Occupational dust exposure — factory work — independent risk factor
Chronic productive morning cough — years before diagnosis
Progressive dyspnea on exertion — stairs getting harder
Barrel chest — lung hyperinflation
Hyperresonance on percussion — sounds like a drum
Prolonged expiration — breathing out takes twice as long
Pursed lip breathing — auto-PEEP compensation
FEV1/FVC below 70% on spirometry — obstructive pattern
Air trapping — alveolar destruction — emphysema component
Winter exacerbations with green sputum — infectious trigger
Home oxygen — chronic hypoxemia
Why It's NOT the Similar Diseases
NOT asthma — asthma typically starts young — has allergic triggers — no barrel chest. Jimmy’s disease started after decades of smoking — progressive and destructive. NOTE: Per GOLD 2026 — bronchodilator reversibility alone has poor discriminative value between COPD and asthma — overlap exists — clinical history and risk factors are essential alongside spirometry.
NOT congestive heart failure — CHF causes dyspnea with fluid overload — bilateral crackles — elevated JVD — pitting edema — not barrel chest or hyperresonance. CHF is WET — COPD is AIR TRAPPING.
NOT pulmonary fibrosis — fibrosis causes RESTRICTIVE disease — small stiff lungs — low FVC — normal FEV1/FVC ratio. COPD is OBSTRUCTIVE — fibrosis is RESTRICTIVE.
NOT lung cancer — can coexist with COPD but presents with hemoptysis — weight loss — focal findings on imaging.
NOT bronchiectasis — causes chronic cough with large amounts of purulent sputum — dilated airways on CT.
Differential Diagnosis List
Asthma — ruled out by clinical history — smoking — occupational exposure — though spirometry overlap exists
CHF — ruled out by hyperresonance and barrel chest — no fluid signs
Pulmonary fibrosis — ruled out by obstructive not restrictive spirometry
Lung cancer — ruled out by imaging — though can coexist
Alpha-1 antitrypsin deficiency — consider in young patients or non-smokers with emphysema