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Conjunctivitis (kuhn-juhngk-tuh-´vahy-tis) is an inflammation (swelling) or infection of the thin layer (conjunctiva) that lines the inside of the eyelid and covers the white part of the eye. Inflammation can cause blood vessels in the eye to become larger. And that can make the white of the eye look pink or red. Thus, conjunctivitis is often called pink eye or red eye.

Information for healthcare professionals on the causes of viral, bacterial, and allergic conjunctivitis.

List of publications and references used throughout conjunctivitis site

Viral conjunctivitis can usually be diagnosed from the typical signs and symptoms. Bacterial conjunctivitis can be diagnosed by a healthcare provider from the typical symptoms.

Prevent or reduce the risk of spreading or getting conjunctivitis by following some simple good hygiene steps.

The treatment for conjunctivitis depends on the cause.

onjunctivitis is most commonly caused by viruses or bacteria. But there are other causes, allergens, chemicals, fungi, certain diseases, and contact lens use (especially the extended-wear type).

Neonatal conjunctivitis (pink eye) is a red eye(s) in a newborn caused by infection, irritation, or a blocked tear duct. When caused by an infection, neonatal conjunctivitis can be very serious.