(HealthDay News) -- Pneumonia is a lung infection caused by a bacterium, virus or fungus. Often, the lungs' air sacs fill with fluid or pus, making it difficult to breathe.
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The National Heart Lung and Blood Institute says risk factors for pneumonia include:
- Being 65 or older, or a baby aged 2 years or younger. Both age groups tend to have weaker immune systems.
- Having a lung disease or condition that affects breathing, including cystic fibrosis, chronic obstructive pulmonary disease or asthma.
- Having a chronic disease such as heart failure, diabetes or sickle cell anemia.
- Being in a hospital's intensive care unit, particularly if you need a ventilator to breathe.
- Having certain complications of stroke, including coughing or problems swallowing.
- Being malnourished.
- Smoking or drinking too much alcohol.
-- Diana Kohnle
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