Is pink eye contagious and how do I treat it?

What the evidence says

Yes, most pink eye is contagious. Viral and bacterial conjunctivitis spread easily through direct contact with eye discharge, contaminated hands, shared towels or pillows, or respiratory droplets from coughing and sneezing. Allergic pink eye, caused by things like pollen or pet dander, is not contagious at all.

Treatment depends on the cause. Viral pink eye, the most common type, usually resolves on its own in about one to two weeks and doesn't need antibiotics; cool or warm compresses and gentle cleaning with a clean, damp cloth can help with comfort. Bacterial pink eye may be treated with antibiotic eye drops or ointment if a doctor diagnoses it, though many mild cases improve without antibiotics too.

Allergic pink eye is treated with antihistamines (oral or eye drops) and by avoiding the trigger. To limit spread at home, wash hands frequently, avoid touching or rubbing the eyes, and don't share towels, pillows, washcloths or makeup. Kids with bacterial pink eye can usually return to school or daycare 24 hours after starting antibiotic drops; with viral pink eye, Canadian guidance says kids don't need to be kept out for the whole contagious period, but check your local childcare or school policy.

See a doctor if there's vision change, significant eye pain, eyelid swelling, the pink eye keeps coming back, or your child seems unwell with fever - these can point to something more serious than simple pink eye.