The symptoms can affect either one or both sides of the head. Severe cases may involve the eye. Bacteria, viruses and fungi cause sinusitis. Common bacterial causes are Haemophilis influenzae, Moraxella cararrhalis or Streptococcus. Common viral casuses are rhinovirus, influenza virus and parainfluenza virus.
Fungal infections are uncommon.
Chronic sinusitis may be caused by a structural abnormality of your nose or sinuses. Nasal polyps, a deviated septum or abnormal drainage may be a cause of chronic sinus problems. Return to top of page Treatment options Bacterial sinusitis is treated with oral antibiotics for up to 3 weeks. Since antibiotics work differently, your doctor will choose an antibiotic that is right for you. Your doctor may decide to change antibiotics during your treatment depending on how you respond.