Symptoms can include a headache or pain in the area of the affected sinus, nasal
congestion, postnasal drip
, sore throat, laryngitis, and thick, yellow
to green nasal drainage.
The most common cause of sinusitis is an infection, especially when the mucus is green or odorous. However, inflammation of the sinuses could also be due to an allergy or chronic exposure to an irritant, such as pollution or smoke. Sinus infections can be difficult to treat since they respond slowly.