What is the first treatment tried for allergic conjunctivitis?

Allergic conjunctivitis is an allergic reaction affecting the thin surface covering the eye. It commonly causes itching, watering, redness, and puffy eyelids, often in both eyes. Rubbing can increase irritation and may transfer germs to the eye.

Treatment depends on the pattern and severity of symptoms. A clinician or pharmacist may recommend an antihistamine or mast-cell stabilising eye drop, an oral allergy medicine, or artificial tears. More information about options is available under [Allergy Medication](/treatments/medical-management/allergy-medication/).

Use a cool clean compress, wash your hands before touching your eyes, and keep windows closed when outdoor allergens are high. Avoid contact lenses while the eyes are irritated unless an eye professional says they are suitable. Do not share towels, eye drops, or cosmetics, and replace eye makeup that may be contaminated.

Use drops exactly as directed and check whether they are safe with contact lenses. If the trigger is unclear or symptoms return repeatedly, [Allergy Testing](/treatments/diagnostics-and-screening/allergy-testing/) may help guide avoidance advice.

Seek urgent eye care for significant eye pain, light sensitivity, reduced or blurred vision that does not clear with blinking, injury, or a feeling that something is stuck in the eye. Arrange a review if symptoms affect one eye only, produce thick discharge, or do not improve with appropriate allergy care.

Does this look like allergy rather than infection or another eye condition? Which drops fit my age, medicines, and contact-lens use? How can I identify or avoid the trigger?