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  1. Chronic sinusitis - Symptoms and causes - Mayo Clinic

  2. Sinus Infection (Sinusitis): Causes, Symptoms & Treatment

  3. Acute sinusitis - Symptoms and causes - Mayo Clinic

  4. Sinus Infection (Sinusitis): Symptoms, Causes, Duration, and

  5. Acute sinusitis - Diagnosis and treatment - Mayo Clinic

  6. Sinusitis | Johns Hopkins Medicine

  7. Sinusitis - Wikipedia

  8. Sinus Infection: Symptoms, Causes, and Treatment - Healthline

  9. Sinusitis | Sinus infection Symptoms - MedlinePlus

  10. Chronic Sinusitis: Symptoms, Causes & Treatment - Cleveland Clinic