Essential HPI Components for a Patient with Cough
When evaluating a patient with cough, the HPI must first establish the duration of cough to classify it as acute (<3 weeks), subacute (3-8 weeks), or chronic (>8 weeks), as this fundamentally narrows the differential diagnosis and guides subsequent evaluation 1, 2.
Critical Historical Elements to Document
Duration and Temporal Characteristics
- Exact duration in weeks - this is the single most important piece of information 1, 2
- Onset timing (sudden vs. gradual)
- Pattern (constant vs. intermittent, time of day variations)
- Relationship to recent upper respiratory infection (particularly for subacute cough) 1
Medication History
- Current ACE inhibitor use - document when started, as cough can occur anytime within the first year of use 1
Smoking History
- Current smoking status - cigarette smoking commonly causes productive cough meeting chronic bronchitis criteria 1
- Pack-years calculation 4
- Cessation attempts and timing
- Most smokers experience cough resolution within 4 weeks of cessation, though some take longer 1
Associated Respiratory Symptoms
- Sputum production - quantity, color, consistency, timing
- Note: Sputum characteristics have limited diagnostic value for determining etiology 5
- Dyspnea or shortness of breath 6
- Wheezing (reported by patient) 4
- Chest pain, particularly pleuritic pain 6
Upper Airway Symptoms
- Nasal congestion, rhinorrhea, postnasal drip sensation 1, 5
- Sore throat 6
- Sinus pressure or facial pain
- Voice changes or hoarseness 7
Gastrointestinal Symptoms
- Heartburn, regurgitation, dyspepsia 1, 5
- Document even if absent - "silent GERD" can present with cough alone 5
Systemic Symptoms (Red Flags)
- Fever, night sweats, unintentional weight loss - suggest serious underlying disease 1
- Hemoptysis
- Progressive dyspnea
Exposure History
- Geographic location - endemic areas for tuberculosis or fungal diseases 1, 5
- Occupational exposures - workplace sensitizers, dust, chemicals, hot acidic conditions 3, 8
- Environmental exposures - birds, farming, aerosolized water, allergens 9
- Hobbies and pets 3
Past Medical History
- Previous diagnosis of asthma, COPD, or chronic bronchitis 1, 10
- History of tuberculosis, cancer, or AIDS 1, 5
- Atopic disease 3
- Gastroesophageal reflux disease 1
Allergen-Induced Symptoms
- Symptoms triggered by specific allergens 4
- Seasonal variation
Important Clinical Caveats
The character, timing, and presence/absence of sputum production have no diagnostic value in determining the cause of chronic cough 5. Even patients with significant sputum production who are nonsmokers, not on ACE inhibitors, and have normal chest radiographs typically have upper airway cough syndrome (UACS), asthma, GERD, or combinations thereof 5.
For chronic cough in nonsmokers not taking ACE inhibitors with normal chest radiographs, 92-100% of cases are explained by the triad of UACS, asthma, and GERD - often presenting as "silent" forms without typical associated symptoms 5.
In endemic areas, tuberculosis must be considered, though UACS, asthma, nonasthmatic eosinophilic bronchitis, and GERD remain the most common causes even in these regions 5.