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  1. Acute sinusitis - Diagnosis and treatment - Mayo Clinic

  2. Chronic sinusitis - Diagnosis and treatment - Mayo Clinic

  3. Chronic sinusitis - Symptoms and causes - Mayo Clinic

  4. Acute sinusitis: Do over-the-counter treatments help?

  5. Acute sinusitis - Symptoms and causes - Mayo Clinic

  6. Sinus headaches - Symptoms & causes - Mayo Clinic

  7. Sinus headaches - Diagnosis & treatment - Mayo Clinic

  8. Nonallergic rhinitis - Diagnosis & treatment - Mayo Clinic

  9. Pseudoephedrine (oral route) - Mayo Clinic

  10. Nasal polyps - Diagnosis and treatment - Mayo Clinic