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 August 2026.