• Wheezing

Acute

• Foreign-body aspiration
• Laryngospasm
• Angioedema
• Laryngeal edema from airway burns
• Trauma to larynx or pharynx
• Epiglottitis
• Pharyngeal or retropharyngeal abscess
• Ludwig's angina
• Acute allergic laryngitis
• Vocal cord dysfunction

Chronic

• Carcinoma of larynx or pharynx
• Laryngeal or subglottic stenosis
• Laryngeal granulomas or webs
• Bilateral vocal cord paralysis
• Vocal cord dysfunction