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Along with a runny nose and sore throat, green phlegm is another cold-like symptom of COVID-19. Interestingly, the color of the mucus is an important indicator when it comes to infection.
Phlegm is more related to disease than mucus, and can be troublesome for the individual to excrete from the body. Phlegm is a thick secretion in the airway during disease and inflammation. Phlegm usually contains mucus with virus, bacteria, other debris, and sloughed-off inflammatory cells.
If you experience difficulty breathing, develop a severe cough, notice thick green or yellow mucus, run a fever, and/or feel extremely fatigued. If your symptoms worsen instead of improve over time.
Having green, yellow, or thickened phlegm (sputum) does not always indicate the presence of an infection. Also, if an infection is present, the color of the phlegm (sputum) does not determine whether a virus, a bacterium or another pathogen has caused it. Simple allergies can also cause changes in the color of the mucus. [1]
Yellowish mucus typically means that your white blood cells are "fighting off an illness or infection," says Nasseri. "Most commonly this is linked to the common cold and will likely clear on its own.
A dry cough is a persistent cough where no mucus is present; this can be a sign of an infection. A chronic wet cough is a cough where excess mucus is present; depending on the colour of the phlegm, bacterial infections may be present. [16] A stress cough is when the airways of the throat are blocked to the point that it causes a reflexive spasm.
Excess mucus can narrow the airways, thereby limiting airflow and accelerating the decline in lung function, and result in COPD. [35] [40] Excess mucus shows itself as a chronic productive cough and its severity and volume of sputum can fluctuate in periods of acute exacerbations. [35]
A post-viral cough is a lingering cough that follows a viral respiratory tract infection, such as a common cold or flu and lasting up to eight weeks. Post-viral cough is a clinically recognized condition represented within the European medical literature. Patients usually experience repeated episodes of post-viral cough.
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