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​Symptoms and Signs – Differential Diagnosis of  Allergic Rhinitis
• Infections (sinusitis; viral, bacterial, or fungal rhinitis)
• Rhinitis medicamentosa (cocaine, sympathomimetic nasal drops)
• Septal obstruction (e.g., deviated septum), nasal polyps, nasal neoplasms
• Systemic diseases (e.g., Wegener’s granulomatosis, hypothyroidism [rare])
• Vasomotor rhinitis (e.g., secondary to air pollutants)
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