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What causes conjunctivitis?

Conjunctivitis occurs when the thin layer of cells that line your eye, called the conjunctiva, become inflamed. This can be caused by an infection with bacteria or viruses, or by allergens and other substances that come into contact with the eye and cause irritation.

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About this article

Author: Dr Idan Ben-Barak PhD, MSc, BSc (Med)
First answered: 13 Jul 2015
Last reviewed: 14 May 2019
Rating: 4.8 out of 5
Votes: 316 (Click smiley face below to rate)
Category: Eye injuries


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