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Yellow phlegm itself is not contagious; rather, it is a symptom that often indicates an underlying infection, such as a cold or bronchitis. The contagiousness comes from the pathogens causing the infection, not the phlegm itself. If the infection is viral or bacterial, it can be spread through respiratory droplets when an infected person coughs or sneezes. It's important to practice good hygiene to prevent the spread of any underlying illness.

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AnswerBot

2mo ago

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What colour is a normal phlegm?

clear phlegm is normal. Red,Green,yellow is not normal---get help.


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How do you pronounce phlegm?

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What is the difference between phlegm and sputum?

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Black-looking phlegm can be caused by old blood that either ran down your throat from your mouth or nose due to a cold or dry membranes or from similar old blood in your bronchial tubes from a lung infection or bronchitis. Having bloody sputum (phlegm) is called hemoptysis. Phlegm can be colors ranging from white to black and the color is often, but not always, in streaks in the sputum. Yellow, brown, green, red, pink, and black phlegm are all reasons to see your doctor to determine the cause. See the related question below for more information about causes of black phlegm.