest pain should raise suspicion for malignancy or non‑malignant pleuritis. 7

Associated Respiratory Symptoms

• Insidious dyspnoea on exertion is the most common symptom associated with asbestosis. 7
• Absence of dyspepsia does not exclude gastro‑oesophageal reflux disease as a cause of cough. 5

COPD Diagnostic Criteria (GOLD)

• Diagnosis of chronic obstructive pulmonary disease requires:

Impact on Quality of Life

• Both acute and chronic cough significantly impair quality of life, with psychological domains especially affected in chronic cough. 5

Clinical Pitfalls and Recommendations

• Do not rely solely on occupational titles; detailed exposure assessment is mandatory. 7
• Do not assume that lack of dyspepsia excludes reflux as a cough aetiology. 5
• Patients may forget brief periods of employment with intense exposure; clinicians should probe for early‑career or short‑term jobs. 7
• Subjective symptoms need objective corroboration but still provide valuable information about future risk. 7
• The character and timing of cough have limited diagnostic specificity, although certain patterns can suggest specific aetiologies. 5