A brief period of improvement followed by the sudden onset of these symptoms may indicate you've developed pneumonia.

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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