MadSci Network: General Biology

Re: why is ill people's snivel yellow or green?

Date: Mon Mar 12 08:41:22 2001
Posted By: Lillian Mundt, Faculty, Clinical Laboratory Sciences Department
Area of science: General Biology
ID: 984221657.Gb

If Becky is referring to nasal drainage this is the explaination:

The fluid in our sinuses is normally clear and colorless.  When someone has 
a sinus infection it may become cloudy due to white blood cells collecting 
there to fight the infection.  The abnormal colors observed are a result of 
the bacteria and the toxins they make. Different bacteria or viruses 
produce substances with different characteristics. Also, if there is nasal 
or sinus trauma (like when we blow our nose too hard) there may be blood in 
this fluid.

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