Having Symptoms that Persist for Over Two Weeks
Cold or other symptoms that persist for a long time may be a sign of sinus infection. A normal common cold usually lasts for about 7 to 14 days. On the other hand, acute sinusitis may take a month to disappear. Chronic sinusitis may last for about 4 to 12 weeks and may even persist for years.
Thick, Colored Nasal Discharge
People with a sinus infection usually have a thick, colored liquid coming out of their nasal passages. It is one of the most significant symptoms of sinusitis. The discharge may appear greenish, yellowish, or cloudy-looking. It may also contain traces of blood.