Despite how you may feel, you're not the only one suffering from the runny or stuffy nose and dry, red eyes of nasal allergies. At least 25% to 30% of the US population has allergic rhinitis, and the number is rising. Recent studies in the US and Europe suggest that as many as 1 out of every 4 people may suffer from seasonal and year-round nasal allergies. That makes it the most common chronic respiratory illness.