Rhinitis is what is described as a condition that can cause swelling, reddening, and irritation of the nose and eyes. This condition can be caused by allergens in the aerial particularly dust particles, dander from animals, or even pollen due to definite plants if people are allergic to them. You can also have Rhinitis and not be allergic to anything at all it can be caused from blockages in the nasal passageway due to injury or from birth. You will know when you have Allergic Rhinitis when your eyes begin to water and itch, your nose begins to run and itch, you might start coughing or sneezing, and it will complete be accompanied by nasal congestion, or, a stuffy nose.