Phlegm (foul-smelling)
Foul-smelling phlegm indicates a significant infection in the lungs or airways, such as a lung abscess or anaerobic bacterial infection. The odour comes from bacterial breakdown of tissue. This is a serious symptom that needs prompt medical attention.
Conditions that commonly cause phlegm (foul-smelling)
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Common Causes of Phlegm (foul-smelling)
- Lung abscess
- Anaerobic bacterial pneumonia
- Bronchiectasis with secondary infection
- Aspiration pneumonia
- Advanced tuberculosis
When to Seek Urgent Medical Care for Phlegm (foul-smelling)
These signs may indicate a serious problem — don't wait, seek medical care right away:
- Any foul-smelling phlegm should be evaluated promptly
- Phlegm with blood or rust-coloured streaks
- High fever with night sweats and weight loss
- Chest pain and difficulty breathing
- Persistent cough lasting more than 2 weeks
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