Pink eye, or conjunctivitis, shows up as redness in the white of your eye, some form of discharge, and a gritty or irritated feeling. If your eye looks noticeably red or pink and you’re producing more tears or discharge than normal, you likely have some form of conjunctivitis. But the type of discharge, the level of discomfort, and whether one or both eyes are affected can tell you a lot about what’s causing it and how serious it is.
The Core Signs of Pink Eye
All types of pink eye share a few hallmark symptoms: visible redness across the white of the eye, a feeling of grittiness or irritation (like something is stuck in your eye), and increased tearing or discharge. Your eyelids may look puffy, and you might notice crusting along your lash line, especially after sleeping.
What separates pink eye from a passing moment of eye irritation is persistence. A red eye from rubbing it or getting dust in it clears up within minutes to an hour. Pink eye sticks around, and the redness tends to look even and spread across the eye rather than concentrated in one spot. The discharge keeps coming back after you wipe it away.
How to Tell Which Type You Have
There are three main types of pink eye, and the discharge is the biggest clue to which one you’re dealing with.
Viral pink eye produces a watery, thin discharge, similar to tears. It often starts in one eye and spreads to the other within a day or two. You may have mild itching, and the redness tends to be diffuse across the surface of the eye. Viral pink eye frequently shows up alongside a cold, sore throat, or upper respiratory infection. If you’ve been sick or around someone who was, this is the most likely culprit.
Bacterial pink eye is the one that produces thick, yellow or greenish pus. This is the type that glues your eyelids shut overnight. You’ll wake up and have to peel your lashes apart or soak the crust off with a warm washcloth. Both eyes are commonly affected, and the discharge keeps pooling throughout the day. There’s usually no itching, but the eyes feel heavy and uncomfortable.
Allergic pink eye is driven by itching more than anything else. The itching can be intense, and both eyes are almost always involved at the same time. Discharge is watery and teary rather than thick. Your eyelids may be noticeably swollen and irritated. Allergic conjunctivitis tends to come with other allergy symptoms like sneezing or a runny nose, and it flares up during specific seasons or after exposure to pet dander, dust, or pollen. Unlike viral and bacterial forms, it is not contagious.
Signs That It’s Not Pink Eye
Several eye conditions look like pink eye at first glance but are more serious. Knowing the difference matters because these conditions can damage your vision if left untreated.
Pain is the most important dividing line. Pink eye is irritating and uncomfortable, but it doesn’t cause deep, aching pain. If your eye hurts in a way that feels like pressure behind or inside the eye, or if the pain gets worse when you move your eye, that points toward conditions like inflammation inside the eye (uveitis), a deeper infection, or even a sudden spike in eye pressure (acute glaucoma). These need prompt medical attention.
Sensitivity to light is another red flag. Mild light sensitivity can happen with pink eye, but if looking at normal indoor lighting causes real pain or makes you squint, that suggests the problem is deeper than the surface of the eye.
Vision changes separate pink eye from something more concerning. Pink eye can make your vision slightly blurry because of discharge coating the surface, but wiping your eye should clear it up. If your vision stays blurry after clearing the discharge, or if you notice a sudden decrease in how well you can see, that’s not typical of conjunctivitis.
A few other warning signs to watch for: severe headache or nausea alongside a red eye, a hazy or cloudy-looking cornea, pain that radiates from the eye into your head, or a pupil that looks abnormally large or doesn’t react to light. Any combination of these warrants same-day evaluation.
How Long It Lasts and When You’re Contagious
Viral pink eye typically runs its course in 7 to 14 days without treatment. It tends to be worst around days three through five, then gradually improves. You remain contagious as long as your eyes are tearing and producing discharge. Frequent handwashing, using your own towels, and avoiding touching your face are the main ways to keep it from spreading.
Bacterial pink eye can improve on its own in mild cases, but antibiotic eye drops shorten the illness and reduce how long you’re contagious. With treatment, most people see significant improvement within 24 to 48 hours. Without it, bacterial conjunctivitis can linger for up to 10 days. You’re considered contagious as long as discharge is present and your eyelids are matting together.
Allergic pink eye isn’t contagious at all, and it lasts as long as you’re exposed to the allergen triggering it. Removing the trigger or using allergy eye drops typically brings relief within hours.
What to Do Right Now
If you’re trying to figure out whether you have pink eye, start by looking at your discharge. Thick, colored pus points to bacterial. Watery and tear-like suggests viral or allergic. Intense itching with both eyes involved and no cold symptoms leans toward allergies.
A cool, damp washcloth held gently against your closed eyelid can relieve irritation for any type. Avoid wearing contact lenses until the redness and discharge are completely gone, and don’t share pillowcases, towels, or eye makeup. If you wear eye makeup, throw out anything you used while symptomatic, since it can harbor bacteria or virus particles.
For bacterial pink eye with heavy discharge, or for any pink eye that doesn’t start improving within a few days, a visit to your doctor or an urgent care clinic can confirm the diagnosis. They’ll examine the pattern of redness, the type of discharge, and whether your vision and pupils are normal. In most cases, no lab tests are needed. The exam itself is enough to determine what you’re dealing with and whether you need treatment.