Conjunctivitis: Symptoms, Treatment, and Prevention

Conjunctivitis: Symptoms, Causes, Treatment, and How to Prevent It

Conjunctivitis, commonly known as pink eye, is one of the most common eye conditions affecting both children and adults. Although it is usually not serious, it can cause significant discomfort and, depending on its cause, may spread easily from person to person.

Conjunctivitis occurs when the conjunctiva—the thin, transparent membrane that covers the white part of the eye and the inside of the eyelids—becomes inflamed or infected. This inflammation causes the tiny blood vessels within the conjunctiva to become more visible, resulting in redness, irritation, tearing, and discharge.

Because conjunctivitis can have different causes, obtaining an accurate diagnosis is essential for receiving the appropriate treatment, relieving symptoms, preventing complications, and reducing the risk of transmission.

At BlueNetHospitals Los Cabos, our Ophthalmology specialists provide comprehensive eye evaluations using advanced diagnostic technology to determine the cause of conjunctivitis and recommend the most effective treatment for your eye health.

What Is Conjunctivitis?

Conjunctivitis is the inflammation of the conjunctiva, the clear membrane that protects the eye and helps keep its surface moist and lubricated.

It may affect one or both eyes and can develop suddenly (acute) or persist over time (chronic), depending on the underlying cause.

While most cases are mild, some require prompt medical attention to prevent complications, particularly if vision changes, severe pain, or corneal involvement are present.

What Causes Conjunctivitis?

Conjunctivitis can develop for several reasons, and identifying the cause is essential because treatment varies depending on the underlying condition.

Viral Conjunctivitis

Viral conjunctivitis is the most common type of infectious conjunctivitis.

It is most often caused by adenoviruses, which are also responsible for many respiratory infections. Less commonly, viruses such as herpes simplex virus (HSV) and varicella-zoster virus (VZV) can also affect the eye.

Viral conjunctivitis is highly contagious and spreads easily in schools, daycare centers, workplaces, and households through direct contact with infected secretions or contaminated surfaces.

Bacterial Conjunctivitis

Bacterial conjunctivitis is caused by bacteria that infect the surface of the eye.

It commonly produces a thick yellow or green discharge that may cause the eyelids to stick together, especially after sleeping.

Treatment usually involves antibiotic eye drops or ointments, allowing symptoms to improve within a few days.

Allergic Conjunctivitis

Unlike infectious conjunctivitis, allergic conjunctivitis is not contagious.

It develops when the eyes react to allergens such as:

• Pollen
• Dust
• Dust mites
• Pet dander
• Mold

Symptoms often affect both eyes and include intense itching, tearing, and redness.

Irritant Conjunctivitis

Eye irritation may also occur after exposure to:

• Smoke
• Swimming pool chlorine
• Chemicals
• Air pollution
• Foreign objects
• Improper use of contact lenses

Symptoms usually improve once the irritant has been removed.

Symptoms of Conjunctivitis

Symptoms vary depending on the cause but commonly include:

• Red eyes
• Eye irritation
• Itching
• Burning sensation
• Excessive tearing
• Swollen eyelids
• Sensitivity to light
• Clear or thick eye discharge
• Eyelids sticking together upon waking
• A gritty sensation, as if something is in the eye

If symptoms include severe pain, blurred vision, or significant light sensitivity, immediate evaluation by an ophthalmologist is recommended.

How Is Conjunctivitis Diagnosed?

In most cases, an Ophthalmologist can diagnose conjunctivitis through a comprehensive eye examination and a review of your symptoms and medical history.

Your specialist may ask about:

• Recent respiratory infections
• Allergies
• Contact with someone who has pink eye
• Contact lens use
• Previous eye conditions

In severe, recurrent, or treatment-resistant cases, laboratory testing of eye discharge may be recommended to identify the responsible microorganism.

Treatment for Conjunctivitis

Treatment depends entirely on the cause of the inflammation.

Viral Conjunctivitis

Most cases resolve on their own within one to two weeks.

Treatment focuses on relieving symptoms and may include:

• Artificial tears
• Cold compresses
• Good eye hygiene

When caused by herpes viruses, antiviral medications may be necessary.

