Pink Eye in Kids and Adults: Is It Bacterial, Viral, or Allergic?

Bacterial, Viral, or Allergic? The Quick Answer

Pink eye, or conjunctivitis, is inflammation of the thin membrane covering the white of the eye and the inner eyelid. It comes in three main forms, and the discharge is your best clue. Thick, yellow or green pus that keeps the eyelids stuck together, especially in one eye, points toward bacterial conjunctivitis. Watery discharge with a gritty, burning feeling, often alongside a cold or sore throat and spreading from one eye to the other, usually means viral conjunctivitis. Itchy, watery eyes in both eyes at once, paired with sneezing or a runny nose, typically signals allergic conjunctivitis.

Here's the part that surprises many parents. Most pink eye doesn't need antibiotics. Viral conjunctivitis is the most common type and resolves on its own in one to two weeks, much like a cold. Allergic conjunctivitis isn't an infection at all and responds to antihistamines and avoiding triggers. Even mild bacterial cases often clear without treatment. Antibiotic eye drops are reserved for bacterial infections that are more severe, persistent, or occurring in specific situations. The challenge is that these types can look alike, and telling them apart sometimes takes a trained eye.

Is Pink Eye Contagious, and Can Kids Go to School?

Both viral and bacterial conjunctivitis are contagious. They spread through direct contact with eye discharge, then through hands, shared towels, pillowcases, or toys. This is why it moves so quickly through daycares and classrooms. Allergic conjunctivitis, on the other hand, is not contagious at all, since it's an immune reaction rather than an infection.

For school, guidance in Ontario has shifted over the years. Many public health bodies no longer require children to stay home for mild pink eye, since the infection is often already spreading before symptoms appear and keeping kids out doesn't reliably stop it. That said, individual schools and daycares in Toronto often set their own rules, and some ask for a note or a period at home until symptoms improve. The most reliable step is good hand hygiene, not sharing towels, and keeping hands away from the face. Frequent handwashing does more to slow the spread than anything else.

How to ease symptoms at home

Whatever the cause, a few simple measures help. A clean, warm compress loosens crusting on the lids, while a cool compress soothes the itch and swelling of allergies. Wipe gently from the inner corner outward with a fresh cloth or cotton pad each time. If your child wears contact lenses, switch to glasses until the eye is fully healed and replace the lens case. Over-the-counter lubricating drops can ease the gritty feeling of a viral case. If you're pregnant, breastfeeding, or planning a pregnancy, check with your provider before starting any new medication, including allergy eye drops.

When Antibiotics Actually Help

Antibiotic eye drops treat bacterial conjunctivitis, and they do nothing for viral or allergic pink eye. Because viral cases are far more common, reaching for antibiotics too quickly is a common mistake that doesn't speed recovery and can contribute to antibiotic resistance. Your provider will weigh the pattern of symptoms, how long they've lasted, and whether there are risk factors before deciding whether drops make sense.

There are situations where prompt assessment matters more. Newborns with pink eye, contact lens wearers with a red painful eye, anyone with significant eye pain, light sensitivity, or changes in vision, and cases that worsen despite home care all warrant a closer look. Pediatric management can differ from adult care, so it's worth checking with a provider for a child rather than assuming what worked for an adult applies. If you take other medications, your provider can help you choose options that won't cause interactions.

This is where getting a real assessment pays off. A quick conversation with a Nurse Practitioner in a family practice setting can sort out whether you're looking at a self-limiting virus or a bacterial infection that needs drops, and can rule out the more serious eye problems that occasionally masquerade as pink eye.

When to See Your Nurse Practitioner

See a provider if there's eye pain, vision changes, sensitivity to light, heavy pus, symptoms lasting beyond a week or two, or pink eye in a newborn. OHIP walk-in clinics are one route, though wait times and rotating providers can make them frustrating when you have a squirming toddler and a work deadline. Care& offers another path for families who want unrushed, appointment-based visits with a Nurse Practitioner who knows their history. Care& is a membership-based practice and is not covered by OHIP, and its pediatric care is designed so children can be assessed in person or by video, with any needed prescription sent to your pharmacy. You can see how the Care& model works if you're weighing your options.

Frequently Asked Questions