Conjunctivitis is inflammation of the conjunctiva, the thin membrane covering the white of the eye and the inside of the eyelids. It is the most frequent cause of a red eye. Three main causes are distinguished, and treatment depends on them.
Viral
The most frequent and highly contagious: a red, watery eye, often bilateral within days, in the context of a cold. Treatment: saline rinses and strict hand hygiene; spontaneous recovery in 1 to 2 weeks. See the dedicated page →
Bacterial
Purulent (yellowish) discharge, eyelids stuck together on waking. An antibiotic eye drop may be prescribed after examination. See the dedicated page →
Allergic
Itching is the main feature, bilateral involvement, often seasonal (pollens) or related to dust mites. Treatment: allergen avoidance, antihistamine eye drops, eye rinses. See the dedicated page →
Frequently asked questions
When to seek advice quickly?
In case of marked eye pain, reduced vision, photophobia (light sensitivity), contact lens wear, or if symptoms persist despite treatment: these signs are not those of simple conjunctivitis and require an eye examination.
Learn more
Viral conjunctivitis
The most frequent and highly contagious form: duration, good habits, warning signs.
Bacterial conjunctivitis
Purulent discharge, sticky eyelids: when is an antibiotic useful?
Allergic conjunctivitis
Itching, pollen, dust mites: relieving symptoms and preventing flare-ups.
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