Symptoms can include a headache or pressure in the area of the sinuses, a stuffy nose, achy teeth, postnasal drip, cough, sore throat, laryngitis
, constant low fever, and thick, yellow to green nasal drainage. The most common cause of sinusitis is an infection, especially when the mucus is green. Sinus infections can be difficult to treat since they respond slowly. When a bacterial infection is the cause you may need to take an antibiotic for at least 3 weeks.