What should you know about mild allergic conjunctivitis?

The clear surface and lining of the eye react to triggers such as pollen, dust or animal dander. Itching is often more prominent than pain, and symptoms may affect both eyes. Watery discharge, redness, puffy eyelids and a gritty feeling can occur; [Itchy Eyes](/symptoms/itchy-eyes/) and [Red Eye](/symptoms/red-eye/) describe these symptoms. Nasal sneezing or congestion may accompany the eye reaction, as with [Allergic Rhinitis](/conditions/allergic-rhinitis/). Allergic conjunctivitis is different from an eye infection, although discharge can make the distinction less obvious.

Avoid rubbing your eyes, wash your hands after outdoor exposure and use a cool clean compress over closed eyelids. Keep windows closed when outdoor triggers are high, and consider glasses outdoors. A pharmacist or clinician can advise whether lubricating drops or allergy medication is suitable; do not share eye drops or use someone else’s prescription. If the trigger is unclear or symptoms keep returning, [Allergy Testing](/treatments/diagnostics-and-screening/allergy-testing/) may help guide avoidance.

Arrange medical advice if symptoms persist, recur frequently, or include significant [Eye Discharge](/symptoms/eye-discharge/). Seek urgent assessment for eye pain, light sensitivity, vision change, marked swelling, injury, or one very red eye. Contact lens wearers with a painful or red eye should seek prompt care and remove lenses. These features may point beyond a mild allergy.

What trigger is most likely? Are my drops suitable for regular use? How can I tell allergy from infection, and when should I have testing?