Pink eye is an inflammation of the thin clear tissue that lines the inside of your eyelid and covers the white part of your eye. This tissue is called the conjunctiva, which is why the medical name for pink eye is conjunctivitis. You get pink eye when this tissue becomes irritated or infected, which causes the blood vessels in it to swell and make your eye look red or pink. The most common causes are viral infections, bacterial infections, and allergies, and each type spreads and is treated differently.
What Are the Main Types of Pink Eye?
There are three main types of pink eye, and knowing which one you have matters for treatment. Viral pink eye is the most common type in adults. It often comes with a cold or respiratory infection and produces a watery discharge. Bacterial pink eye produces a thicker, yellow-green discharge and can affect one or both eyes. Allergic pink eye happens when your eyes react to something like pollen, dust, or pet dander, and it usually affects both eyes at once.
Chemical pink eye is a fourth type, caused by irritants like smoke, chlorine, or harsh chemicals getting into the eye. This type is not contagious, but it can be painful and may require medical attention depending on the substance involved.
What Is Pink Eye And How Do You Get It?
You get pink eye through direct contact with the germs that cause it. Viral and bacterial pink eye are highly contagious and spread easily from person to person. Touching an infected person’s hand and then touching your own eye is the most common way it spreads. You can also get it by sharing towels, washcloths, pillowcases, or eye makeup with someone who has it.
Respiratory droplets from coughing or sneezing can carry the virus or bacteria to your eyes as well. This is why pink eye often spreads through households, schools, and workplaces. Allergic pink eye is different — you cannot catch it from another person. It happens when your immune system overreacts to an allergen in your environment.
What Are the Symptoms of Pink Eye?
The symptoms of pink eye vary slightly depending on the cause, but some signs are common across all types. Redness in the white of the eye is the hallmark symptom. You may also feel a gritty sensation, like something is stuck in your eye. Itching, burning, and increased tearing are also typical.
Discharge is a key clue to the type. Viral pink eye usually produces a thin, watery discharge. Bacterial pink eye often produces a thicker, pus-like discharge that can make your eyelashes stick together, especially after sleeping. Allergic pink eye typically causes intense itching and watery eyes, often along with sneezing and a runny nose.
Swelling of the eyelids and sensitivity to light can occur with any type. If you have pain, severe light sensitivity, or blurred vision that does not clear with blinking, see a doctor promptly. These symptoms can signal a more serious condition that requires medical care.
How Long Does Pink Eye Last?
Most cases of pink eye resolve on their own within one to two weeks. Viral pink eye typically lasts five to seven days but can linger for up to two weeks in some cases. Bacterial pink eye may clear faster if treated with antibiotic eye drops, usually within a few days of starting treatment, though some mild cases resolve without antibiotics.
Allergic pink eye lasts as long as you are exposed to the allergen. Once you remove the trigger or take allergy medication, symptoms usually improve within hours to days. Chemical pink eye improves once the irritating substance is flushed from the eye, which is why immediate rinsing with clean water is the first recommended step.
How Is Pink Eye Treated?
Treatment depends entirely on the cause. Viral pink eye has no specific medication that kills the virus. It runs its course, and supportive care — like using a clean, cool compress on closed eyes and artificial tears — can ease discomfort. Antibiotics do not work on viruses, so they are not prescribed for viral pink eye.
Bacterial pink eye is treated with antibiotic eye drops or ointment prescribed by a doctor. These medications fight the bacterial infection and can shorten the illness and reduce the contagious period. You should finish the entire course of antibiotics even if your eye feels better.
Allergic pink eye responds to allergy eye drops and oral antihistamines. Avoiding the allergen is the most effective approach. Over-the-counter antihistamine eye drops can relieve itching, but if symptoms are severe or persistent, see a doctor for a stronger prescription option.
For chemical pink eye, flush the eye with clean water or saline solution immediately and for at least 15 minutes. If the chemical is a strong acid or alkali, or if pain and redness persist after flushing, seek emergency medical care.
How Can You Prevent Spreading Pink Eye?
Good hygiene is the most effective way to stop pink eye from spreading. Wash your hands frequently with soap and water, especially after touching your eyes or face. Do not share towels, washcloths, pillowcases, or eye cosmetics with anyone while you have symptoms.
Throw away any eye makeup you used while infected, including mascara and eyeliner. Wash pillowcases and towels in hot water with detergent. Avoid touching or rubbing your eyes, and clean your glasses or contact lens case thoroughly. If you wear contact lenses, switch to glasses until the infection clears, and replace your contact lens case and solution.
Children with pink eye should stay home from school or daycare until they are no longer contagious. For bacterial pink eye, that is usually 24 hours after starting antibiotics. For viral pink eye, it is generally safe to return once symptoms improve, which is typically several days after onset. Check with your school or workplace for their specific policy, as rules vary.
When Should You See a Doctor?
Not every red eye needs a doctor visit, but some situations require medical attention. See a doctor if you have moderate to severe eye pain, sensitivity to light, blurred vision that does not improve with blinking, or intense redness. Also seek care if you wear contact lenses and develop red or painful eyes, as this can signal a more serious infection like keratitis.
See a doctor if your symptoms do not improve within a week, or if you have a weakened immune system from conditions like diabetes or HIV, or from medications that suppress immunity. Newborns with any eye redness or discharge should be seen by a doctor immediately, as their eyes are more vulnerable to serious infection.
Is Pink Eye Ever Serious?
Most pink eye is uncomfortable but not dangerous. However, some cases can be serious. Bacterial pink eye that is not treated can rarely lead to deeper infections of the cornea. Viral pink eye caused by herpes simplex virus requires antiviral medication and can cause corneal scarring if untreated.
Severe allergic reactions can cause significant swelling, and chemical burns can damage the cornea permanently if not flushed quickly. If you have eye pain, vision changes, or symptoms that worsen despite home care, do not delay seeking medical evaluation.
Frequently Asked Questions
Can you get pink eye from looking at someone who has it?
No. Pink eye is not spread through casual eye contact or looking at an infected person. It spreads through direct contact with infected fluids, such as touching your eye after touching an infected person’s hand or sharing contaminated items like towels or makeup.
How soon do pink eye symptoms appear after exposure?
Symptoms usually appear within 24 to 72 hours after exposure for bacterial pink eye, and within 5 to 12 days for viral pink eye. The incubation period varies depending on the specific virus or bacteria involved.
Can you go to work or school with pink eye?
It depends on the cause and your workplace or school policy. Bacterial pink eye is typically no longer contagious 24 hours after starting antibiotics. Viral pink eye is contagious while symptoms are present, so staying home until symptoms improve is generally recommended.
Does pink eye go away without treatment?
Yes, many cases do. Viral pink eye usually clears on its own within one to two weeks, and mild bacterial pink eye can also resolve without antibiotics. Allergic and chemical pink eye improve when the trigger is removed, though medical treatment may speed relief.
