Aspiration pneumonia causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sunny Kumar MD [2], Sadaf Sharfaei M.D.[3]


Aspiration pneumonia is caused by aspiration of different particles including secretions, gastric contents or any foreign material which reaches lung parenchyma and damages lung tissue by inflammation. Microorganisms that are responsible for aspiration pneumonia include S. aureus, S. pneumoniae, Enteric bacilli, Hemophilus species, Neisseria species, M. catarrhalis, P. aeruginosa.


Common Causes

Aspiration pneumonia may be caused by:[1]

Less Common Causes

Less common causes of aspiration pneumonia include:

Causes by Organ System

Cardiovascular No underlying causes
Chemical/Poisoning No underlying causes
Dental No underlying causes
Dermatologic No underlying causes
Drug Side Effect No underlying causes
Ear Nose Throat No underlying causes
Endocrine No underlying causes
Environmental No underlying causes
Gastroenterologic No underlying causes
Genetic No underlying causes
Hematologic No underlying causes
Iatrogenic No underlying causes
Infectious Disease S. aureus, S. pneumoniae, Enteric bacilli, Hemophilus species, Neisseria species, M. catarrhalis, P. aeruginosa 
Musculoskeletal/Orthopedic No underlying causes
Neurologic No underlying causes
Nutritional/Metabolic No underlying causes
Obstetric/Gynecologic No underlying causes
Oncologic No underlying causes
Ophthalmologic No underlying causes
Overdose/Toxicity No underlying causes
Psychiatric No underlying causes
Pulmonary No underlying causes
Renal/Electrolyte No underlying causes
Rheumatology/Immunology/Allergy No underlying causes
Sexual No underlying causes
Trauma No underlying causes
Urologic No underlying causes
Miscellaneous Aspiration of different particles including secretions, gastric contents or foreign body

Causes in Alphabetical Order

List the causes of aspiration pneumonia in alphabetical order.


  1. DiBardino, David M.; Wunderink, Richard G. (2015). "Aspiration pneumonia: A review of modern trends". Journal of Critical Care. 30 (1): 40–48. doi:10.1016/j.jcrc.2014.07.011. ISSN 0883-9441.
  2. Lanspa, Michael J.; Jones, Barbara E.; Brown, Samuel M.; Dean, Nathan C. (2013). "Mortality, morbidity, and disease severity of patients with aspiration pneumonia". Journal of Hospital Medicine. 8 (2): 83–90. doi:10.1002/jhm.1996. ISSN 1553-5592.