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The causes of upper airway obstructions can be acute or chronic. Acute causes of upper airway obstruction include foreign body aspiration, blunt trauma to the neck, infection, and swelling due to allergies or other inflammatory conditions. [3]
Shennong Bencaojing (also Classic of the Materia Medica or Shen-nong's Herbal Classics [1] and Shen-nung Pen-tsao Ching; Chinese: 神農本草經) is a Chinese book on agriculture and medicinal plants, traditionally attributed to Shennong.