Pneumonia is a lung infection caused by germs. It can occur on its own or as a result of infections like influenza.
According to Allure, it's one of the most common reasons people end up in the hospital.
Pneumonia is an infection of the lungs, so it typically comes with breathing-related symptoms.
Coughing up lots of phlegm, shortness of breath, and sometimes chest pain due to lung irritation are common symptoms.
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