Pink eye, known medically as conjunctivitis, causes redness, discharge, and irritation when the thin transparent membrane covering the white of your eye becomes inflamed. The specific symptoms you experience depend on whether the cause is viral, bacterial, allergic, or an irritant. Most cases improve within a few days to two weeks.
General Symptoms Across All Types
Regardless of the cause, pink eye shares a core set of symptoms. You’ll notice a pink or red color in the white of one or both eyes, caused by tiny blood vessels in the eye’s surface layer dilating as part of an inflammatory response. Your body sends immune cells and fluid to the area, which is why the eye looks red and feels swollen.
Beyond the redness, common symptoms include:
- Swelling of the eyelids or the membrane lining the white of the eye
- Eye discharge that may be clear, yellow, white, or green
- Crusting of the eyelids or lashes, particularly in the morning
- Watery, teary eyes
- Itching, irritation, or burning
- A gritty feeling, like something is stuck in your eye
- Sensitivity to light
- Contact lenses that feel uncomfortable or won’t stay in place
The crusting deserves special mention because it catches many people off guard. Discharge accumulates overnight and dries along your lash line, sometimes sealing your eyelids shut by morning. A warm, damp washcloth held gently over the eye for a minute or two will soften the crust so you can open your eyes without pulling at your lashes.
How Symptoms Differ by Type
Viral Pink Eye
Viral conjunctivitis is the most common form and is typically linked to the same viruses that cause the common cold. The hallmark is a watery, thin discharge rather than thick pus. Your eyes will feel sandy and gritty, and you may have moderate to severe light sensitivity. Pain is more common with viral pink eye than with other types. It often starts in one eye and spreads to the other within a day or two. You may also have cold symptoms like a runny nose, sore throat, or cough at the same time.
Viral pink eye is highly contagious. It generally remains contagious as long as your eyes are tearing and producing discharge, which can last up to two weeks.
Bacterial Pink Eye
Bacterial conjunctivitis produces a thick, yellow or green discharge that can be dramatic in volume. This is the type most likely to glue your eyelids together overnight. Despite the alarming appearance, bacterial pink eye typically causes minimal pain. The redness tends to be moderate, and the discharge is the most distinguishing feature. It can also make the eyelids visibly red and swollen, with crust attaching to the lashes.
Bacterial pink eye is also contagious and spreads through direct contact with the discharge or contaminated surfaces like towels and pillowcases.
Allergic Pink Eye
Allergic conjunctivitis almost always affects both eyes at the same time, which is one of the easiest ways to distinguish it from viral or bacterial forms. The defining symptom is intense itching, often more severe than what you’d feel with an infection. Discharge is typically clear and watery, and the eyes may look puffy and swollen. It occurs more frequently in people who already have seasonal allergies, and you’ll often have other allergy symptoms like sneezing or a runny nose alongside it. Allergic pink eye is not contagious.
Irritant Pink Eye
Exposure to chemicals, chlorine, smoke, or a foreign object can inflame the conjunctiva without any infection. Symptoms include watery eyes and sometimes a mucus discharge. This type also is not contagious and usually resolves once the irritant is removed or flushed from the eye.
Quick Comparison by Discharge Type
Because many people search specifically to figure out which type they have, the discharge is your best clue:
- Thin and watery: likely viral or allergic
- Thick yellow or green pus: likely bacterial
- Clear and watery with intense itching: likely allergic
- Watery with mucus after chemical exposure: likely irritant
If both eyes are affected simultaneously with significant itching, allergies are the most probable cause. If it started in one eye and spread to the other, a viral infection is more likely.
Symptoms in Children
Children experience the same core symptoms as adults: redness, discharge, crusting, and irritation. Young kids may rub their eyes frequently and complain that something feels stuck in them. The morning crusting can be especially distressing for children who wake up unable to open their eyes.
Pink eye spreads quickly in schools and daycares because children touch their faces often and share objects. If your child has tearing and matted eyes, they’re still contagious and can pass it to classmates through direct contact.
Pink Eye in Newborns
Newborns can develop pink eye within the first few weeks of life, and it requires prompt attention because their immune systems are still developing. Symptoms include puffy, red, tender eyelids and drainage from the eyes. The timeline of when symptoms appear can help identify the cause.
A mild reaction to antibiotic eye drops given at birth can cause slight redness and eyelid swelling that lasts only 24 to 36 hours. Bacterial infections picked up during delivery typically appear within the first 2 to 5 days of life and cause thick pus along with red, swollen eyes. Another type of bacterial infection produces similar symptoms but tends to appear 5 to 12 days after birth. Any eye discharge or redness in a newborn warrants medical evaluation, as untreated bacterial conjunctivitis in infants can lead to serious complications.
Signs That Need Prompt Attention
Most pink eye is uncomfortable but not dangerous. However, certain symptoms suggest something more serious is going on. Significant eye pain (beyond the mild gritty sensation), blurred vision that doesn’t clear when you blink away discharge, intense light sensitivity, or symptoms that worsen after several days instead of improving all warrant a closer look from a healthcare provider. The same applies if you wear contact lenses and develop pink eye symptoms, as contact lens wearers face a higher risk of corneal infections that can mimic or complicate conjunctivitis.