Pink Eye (Conjunctivitis): Causes and Treatment in Canada

Pink eye (conjunctivitis) is a common eye condition causing redness, itching, and discharge. It can be viral, bacterial, or allergic - and treatment depends on the cause. Viral conjunctivitis is the most common type. It produces watery discharge, affects one or both eyes, and often accompanies a cold. It is highly contagious and resolves on its own within 1 to 2 weeks. No antibiotic drops are needed. Bacterial conjunctivitis produces thick, yellow-green discharge, may cause the eyelids to stick together in the morning, and may require antibiotic eye drops or ointment prescribed by a physician. Allergic conjunctivitis causes itching, tearing, and swelling, typically affects both eyes, and improves with antihistamine eye drops and allergen avoidance. When to see a doctor: if you have severe pain, blurred vision, sensitivity to light, thick green or yellow discharge, or if symptoms do not improve within 2 to 3 days. For children in school or daycare, most Canadian school policies require children with bacterial conjunctivitis to stay home until 24 hours of antibiotic treatment have been completed. A physician can assess eye symptoms through telehealth using photos and symptom descriptions. *This article is for informational purposes only.*

This article is for informational purposes only and does not constitute medical advice. Content reviewed by licensed Canadian physicians. Last updated February 2026.