Viral Conjunctivitis: Symptoms and How It Spreads

Symptoms of viral conjunctivitis include sudden red eyes, a foreign-body sensation, intense watering, burning, itching, light sensitivity, and watery discharge without pus. It is the most common infectious form — StatPearls credits it with up to 75% of infectious conjunctivitis — and most cases stay highly contagious for 10 to 14 days.

Symptoms of viral conjunctivitis

• Redness in the eye, from dilation of the conjunctival vessels
• Intense watering with watery discharge, no pus
• Burning, gritty, or foreign-body sensation, usually of sudden onset
• Itching
• Light sensitivity
• A tender, swollen lymph node in front of the ear (preauricular), the most useful sign for telling viral from bacterial
• Usually starts in one eye; the other typically becomes symptomatic 1 to 2 days later

Unlike bacterial conjunctivitis, discharge from the viral form tends not to be thick or colored — it’s watery, and the eyelids are not glued shut in the morning.

Why it spreads so easily

Up to 90% of viral conjunctivitis is caused by adenovirus, the same family behind many colds and upper respiratory infections. That explains why it tends to appear along with respiratory symptoms and why it spreads so easily: transmission happens by direct contact, by airborne route, and through reservoirs such as swimming pools, as well as through hands, discharge, and contaminated objects like towels, pillowcases, and doorknobs. StatPearls puts the highly contagious window at 10 to 14 days — longer than most people assume.

Viral vs. bacterial conjunctivitis: what changes

Sign	Viral	Bacterial
Discharge	Watery	Purulent, thick, re-forms after wiping
Eyelids on waking	Crusting possible, not glued	Glued shut, a top predictor of a bacterial case
Preauricular lymph nodes	Commonly swollen and tender	Uncommon
Treatment	Supportive care only	Topical antibiotics or watchful waiting, case by case
Context	Often comes with a cold or sore throat	Isolated, peaks December to April

How to care for viral conjunctivitis

1. There’s no antibiotic for viruses — treatment targets symptom relief: artificial tears four times a day (more if needed) and cold compresses.
2. Wash your hands often, especially after touching your eyes. This is the single measure StatPearls names for preventing transmission.
3. Avoid sharing towels, pillowcases, glasses, or makeup while symptoms last.
4. Stay away from close contact while the eye is symptomatic. StatPearls advises refraining from work or school until symptoms resolve; in practice, US schools and workplaces set their own exclusion policies, so check yours.
5. Don’t use steroid eye drops on your own — under steroids a patient may keep shedding virus, and the drops carry their own risks to eye pressure and healing.
6. Take your contact lenses out and leave them out until the eye is completely quiet.

When to seek care

Resolution can take up to three weeks, so slow improvement is not by itself a bad sign. See an eye doctor if vision drops, if eye pain is more than discomfort, if light sensitivity is severe, or if the eye is not clearly improving after three weeks. Any red eye in a contact lens wearer gets evaluated the same day. Corneal involvement — subepithelial infiltrates, which blur vision and worsen glare — is the complication being ruled out, and it can leave symptoms running 14 to 30 days in the epidemic keratoconjunctivitis form.

This content is informational and does not replace medical consultation, diagnosis, or treatment. See the overview in conjunctivitis symptoms: signs, types, what to do, compare with bacterial conjunctivitis symptoms, or, if the eye is red without discharge, see red eye: what it could be.