4. Your breathing is difficult.
The difference between the flu and pneumonia is that your breathing can become labored in pneumonia. You might feel weak because you’re not breathing correctly. When you feel shortness of breath and you’re coughing up stuff, it’s time to talk to a doctor and see whether you’ve got pneumonia or not.
It’s important to make the distinction between the flu and pneumonia, because you might be able to get treated efficiently if it’s bacterial pneumonia, and there are no good treatments for viruses like the flu.
It’s important to know which condition you have, and breathing difficulty is one sign of pneumonia.