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10 Sinus Infection Symptoms
Your mucus is yellow or greenish
A colored dischargeas opposed to clear mucusfrom the nose or down the back of your throat is another sign you may have a sinus infection, although it’s not always an indication that you need treatment.
Discoloration is actually caused by white blood cells. In other words, it is a sign that the immune system is already fighting the infection. In fact, the yellow or green tinge can stick around for a few days or even weeks after the infection is over because immune cells are still draining. "It’s basically pus," Dr. Papa says.
Next: Your nose is stuffy
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