Conjunctivitis Symptoms: Signs, Causes & Warning Symptoms

Quick Glance: Common Conjunctivitis Symptoms

Common symptoms of conjunctivitis are given below:

Red or pink appearance of the white part of the eye
Watery or teary eyes
Itching, particularly with allergic conjunctivitis
A burning, gritty or irritated feeling
Sticky or watery discharge from the eye
Swollen or puffy eyelids
Eyelids sticking together, especially after sleeping
An urge to rub the affected eye

The symptoms can first appear in one eye and later affect the other, particularly with infectious conjunctivitis.

Symptoms of Conjunctivitis That Should Not Be Ignored

Most cases of conjunctivitis, or pink eye, are mild, but some symptoms require prompt medical evaluation because they indicate a serious eye condition or a severe infection. These include:

Symptom	What It May Indicate
Eye redness that does not improve or keeps worsening	The symptoms may indicate a condition other than uncomplicated conjunctivitis.
Persistent or increasing eye discharge	Possible bacterial infection or another eye condition.
Symptoms repeatedly returning	Allergy, chronic conjunctivitis or another underlying eye condition
Red eye with persistent reduction in vision	Corneal involvement or another eye disorder rather than uncomplicated conjunctivitis
Noticeable swelling of the eyelids that persists	Ongoing inflammation or infection
Significant sensitivity to light	Possible corneal or deeper eye involvement
Red, swollen or pus-filled eyes in a newborn	Neonatal conjunctivitis, which can sometimes be serious

Why Do Conjunctivitis Symptoms Occur?

Conjunctivitis symptoms occur when the conjunctiva, a thin membrane that covers the white of the eye and lines the inside of the eyelids, becomes inflamed. The inflammation causes the small blood vessels in the conjunctiva to dilate and makes the eye look pink or red.

Infectious conjunctivitis may be caused by viruses or bacteria. The immune response to these organisms causes redness, swelling, watering and discharge. Viral conjunctivitis may produce a watery discharge and can occur together with the symptoms of a cold or sore throat, while bacterial conjunctivitis produces a more mucus-like or pus-like discharge.

Allergic conjunctivitis occurs when the immune system responds to an allergen such as pollen or dust. This response may release substances such as histamine and cause intense itching, watering, redness, and swelling of the eyelids. Allergic conjunctivitis can affect both eyes.

Symptoms of Conjunctivitis That Require Immediate Medical Attention

Urgent medical attention is recommended if you notice the following symptoms:

Severe eye pain
Sudden or persistent changes in vision
Reduction of vision
Significant sensitivity or pain when looking at light
A very painful and intensely red eye
A red eye accompanied by a severe headache and nausea or vomiting
Confusion or loss of consciousness
Rapidly increasing swelling around the eye
Difficulty opening or moving the eye because of pain or swelling

These symptoms may indicate a problem other than conjunctivitis and should not be managed by self-diagnosis. A red eye in a contact lens wearer also needs prompt assessment because contact lenses increase the risk of bacterial keratitis, which can damage the cornea.

Chemical exposure, a penetrating eye injury or a foreign object embedded in the eye also requires emergency assessment.

Symptoms of Conjunctivitis Based on Type

Symptoms of conjunctivitis or pink eye, based on type, are listed in the table below:

Type of Conjunctivitis	Symptoms
Viral Conjunctivitis	Red or pink eye, watery discharge, burning or gritty sensation; may start in one eye and spread to the other and may occur with a cold or sore throat
Bacterial Conjunctivitis	Red or pink eye with mucus or pus-like discharge, eyelids sticking together after sleep, irritation and eyelid swelling
Allergic Conjunctivitis	Prominent itching, watering, redness and puffy eyelids, usually affecting both eyes and often occurring with other allergy symptoms

Symptoms of Conjunctivitis in Children

Children usually develop the same symptoms of conjunctivitis as adults, including:

Red or pink eyes
Watery eyes
Sticky or mucus-like discharge
Eyelids sticking together after sleep
Itching or frequent eye rubbing
Puffy eyelids
Burning, irritation or a gritty sensation

Viral conjunctivitis in children may occur with symptoms of a respiratory infection, such as a runny nose, cough or sore throat.

