Pneumonia is an infection deep in the small airways and air sacs of the lungs. The infection will make the air sacs swell and fill with fluid or pus. This causes intense coughing. It will also be hard to breathe.
Types of pneumonia include:
This article will focus on community-acquired pneumonia.
Pneumonia is caused by a germ in the air that you breathe. Germs that most often cause community-acquired pneumonia include:
Pneumonia is more common in older adults. Other factors that may increase the chances of pneumonia:
Health conditions that may increase the risk of community-acquired pneumonia include:
Other environmental factors include:
Pneumonia may cause:
Your doctor will ask about your symptoms and past health. A physical exam will be done. Your doctor may suspect pneumonia based on your symptoms and lung sounds.
Pictures of the lungs can show pneumonia. Pictures may be taken with:
Your doctor may need to know the exact germ that is causing the problem. This step may be needed if there is a severe infection. The germ can be tested through:
Treatment will be based on what may have caused the pneumonia. More support may be needed if there is a severe infection. A hospital stay may be needed if it becomes difficult to breathe.
Medicine can help to fight some infections:
Other medicine may help to manage symptoms:
Severe infections can make it hard for oxygen to get into the body. Oxygen may be given to improve levels in the blood.
Vaccines may help to prevent certain pneumonia:
Steps that may decrease the risk for any respiratory infection include:
American Lung Association
Centers for Disease Control and Prevention
Public Health Agency of Canada
The Lung Association
Blasi F, Aliberti S, Pappalettera M, Tarsia P. 100 years of respiratory medicine: pneumonia. Respir Med. 2007;101(5):875-881.
Community-acquired pneumonia in adults. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T115170/Community-acquired-pneumonia-in-adults. Updated December 18, 2017. Accessed February 16, 2018.
De Roux A, Marcos MA, Garcia E, et al. Viral community-acquired pneumonia in non-immunocompromised adults. Chest. 2004;125(4):1343-1351.
Immunization schedules. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/vaccines/schedules/index.html. Updated February 6, 2018. Accessed February 16, 2018.
Niederman MS. Recent advances in community-acquired pneumonia inpatient and outpatient. Chest. 2007;131(4):1205-1215.
Niederman MS. Review of treatment guidelines for community-acquired pneumonia. Am J Med. 2004;117:Suppl 3A:51S-57S.
Pneumonia. National Heart, Lung, and Blood Institute website. Available at: https://www.nhlbi.nih.gov/health-topics/pneumonia. Updated August 2017. Accessed February 16, 2018.
10/21/2013 DynaMed Plus Systematic Literature Surveillancehttp://www.dynamed.com/topics/dmp~AN~T115170/Community-acquired-pneumonia-in-adults: Hemilä H, Louhiala P. Vitamin C for preventing and treating pneumonia. Cochrane Database Syst Rev. 2013;8:CD005532.
3/10/2014 DynaMed Plus Systematic Literature Surveillancehttp://www.dynamed.com/topics/dmp~AN~T115600/Obstructive-sleep-apnea-OSA-in-adults: Su VY, Liu CJ, Wang HK, et al. Sleep apnea and risk of pneumonia: A nationwide population-based study. CMAJ. 2014;186(6):415-421.
6/17/2014 DynaMed Plus Systematic Literature Surveillancehttp://www.dynamed.com/topics/dmp~AN~T115170/Community-acquired-pneumonia-in-adults: Reissig A, Copetti R, Mathis G, et al. Lung ultrasound in the diagnosis and follow-up of community-acquired pneumonia: A prospective, multicenter diagnostic accuracy study. Chest. 2012;142(4):965-972.
2/3/2015 DynaMed Plus Systematic Literature Surveillancehttp://www.dynamed.com/topics/dmp~AN~T116217/Allergic-rhinitis: Rantala A, Jaakkola JJ, Jaakkola MS. Respiratory infections in adults with atopic disease and IgE antibodies to common aeroallergens. PLoS One. 2013;8(7):e68582.
Last reviewed March 2018 by EBSCO Medical Review Board David L. Horn, MD, FACP Last Updated: 2/3/2015