Depending on the severity of the cough and the progress of the infection, some people with walking pneumonia have trouble breathing. A variety of factors can lead to shortness of breath, including breathing passage blockages and heart conditions. Extra mucus production and inflammation during a bout of pneumonia narrow the airways. People may need to exert more effort than usual to fill the lungs with oxygen, and this can increase the difficulty of the simplest actions. Shortness of breath is a serious symptom of walking pneumonia and calls for medical attention.

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