Viral infections are the most common cause of sinusitis, accounting for about 90% of cases.

Sinusitis can cause a variety of symptoms, including nasal congestion, facial pain, headache, and fever.

Acute sinusitis is a short-term infection of the sinuses that lasts less than 4 weeks. Chronic sinusitis is a long-term infection of the sinuses that lasts more than 12 weeks.

Allergies, asthma, and cystic fibrosis are all risk factors for developing sinusitis.

Sinusitis is diagnosed based on a physical examination, imaging tests, and nasal endoscopy.

The most common treatment for sinusitis includes antibiotics, decongestants, and pain relievers.

Surgery may be considered for sinusitis when antibiotics and other treatments fail, when the infection is severe, or when there is a structural abnormality in the sinuses.

Sinusitis can lead to a number of complications, including meningitis, brain abscess, and orbital cellulitis.

Sinusitis can be prevented by washing hands frequently, avoiding contact with sick people, and getting vaccinated against the flu.

Most people recover completely from sinusitis, but some people may experience chronic sinusitis. In rare cases, sinusitis can be fatal.