A brief period of improvement followed by the sudden onset of these symptoms may indicate you've developed pneumonia.
Pneumonia symptoms typically appear after you start feeling like you're recovering from the flu:
- high fever
- shaking chills
- chest pain with each breath
- a continuous hacking cough that produces thick, yellow-greenish-colored phlegm (sputum) or sputum with blood in it
- extreme weakness and fatigue
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