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Risk factors
By Mayo Clinic staffFactors associated with an increased risk of pneumonia include:
- Age. If you're age 65 or older, particularly if you have other conditions that make you more prone to developing pneumonia, you're at increased risk of pneumonia. Very young children, whose immune systems aren't fully developed, also are at increased risk of pneumonia.
- Certain diseases. These include immune deficiency diseases such as HIV/AIDS and chronic illnesses such as heart disease, emphysema and other lung diseases. You're also at increased risk if your immune system has been weakened by chemotherapy or long-term use of immunosuppressant drugs.
- Smoking. Smoking damages your body's natural defenses against the bacteria and viruses that cause pneumonia.
- Having chronic obstructive pulmonary disease (COPD) and using inhaled corticosteroids for more than 24 weeks. Research indicates that this greatly increases your risk of developing possibly serious pneumonia.
- Exposure to certain chemicals or pollutants. Your risk of developing some uncommon types of pneumonia may be increased if you work in agriculture, in construction or around certain industrial chemicals or animals. Exposure to air pollution or toxic fumes can also contribute to lung inflammation, which makes it harder for the lungs to clear themselves.
References
- Pneumonia. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merck.com/mmpe/sec05/ch052/ch052a.html. Accessed April 8, 2011.
- Pneumonia. American Lung Association. http://www.lungusa.org/lung-disease/pneumonia/. Accessed March 17, 2011.
- Durrington H, et al. Recent changes in the management of community-acquired pneumonia in adults. British Medical Journal. 2008;336:1429.
- Menendez R, et al. Treatment failure in community-acquired pneumonia. Chest. 2007;132:1348.
- Singh S, et al. Long-term use of inhaled corticosteroids and the risk of pneumonia in chronic obstructive pulmonary disease: A meta-analysis. Archives of Internal Medicine. 2009;169:219.
- Chong C, et al. Pneumonia in the elderly: A review of the epidemiology, pathogenesis, microbiology and clinical features. Southern Medical Journal. 2008;101:1141.
- Chong C, et al. Pneumonia in the elderly: A review of severity assessment, prognosis, mortality, prevention and treatment. Southern Medical Journal. 2008;101:1134.
- Pneumococcal disease in-short. Centers for Disease Control and Prevention. http://www.cdc.gov/vaccines/vpd-vac/pneumo/in-short-both.htm. Accessed March 23, 2011.
- File TM. Treatment of hospital-acquired, ventilator-associated, and healthcare-associated pneumonia in adults. http://www.uptodate.com/home/index.html. Accessed March 23, 2011.
- Mandell LA, et al. Pneumonia. In: Fauci AS, et al. Harrison's Online. 17th ed. New York, N.Y.: The McGraw-Hill Companies; 2008. http://www.accessmedicine.com/content.aspx?aid=2899132. Accessed April 5, 2011.
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