Conjunctivitis, commonly called pink eye, is an inflammation of the thin clear tissue that lines the inside of the eyelid and covers the white part of the eye. The “cure” depends entirely on the cause — bacterial infections need antibiotics, viral infections must run their course, and allergic reactions require removing the trigger. Most cases resolve on their own or with simple home care, but knowing which type you have matters because the treatment differs completely.
What Causes Conjunctivitis and How Do You Know Which Type You Have?
Three main things cause conjunctivitis: viruses, bacteria, and allergens. A fourth type comes from irritants like smoke, chlorine, or a loose eyelash.
Viral conjunctivitis is the most common form. It often accompanies a cold or respiratory infection. The eye produces a watery discharge rather than thick pus. It typically starts in one eye and may spread to the other within a few days.
Bacterial conjunctivitis produces a thicker, yellow-green discharge that can crust over the eyelashes overnight. It often affects just one eye. This is the type that responds to antibiotic drops or ointment.
Allergic conjunctivitis affects both eyes at once. The eyes itch intensely and water profusely. It occurs seasonally or after exposure to a specific allergen like pet dander or pollen. Swelling of the eyelids is more common with allergies than with infections.
If you cannot tell which type you have, look at the discharge. Watery eyes suggest viral or allergic. Thick and sticky suggests bacterial. When in doubt, see a doctor — eye pain, light sensitivity, or blurred vision are signs you need prompt medical attention regardless of the type.
How To Cure Eye Conjunctivitis: What Actually Works for Each Type
There is no single cure for all conjunctivitis. The effective treatment matches the underlying cause.
Viral conjunctivitis has no specific antiviral treatment for the common forms. Antibiotics do not help. The infection typically clears on its own in 7 to 14 days. Treatment focuses on symptom relief: cool compresses, artificial tears, and gentle cleaning of the eye with a warm wet cloth.
Bacterial conjunctivitis usually requires prescription antibiotic eye drops or ointment. Common options include erythromycin, polymyxin/trimethoprim, or fluoroquinolone drops. With antibiotics, symptoms often improve within 24 to 48 hours. Finish the entire course even if your eye feels better — stopping early can allow the bacteria to return or develop resistance.
Allergic conjunctivitis responds best to avoiding the trigger. Antihistamine eye drops, available over the counter or by prescription, reduce itching. Cold compresses also help. Oral antihistamines can help but may dry the eyes, which sometimes worsens discomfort.
Irritant conjunctivitis resolves once the irritant is removed. Flush the eye with sterile saline or artificial tears. If the irritant is a chemical, flush with water for at least 15 minutes and seek medical care — some chemicals can damage the cornea.
Home Remedies That Actually Help — and One That Does Not
Several home measures genuinely reduce discomfort while your immune system clears the infection.
Cool compresses applied for 5 to 10 minutes several times daily soothe inflammation and reduce swelling. Use a clean cloth each time to avoid reintroducing bacteria.
Artificial tears, which are preservative-free single-use vials, lubricate the eye and wash out irritants. They do not treat the infection but they make the eye feel significantly better.
Warm compresses help specifically with bacterial conjunctivitis by loosening crusted discharge. Gently wipe from the inner corner of the eye outward with a clean cloth. Never reuse the same cloth on the other eye.
One popular remedy does not work: breast milk. Some people apply breast milk to a pink eye based on anecdotal claims. No clinical evidence supports this practice. Breast milk is not sterile and may introduce additional bacteria or irritants to an already inflamed eye. Do not put breast milk in the eye.
How Long Is Pink Eye Contagious and When Can You Return to Work or School?
Viral conjunctivitis is contagious from the time symptoms appear until the eye stops producing discharge. This can last 7 to 14 days. Bacterial conjunctivitis is contagious until 24 hours after starting antibiotics. Without antibiotics, bacterial conjunctivitis may remain contagious for up to two weeks.
Most schools and workplaces require a doctor’s note or 24 hours of antibiotic treatment before returning. For viral conjunctivitis, you can return when symptoms improve and discharge decreases, which usually takes 3 to 5 days.
Allergic and irritant conjunctivitis are not contagious at all. You cannot spread them to anyone.
During the contagious period, wash your hands frequently, avoid touching your eyes, and do not share towels, pillows, or makeup. Replace any eye makeup you used while infected — the bacteria or virus can live in the product and reinfect you later.
