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  1. Acute sinusitis - Symptoms and causes - Mayo Clinic

  2. Chronic sinusitis - Symptoms and causes - Mayo Clinic

  3. Acute sinusitis - Diagnosis and treatment - Mayo Clinic

  4. Chronic sinusitis - Diagnosis and treatment - Mayo Clinic

  5. Sinus headaches - Symptoms & causes - Mayo Clinic

  6. Hay fever - Symptoms and causes - Mayo Clinic

  7. Nasal polyps - Symptoms and causes - Mayo Clinic

  8. Mayo Clinic Q and A: Sinusitis and treatment options

  9. Allergies - Symptoms and causes - Mayo Clinic

  10. Nonallergic rhinitis - Symptoms & causes - Mayo Clinic