Acute Cough (< 3 weeks) Respiratory Upper Respiratory Symptoms Stridor on inspiration ↑ Work of breathing (indrawing, nasal flare, head bobbing, paradoxical breathing) ↓ SaO₂ ↓ Air entry Conditions Viral URTI Sinusitis Croup Epiglottitis Pertussis Tracheitis Foreign body Anaphylaxis Lower Respiratory Symptoms Wheeze on expiration Asymmetric breath sounds ↑ Work of breathing (indrawing, nasal flare, head bobbing, paradoxical breathing) Crackles Bronchial breath sounds Focal respiratory findings ↓ SaO₂ Conditions Pneumonia Bronchiolitis Asthma Anaphylaxis Foreign body Non-Respiratory Cardiac: Congestive heart failure Neurological: Aspiration Gastrointestinal: Gastroesophageal reflux Other: Habit cough * Indicates Key Condition This is not an exhaustive list of medical conditions.

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