When Should You See a Doctor for Pink Eye?
Not every pink eye needs a doctor visit. But some symptoms demand prompt medical evaluation.
See a doctor if you experience any of the following:
- Moderate to severe eye pain
- Blurred vision that does not clear with blinking
- Sensitivity to light
- Intense redness in the eye
- Symptoms that worsen or do not improve within 48 hours
- A weakened immune system from conditions like HIV, diabetes, or chemotherapy
- You wear contact lenses — contact lens wearers with pink eye need immediate evaluation because of the risk of corneal infection
Newborns with any eye discharge need urgent medical evaluation. This can be a sign of a serious infection that requires immediate treatment.
If you wear contact lenses, remove them at the first sign of pink eye and do not wear them again until the eye is completely healed and your doctor confirms it is safe. Wearing contacts during an active infection can damage the cornea.
How To Prevent Spreading Conjunctivitis to Others
Good hygiene is the most effective prevention. The virus or bacteria spreads through contact with infected eye discharge.
Wash your hands frequently with soap and water, especially after touching your face or eyes. Use hand sanitizer when soap is not available.
Avoid touching or rubbing your eyes. If you must touch them, wash your hands immediately before and after.
Do not share personal items during an active infection. This includes towels, washcloths, pillowcases, eye drops, and cosmetics. Replace or thoroughly clean any of these items after the infection resolves.
Disinfect frequently touched surfaces like doorknobs, faucets, and countertops. The virus can survive on surfaces for several days.
Stay home from work or school while you have active discharge. This is not just considerate — it prevents the spread to coworkers, classmates, and family members.
Can You Prevent Conjunctivitis Before It Starts?
Prevention depends on the cause. You cannot fully prevent viral conjunctivitis because it often arrives with a common cold. But you can reduce your risk.
Do not share eye makeup, especially mascara and eyeliner. Replace eye makeup every three months. Never use store testers on your eyes.
Wash your hands before inserting or removing contact lenses. Clean and store lenses exactly as your eye care professional instructs. Never sleep in lenses not designed for overnight wear.
If you have seasonal allergies, start antihistamine eye drops before allergy season begins. This can reduce the severity of allergic conjunctivitis when pollen counts rise.
For people who get recurrent bacterial conjunctivitis, some clinicians recommend replacing all eye makeup and contact lens supplies. The bacteria can live in these products and reinfect you repeatedly.
What Happens If You Leave Conjunctivitis Untreated?
Most viral conjunctivitis resolves completely without treatment and leaves no lasting damage. The eye returns to normal once the infection clears.
Untreated bacterial conjunctivitis can sometimes resolve on its own, but it may also spread to deeper structures of the eye. This is rare but serious. Corneal ulcers, keratitis, and even vision loss can occur in severe cases. This is why bacterial conjunctivitis should be treated with antibiotics when diagnosed.
Untreated allergic conjunctivitis does not damage the eye, but chronic rubbing from itching can cause corneal problems over time. The cornea is delicate, and repeated friction can cause a condition called keratoconus, where the cornea thins and bulges.
The main risk of untreated conjunctivitis is not the eye itself — it is transmission. An untreated bacterial or viral infection can spread to family members, coworkers, and anyone who touches contaminated surfaces.
Frequently Asked Questions
Can pink eye go away on its own without treatment?
Yes, viral conjunctivitis and mild bacterial conjunctivitis can clear on their own within one to two weeks. Antibiotics are only needed for bacterial infections, and they shorten the duration and reduce transmission risk.
How do I know if my pink eye is viral or bacterial?
Viral pink eye produces watery discharge and often starts with a cold, while bacterial pink eye produces thick yellow-green discharge that crusts overnight. If you are unsure, see a doctor for an accurate diagnosis.
How fast do antibiotic eye drops work for pink eye?
Antibiotic eye drops typically improve symptoms within 24 to 48 hours. The eye may still look red for several days, but pain and discharge should decrease quickly.
Can I go to work with pink eye?
Not if you have active discharge from a viral or bacterial infection. You can return 24 hours after starting antibiotics for bacterial conjunctivitis, or when discharge stops for viral conjunctivitis. Allergic and irritant conjunctivitis are not contagious.
