Conjunctivitis is a common condition that causes redness and inflammation of the thin layer of tissue that covers the front of the eye (the conjunctiva). People often refer to conjunctivitis as red eye. Other symptoms of conjunctivitis include itchiness and watering of the eyes, and sometimes a sticky coating on the eyelashes (if it's caused by an allergy). Read to learn more about symptoms, causes, diagnosis, treatment and complications.

Infective conjunctivitis is an infection of the conjunctiva (the front skin of the eye). It is very common. One or both eyes become red or pink, they may be sticky or watery and may have surface irritation. Most cases clear in a few days without any treatment. Antibiotic drops or ointments may be advised if the infection is severe or does not settle.

Allergic conjunctivitis causes red, watery, itchy or gritty eyes. The condition is not usually painful and does not make eyes sensitive to light. It does not affect vision. The most common cause is an allergy to pollen in the hay fever season.