Productive cough is often normal after an infection, but if it persists or has alarming features, it may indicate a respiratory disease requiring evaluation.
In this article
Key takeaways
- Productive cough helps clear airways
- If lasting >3 weeks, evaluate
- Phlegm colour gives clues
- Haemoptysis (blood) always requires consultation
- Common in COPD and bronchiectasis
When it's normal
After a respiratory infection (cold, flu, acute bronchitis), productive cough can last 2-3 weeks. If it decreases progressively, usually benign.
What colour indicates
- White/clear: usually viral or irritative
- Yellow/green: may indicate bacterial infection
- Rust-coloured: classic pneumococcal pneumonia
- Brown: old blood, smokers
- Pink foamy: pulmonary oedema (urgent)
- Red: haemoptysis (consult)
Common causes
- Acute or chronic bronchitis
- COPD
- Asthma
- Bronchiectasis
- Pneumonia
- GERD
- Smoking
- Tuberculosis (rare)
When to consult
With productive cough lasting >3 weeks, with blood, persistent fever, dyspnea or weight loss, pulmonary evaluation needed.
Warning signs
- Blood in expectoration
- Unexplained weight loss
- Night sweats
- Persistent fever
- Progressive dyspnea
- Chest pain
- Cough in smoker >3 weeks
Do you have persistent productive cough?
The pulmonology team at Clínica Eupnea offers comprehensive cough evaluation and causes.
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