Phlegm (yellow or green)
Yellow or green phlegm usually signals that your immune system is actively fighting a respiratory infection. White blood cells give the mucus its colour. While often viral, persistent coloured phlegm may indicate a bacterial infection needing treatment.
Conditions that commonly cause phlegm (yellow or green)
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Common Causes of Phlegm (yellow or green)
- Bacterial sinusitis
- Bacterial bronchitis
- Pneumonia
- Chronic bronchitis flare-up
- Tuberculosis
When to Seek Urgent Medical Care for Phlegm (yellow or green)
These signs may indicate a serious problem — don't wait, seek medical care right away:
- Yellow or green phlegm lasting more than 10 days
- High fever with coloured phlegm
- Blood streaks in the phlegm
- Severe chest pain or difficulty breathing
- Recurrent episodes of coloured phlegm production
Ready to address phlegm (yellow or green)?
Book a consultation with our clinical team. We'll assess your reports and recommend the right treatment path.