Bacterial Conjunctivitis

Treatment typically includes:

• Antibiotic eye drops
• Antibiotic eye ointments

Most patients experience noticeable improvement within a few days after starting treatment.

Allergic Conjunctivitis

Treatment focuses on reducing exposure to allergens and controlling inflammation through:

• Artificial tears
• Antihistamine medications
• Anti-inflammatory eye drops prescribed by your ophthalmologist

How Can You Prevent the Spread of Conjunctivitis?

Viral and bacterial conjunctivitis spread easily through direct contact with infected secretions.

To reduce the risk of infection:

• Wash your hands frequently.
• Avoid touching or rubbing your eyes.
• Do not share towels, pillows, or washcloths.
• Change pillowcases regularly.
• Avoid sharing eye makeup.
• Stop wearing contact lenses until your doctor approves their use again.
• Discard eye makeup used during the infection.
• Clean and disinfect frequently touched surfaces.

These simple hygiene measures help prevent transmission to family members, coworkers, classmates, and others.

Can I Go to Work or School with Conjunctivitis?

It depends on the type of conjunctivitis.

When the infection is viral or bacterial, it is usually recommended to stay home during the most contagious period to reduce transmission.

If attendance is necessary, strict hand hygiene and compliance with your physician's treatment recommendations are essential.

When Should I See an Ophthalmologist?

Seek prompt medical attention if you experience:

• Severe eye pain
• Blurred or decreased vision
• Significant sensitivity to light
• Heavy eye discharge
• Severe eyelid swelling
• Symptoms that worsen or fail to improve
• Recurrent episodes of conjunctivitis

Early diagnosis allows for appropriate treatment and helps protect your vision.

Can Conjunctivitis Affect Your Vision?

Most cases of conjunctivitis do not cause permanent vision loss.

However, certain infections—particularly those caused by herpes viruses or severe bacterial infections—can involve the cornea and potentially affect vision if left untreated.

For this reason, you should never self-medicate with prescription eye drops without first being evaluated by an ophthalmologist.

Schedule an Appointment with an Ophthalmology Specialist

At BlueNetHospitals Los Cabos, our experienced Ophthalmology specialists diagnose and treat conjunctivitis and a wide range of eye conditions using advanced diagnostic technology and evidence-based care.

If you are experiencing red eyes, irritation, excessive tearing, eye discharge, or changes in your vision, schedule a comprehensive eye evaluation with one of our specialists.

📲 Schedule your appointment today by WhatsApp at +52 (624) 151 0693.

🚑 If you experience severe eye pain, sudden vision loss, eye trauma, heavy discharge accompanied by fever, or extreme sensitivity to light, seek emergency medical care immediately or call our ambulance service at +52 (624) 104 3911.

Frequently Asked Questions
1. Is conjunctivitis contagious?

Yes. Viral and bacterial conjunctivitis are contagious and can spread easily through direct contact with infected secretions or contaminated objects. Allergic and irritant conjunctivitis are not contagious.

2. How long does conjunctivitis last?

The duration depends on the cause. Viral conjunctivitis usually resolves within one to two weeks, while bacterial conjunctivitis often improves within a few days after starting antibiotic treatment.

3. Can I wear contact lenses if I have conjunctivitis?

No. You should stop wearing contact lenses until your ophthalmologist confirms that the infection has completely resolved.

4. Can conjunctivitis go away on its own?

Some cases, especially viral conjunctivitis, may resolve without specific treatment. However, a medical evaluation is recommended to determine the cause and ensure appropriate management.

5. How can I tell if conjunctivitis is viral or bacterial?

Although both types can cause red eyes, bacterial conjunctivitis typically produces a thick yellow or green discharge, while viral conjunctivitis usually causes watery discharge and excessive tearing. An ophthalmologist can determine the exact cause through an eye examination.

6. When should I see an ophthalmologist for conjunctivitis?

You should seek medical care if you experience severe eye pain, blurred vision, significant light sensitivity, heavy discharge, worsening symptoms, or recurrent episodes of conjunctivitis. Early treatment helps prevent complications and protects your vision.