Pneumonia is a breathing (respiratory) condition in which there is an infection of the lung.
This article covers community-acquired pneumonia (CAP). This type of pneumonia is found in persons who have not recently been in the hospital or another health care facility such as a nursing home or rehab facility. Pneumonia that affects persons in health care facilities is called hospital-acquired pneumonia.
Pneumonia is a common illness that affects millions of people each year in the United States. Germs called bacteria, viruses, and fungi may cause pneumonia. In adults, bacteria are the most common cause of pneumonia.
Ways you can get pneumonia include:
Pneumonia can be caused by many types of germs.
Risk factors that increase your chances of getting pneumonia include:
The most common symptoms of pneumonia are:
Other symptoms include:
The health care provider will listen crackles or abnormal breath sounds when listening to your chest with a stethoscope. Tapping on your chest wall (percussion) helps the health care provider listen and feel for abnormal sounds in your chest.
The health care provider will likely order a chest x-ray if pneumonia is suspected.
Other tests that may be ordered include:
Your doctor must first decide whether you need to be in the hospital. If you are treated in the hospital, you will receive:
It is very important that you are started on antibiotics very soon after you are admitted. If you have viral pneumonia, you will not receive antibiotics. This is because antibiotics do not kill viruses. You will receive other medicines.
You are more likely to be admitted to the hospital if you:
Many people can be treated at home. If so, your doctor may tell you to take antibiotics.
When taking antibiotics:
Breathing warm, moist (wet) air helps loosen the sticky mucus that may make you feel like you are choking. These things may help:
Drink plenty of liquids, as long as your health care provider says it is OK:
Get plenty of rest when you go home. If you have trouble sleeping at night, take naps during the day.
With treatment, most patients will improve within 2 weeks. Elderly or very sick patients may need longer treatment.
Those who may be more likely to have complicated pneumonia include:
In all of the above conditions, pneumonia can lead to death, if severe.
In rare cases, more severe problems may develop, including:
Your doctor may order another x-ray. This is to make sure your lungs are clear. But it may take many weeks for your x-ray to clear up.
Call your doctor if you have:
You can help prevent pneumonia by following the measures listed below.
Wash your hands often, especially after:
Remember to wash your hands before eating or preparing foods.
Do not smoke. Tobacco damages your lung's ability to fight infection.
Vaccines may help prevent some types of pneumonia.
Be sure to get the following vaccines:
Vaccines are even more important for the elderly and people with diabetes, asthma, emphysema, HIV, cancer, persons with organ transplants, or other long-term conditions.
Bronchopneumonia; Community-acquired pneumonia; CAP
Limper AH. Overview of pneumonia. In: Goldman L, Schafer AI, eds. Goldman’s Cecil Medicine. 24th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 97.
Niederman M. In the clinic. Community-acquired pneumonia. Ann Intern Med. 2009;151(7).
Torres A, Menandez R, Wunderink R. Pyogenic bacterial pneumonia and lung abscess. In: Mason RJ, Broaddus VC, Martin TR, eds., et al. Murray & Nadel's Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa.: Elsevier Saunders; 2010:chap 32.
Updated by: Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.
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