What are the signs and symptoms of acute sinusitis?

Multiple: Congestion, purulent nasal discharge, facial pain or pressure over frontal or maxillary sinuses. This pain can also be felt around temporal area, and can lead to tooth sensitivity or pain. Fever is somewhat rare. Usually the longer you have had the symptoms, the more likely it is bacterial (vs viral or even plain allergies).

Following a URI: Acute sinusitis most commonly follows a cold so if you've had cold type symptoms for greater than two weeks, it might be sinusitis. Pressure, pain, drainage and discolored secretions are all non-specific symptoms and don't necessarily indicate sinusitis.