On respiratory examination

Hyperexpanded chest

• COPD
• Chronic asthma

Postural flapping tremor

• Acute CO2 retention

Stony dull percussion

• Pleural effusion

Fine crepitations

• Pulmonary oedema
• Pulmonary fibrosis

Pleuritic chest pain

• Pulmonary embolism, pneumonia, pneumothorax

Stridor

• Upper airway obstruction, e.g. foreign body, croup