2. What Green Phlegm Means

Green phlegm means that your infection has gotten worse, not better. White blood cells fighting the infection causes the green color. The infection may be either bacterial or viral, which means if viral, antibiotics will not affect it. Green phlegm is usually a sign of one of the following:

  • Sinusitis
  • Pneumonia
  • Bronchitis
  • Cystic fibrosis

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