Upper respiratory tract (pharynx and larynx) and lower respiratory tract (trachea, bronchi, and lung) Risk factors for<unk>  include conditions which depress the level of consciousness (such as traumatic brain injury, alcohol intoxication, drug overdose, and general anesthesia). A decreased gag reflex, upper esophageal sphincter and lower esophageal sphincter tone, gastroesophageal reflux, full stomach, as well as obesity, stroke, and pregnancy can all increase the risk of<unk>  in the semiconscious. Tracheal intubation or presence of a gastric tube (for example, a feeding tube) may also increase the risk.
Pulmonary aspiration
Aspiration pneumonia
Air embolism
Parapneumonic effusion
Viral pneumonia
Bronchopleural fistula
Pulmonary consolidation
Tracheal deviation