Most types of pneumonia resolve within a week or two, although a cough may linger for several weeks more. In severe cases, it may take longer to completely recover.
When a person has pneumonia, lung tissue can fill with pus and other fluid, which makes it difficult for oxygen in the lung's air sacs to reach the bloodstream.
**Double pneumonia** simply means that the infection is in both lungs. It's common for pneumonia to affect both lungs, so don't worry if your doctor says this is what you have — it doesn't mean you're twice as sick.
**Walking pneumonia** refers to pneumonia that is mild enough that you may not even know you have it.
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