10 Sinus Infection Symptoms

If you've been congested or had other symptoms for weeks, you may have a sinus infection.

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Your mucus is yellow or greenish

A colored discharge—as opposed to clear mucus—from 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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