Viral conjunctivitis is an infection of the clear membrane covering the white of your eye and the inside of your eyelids. It’s the most common cause of pink eye, and most cases clear up on their own within 7 to 14 days without treatment. The infection is highly contagious, spreading easily through direct contact with infected tears or by touching contaminated surfaces and then touching your eyes.
What Causes It
Adenoviruses are responsible for the majority of viral conjunctivitis cases. These are the same family of viruses behind many upper respiratory infections, which is why pink eye often shows up alongside a cold or sore throat. You might notice that your eyes become red and irritated right as you’re getting over a respiratory illness, or at the same time other symptoms appear, like fatigue, mild fever, or swollen lymph nodes.
Other viruses can also trigger it, including herpes simplex, varicella-zoster (the virus behind chickenpox and shingles), and enterovirus. But adenoviral infections account for the bulk of outbreaks, especially in schools, daycare centers, and healthcare settings where close contact is common.
How It Feels
Viral conjunctivitis typically starts suddenly in one eye and spreads to the other within a day or two. The hallmark symptoms include:
- Watery, teary discharge that is thin and clear, not thick or goopy
- Redness across the white of the eye
- Foreign body sensation, like something gritty is stuck in your eye
- Light sensitivity
- Burning or itching
One physical clue that points toward a viral cause is a swollen, tender lymph node just in front of your ear on the affected side. If you press gently in that area and feel a small, sore bump, that’s a strong indicator the infection is viral rather than bacterial or allergic. You may also notice small bumps (follicles) on the inside of your lower eyelid if you pull it down gently, though this isn’t something you need to check yourself.
Viral vs. Bacterial vs. Allergic Pink Eye
The type of discharge is the quickest way to tell these apart. Viral conjunctivitis produces watery, clear discharge. Bacterial conjunctivitis causes thick, yellow-green pus that can crust your eyelids shut overnight. Allergic conjunctivitis produces watery eyes too, but intense itching is the dominant symptom, and both eyes are almost always affected equally from the start. Allergic cases also tend to come with other allergy symptoms like sneezing or a runny nose, and they aren’t contagious.
Constitutional symptoms help with the distinction as well. Fever, fatigue, sore throat, and swollen lymph nodes suggest a viral infection. Bacterial pink eye is more localized, affecting the eye without making you feel generally unwell. These patterns overlap, though, and even clinicians sometimes have difficulty distinguishing between types on appearance alone.
How Long It Lasts
Most mild cases resolve in 7 to 14 days without any medication. Symptoms often peak around days 3 to 5, when redness and discharge are at their worst, then gradually improve. In some cases, particularly those caused by certain adenovirus strains, the infection can take 2 to 3 weeks or longer to fully clear.
You remain contagious for as long as your eyes are red and producing discharge. This means you could be spreading the virus for the full duration of symptoms. Children are generally kept home from school and adults from work until discharge has stopped, since the virus transmits so easily through shared surfaces and hand-to-eye contact.
Treatment and Symptom Relief
There is no antiviral medication for the common adenoviral form of conjunctivitis. Antibiotics do not work against viruses and are not recommended. Treatment focuses on comfort while the infection runs its course.
Cool compresses applied to closed eyes for 5 to 10 minutes several times a day can reduce swelling and soothe irritation. Preservative-free artificial tears help wash away discharge and relieve the gritty feeling. If you wear contact lenses, stop using them until the infection has completely cleared and your eyes feel normal again. Throw away any disposable lenses and lens cases you used while infected, and clean extended-wear lenses thoroughly before wearing them again.
Avoid rubbing your eyes, even though the itching and irritation make it tempting. Rubbing can worsen inflammation, introduce bacteria that cause a secondary infection, and spread the virus to your other eye or to surfaces around you.
Preventing Spread
Viral conjunctivitis spreads through direct contact with infected secretions or contaminated objects. The virus can survive on surfaces like doorknobs, countertops, and shared towels, making hand hygiene the single most important prevention measure.
Wash your hands with soap and water for at least 20 seconds before and after touching your face, applying eye drops, or cleaning discharge from your eyes. Use a fresh cotton ball or clean washcloth each time you wipe your eyes, and launder washcloths and towels in hot water. Don’t share pillows, towels, eye drops, makeup, or eyeglasses with anyone. Avoid swimming pools while you have symptoms.
If you’re caring for someone with pink eye, wash your hands immediately after any contact with them or their belongings. Don’t touch your own eyes with unwashed hands.
Possible Complications
Most viral conjunctivitis heals without any lasting effects. But a more severe form called epidemic keratoconjunctivitis (EKC), caused by specific adenovirus strains, can involve the cornea and potentially affect vision.
Corneal involvement can begin as early as the fourth day of infection. It starts with tiny spots on the surface of the cornea that may enlarge over time. After the acute infection resolves, these spots can persist as hazy lesions that scatter light and cause blurred vision, glare, and continued light sensitivity. In most people, these lesions fade within a few weeks. In rare cases, they can linger for months or even years.
Some people also experience persistent eye dryness after the infection clears, which may require ongoing use of artificial tears. This is more common with severe or prolonged infections.
Signs That Need Prompt Attention
Typical viral conjunctivitis is uncomfortable but not dangerous. Certain symptoms, however, suggest something more serious is happening and call for a prompt eye exam. These include moderate to severe eye pain (not just irritation), significant sensitivity to light, noticeably decreased vision, or symptoms that worsen after the first week instead of improving. A white spot visible on the colored part of your eye, intense redness concentrated in a ring around the iris, or pain that doesn’t respond to cool compresses also warrant evaluation. These can indicate corneal involvement, a secondary bacterial infection, or a different condition entirely that mimics pink eye.