Pink Eye: Causes, Treatment, and How to Stop the Spread

You wake up and one eye is red, crusty, and maybe a little swollen. Your first thought: pink eye. It is one of the most recognizable eye conditions out there, and for good reason — conjunctivitis (the medical name for pink eye) is extremely common. The Centers for Disease Control and Prevention (CDC) notes that pink eye is one of the most frequent reasons people visit a healthcare provider for eye-related complaints.

But not all pink eye is the same, and knowing the difference matters. Here is what you need to understand about the three types of conjunctivitis, how to care for it at home, when you need a prescription, and how to keep it from spreading to everyone around you.

What Is Pink Eye?

Pink eye is an inflammation of the conjunctiva — the thin, clear tissue that lines the inside of your eyelid and covers the white part of your eye. When that tissue gets irritated or infected, the tiny blood vessels inside it become more visible, which is what gives the eye its red or pink appearance. According to the National Eye Institute (NEI), pink eye can affect one or both eyes and is usually not a serious threat to your vision, though it can be quite uncomfortable.

The Three Types of Pink Eye

There are three main types of conjunctivitis, and each one has a different cause and behaves differently:

• Viral conjunctivitis is the most common form. It is caused by the same viruses that give you a cold, and it often shows up alongside an upper respiratory infection, sore throat, or runny nose. Viral pink eye typically produces a watery, clear discharge and may start in one eye before spreading to the other.
• Bacterial conjunctivitis is caused by bacteria and tends to produce a thicker, yellow-green discharge that can cause the eyelids to stick together, especially after sleep. It can affect one or both eyes and sometimes follows an ear infection in children.
• Allergic conjunctivitis is triggered by allergens like pollen, dust mites, or pet dander. Both eyes are usually affected, and the hallmark symptom is intense itching along with watery eyes, puffiness, and a runny nose. Unlike the other two types, allergic conjunctivitis is not an infection at all.

How to Tell Which Type You Have

While a healthcare provider can give you a definitive answer, there are some general clues that can help you figure out what you are dealing with:

• Discharge type matters. Watery, clear discharge usually points to viral or allergic conjunctivitis. Thick, yellow-green discharge that crusts overnight is more typical of a bacterial infection.
• Itching pattern. If your eyes itch intensely and both are affected equally, allergies are the likely culprit. Viral and bacterial pink eye can cause some irritation, but the itching is usually less prominent.
• Other symptoms. A cold or sore throat alongside pink eye suggests a viral cause. Seasonal allergy symptoms like sneezing and a stuffy nose point to allergic conjunctivitis. The American Academy of Ophthalmology (AAO) notes that the pattern of symptoms, combined with a clinical exam, helps providers determine the type and recommend the right treatment.

Is It Contagious?

This is usually the first question people ask, and the answer depends on the type:

• Viral conjunctivitis: Highly contagious. It spreads through direct contact with infected eye secretions or by touching contaminated surfaces. According to the CDC, viral pink eye can remain contagious for up to two weeks after symptoms appear.
• Bacterial conjunctivitis: Also contagious. It spreads the same way — through contact with discharge from the infected eye or with objects the infected person has touched.
• Allergic conjunctivitis: Not contagious at all. It is your immune system reacting to an allergen, not an infection, so there is no risk of passing it to someone else.

Home Care: What You Can Do Right Now

Regardless of the type, there are a few things you can do at home to ease discomfort while the condition runs its course or while you wait to see a provider:

• Cool compresses can soothe allergic conjunctivitis. Soak a clean washcloth in cool water, wring it out, and lay it gently over your closed eyes for a few minutes at a time.
• Warm compresses work better for viral and bacterial pink eye. The warmth can help loosen crusted discharge and relieve that gritty, uncomfortable feeling.
• Artificial tears (over-the-counter lubricating eye drops) can help flush irritants and keep the eye moist. Avoid drops that promise to "get the red out" — those contain vasoconstrictors that can actually make things worse with repeated use.
• Stop wearing contact lenses until the infection clears completely. Switch to glasses. The NEI recommends discarding any disposable lenses you were wearing when symptoms started, along with any contact lens solution and cases you used during that time.

When You Need Prescription Eye Drops

Home care is enough for many cases of viral and allergic pink eye. But there are situations where you need to see a provider for prescription treatment:

• Bacterial conjunctivitis typically requires antibiotic eye drops or ointment. While mild cases can sometimes clear on their own, antibiotics speed up recovery and reduce the period during which you can spread the infection to others.
• Severe allergic conjunctivitis that does not respond to over-the-counter allergy drops may need prescription-strength antihistamine or anti-inflammatory eye drops.
• Pain, light sensitivity, or blurred vision are red flags. These symptoms could indicate a more serious eye condition that needs prompt evaluation.
• Symptoms that worsen or do not improve after several days warrant a visit. A pink eye that is getting worse instead of better may need a different treatment approach.
• Newborns with eye redness or discharge need immediate medical attention. Neonatal conjunctivitis can be caused by serious bacterial infections that require urgent treatment.

How to Prevent Spreading Pink Eye

If you or someone in your household has viral or bacterial conjunctivitis, these steps can help contain it. The CDC recommends the following precautions:

• Wash your hands frequently with soap and water, especially after touching your eyes, applying eye drops, or handling anything that has been near your face.
• Do not touch or rub your eyes. This is the primary way the infection spreads from one eye to the other and to other people.
• Do not share personal items like towels, washcloths, pillowcases, eye makeup, or eye drops. If you have pink eye, use a separate towel and washcloth from the rest of your household.
• Discard eye makeup you were using when the infection started. Mascara, eyeliner, and eyeshadow can harbor bacteria and viruses.
• Clean surfaces regularly. Wipe down doorknobs, countertops, bathroom faucets, and shared electronics with a disinfectant.
• Wash pillowcases, sheets, and towels in hot water and change them frequently during the infection.

When Can Kids Go Back to School?

This is one of the most common questions parents ask. Policies vary by school district, but here are the general guidelines most healthcare providers follow:

• For bacterial conjunctivitis, children can usually return to school 24 hours after starting antibiotic eye drops, as long as symptoms are improving.
• For viral conjunctivitis, there is no antibiotic that will speed things up. Some schools require children to stay home until symptoms clear, while others allow return once discharge has stopped. Ask your school about their specific policy.
• For allergic conjunctivitis, there is no reason to keep kids home since it is not contagious.

The AAO notes that good hand hygiene and avoiding eye touching are the most effective ways to prevent outbreaks in schools and daycare settings. Teaching kids to wash their hands regularly and avoid sharing items that touch the face goes a long way.

Get It Checked — Do Not Guess

Pink eye is usually mild and resolves without complications, but self-diagnosing the type can lead to using the wrong treatment or spreading an infection unnecessarily. A quick visit to an urgent care provider can confirm what type of conjunctivitis you have, rule out anything more serious, and get you the right treatment if you need it.

At Covenant Clinic, we see pink eye regularly in patients of all ages. Our providers can evaluate your symptoms, determine the cause, and prescribe treatment on the spot — no referral or appointment needed. We are open 7 days a week, 8 AM to 8 PM, and walk-ins are always welcome.

Dealing with a red, irritated eye? Save your spot online or walk in to Covenant Clinic at 3961 E Lohman Ave, Suite 34, Las Cruces. You can also call us at 575-556-0200 with any questions.