Inflammation of the sinuses could be due to an allergy, an infection, or ongoing exposure to an irritant, such as pollution or smoke. Symptoms can include a headache
or pressure in the area of the sinuses, a stuffy nose, achy teeth, an odor coming from the nose, postnasal drip, cough,
sore throat, laryngitis,
lightheadedness, constant low fever, and thick, yellow to green nasal drainage. This inflammation can block sinus drainage and cause a stuffy nose.