Symptoms of allergic conjunctivitis include redness, watering, itching, stinging and swelling, according to the American Academy of Family Physicians. There may also be pus discharge. Allergic conjunctivitis is often confused with other forms of the disorder, but if the eyes are itchy, it's likely due to an allergic reaction, reports the American Academy of Allergy, Asthma and Immunology. Allergic conjunctivitis is not contagious.

Non-allergic conjunctivitis causes a burning or scratchy feeling in the eyes, and is contagious.

Common triggers are pollen, animals, perfumes, air pollution, smoke and some skin medicines.

Over-the-counter and prescription eye drops are available to treat allergic conjunctivitis and may contain an antihistamine, decongestant, anti-inflammatory medication or a combination of these. Some of these drops may sting or burn when you first put them in. Oral antihistamines, which help control your allergies, may also decrease the symptoms of allergic conjunctivitis.

A cold washcloth placed over your eyes may also make them feel better, at least temporarily. And, if you're having symptoms of allergic conjunctivitis it's a good idea to skip wearing contact lenses until your eyes are feeling better.

More information

To learn more about allergic conjunctivitis, visit the American Academy of Allergy, Asthma and Immunology.

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