It could mean that there is a sinus infection. It would be a good idea to make an appointment with a ENT (Ear, nose & throat) specialist to determine if you would need a course of antibiotics, which is the usual treatment, especially if the discharge is thick, yellow or green.
Here is some info, let me know if you have questions:
http://www.intelihealth.com/IH/ihtIH?t=31675&p=~br,IHW|~st,9023|~r,WSIHW000|~b,*|
http://www.emedicinehealth.com/sinus_infection/article_em.htm
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