Young children may not describe pain, blurred vision or light sensitivity clearly. Parents should seek prompt assessment if a child avoids light, keeps the eye closed, develops significant eye pain or has an obvious change in vision.

Newborns need special attention. A baby with conjunctivitis symptoms during the first weeks of life should be assessed promptly. Neonatal conjunctivitis can result from infection, irritation or a blocked tear duct, and infectious forms can occasionally cause severe eye damage or systemic infection.

Can You Have Conjunctivitis Without Symptoms?

Conjunctivitis causes some symptoms because inflammation of the conjunctiva results in redness, watering, irritation or discharge. The severity varies from person to person. Some people notice mild inflammation and slight discomfort, while others notice severe redness and discharge.

Mild symptoms do not confirm that the condition is conjunctivitis or pink eye, because dry eye, allergy, eyelid problems and several other conditions can cause a similar appearance. A healthcare professional can evaluate any persistent or unusual symptoms and decide on further investigation.

When Can Conjunctivitis Symptoms Become Life-Threatening?

Uncomplicated conjunctivitis is not life-threatening. Most serious red-eye emergencies are either vision-threatening eye conditions or infections occurring outside ordinary conjunctivitis.

The emergency-causing symptoms and why they can be serious are described in the table below:

Symptoms	Why It Is Serious
Severe eye or eyelid swelling with fever, marked pain and pain or difficulty moving the eye	These symptoms may indicate orbital cellulitis, a serious infection that can spread beyond the eye socket.
Red, swollen eyes with heavy pus-like discharge in a newborn	Gonococcal or another neonatal infection can damage the cornea and, rarely, spread through the bloodstream or cause meningitis.
High fever, marked lethargy or rapidly worsening illness with severe eye swelling	These systemic symptoms may indicate a serious spreading infection requiring emergency treatment.
Confusion, reduced consciousness or severe systemic illness occurring with an eye infection	These are not typical conjunctivitis symptoms and may indicate a severe infection affecting the whole body.

How are Conjunctivitis Symptoms Diagnosed?

A doctor can examine the eye and review the person's symptoms and medical history to diagnose conjunctivitis. Further testing may be required if the symptoms are severe, unusual, or do not improve.

Depending on the symptoms and examination findings, a healthcare professional may use the following assessments or tests:

Diagnostic Test or Assessment	Purpose
Medical and symptom history	Reviews onset, discharge, itching, recent infections, allergies, contact-lens use and exposure to other people with conjunctivitis
Eye examination	Checks swelling, redness, discharge and the condition of the eye surface.
Medical history	Can identify recent infections, allergies, contact lens use and possible exposure to infected people.
Visual acuity test	Assess whether vision has been affected because of the pink eye.
Slit-lamp examination	Provides a magnified view of the eye and helps to assess the cornea and conjunctiva.
Fluorescein staining	Can identify damage or abnormalities on the corneal surface.
Eye swab or culture	May be used when infection is unusual, discharge is severe, or symptoms do not respond as expected.
Targeted laboratory testing (if required)	Helps to identify a viral cause when the diagnosis is unclear.

Frequently Asked Questions (FAQs)

Q1. What is the first symptom of conjunctivitis?

Ans: The first symptoms of conjunctivitis are redness of the white part of the eye, irritation, watering, itching or discharge. These symptoms may occur together or develop slowly.
Q2. Can conjunctivitis develop without symptoms?

Ans: Conjunctivitis may cause only mild symptoms in some people. However, others may experience a slight redness or watering, especially in the early stages.
Q3. Which conjunctivitis symptoms should never be ignored?

Ans: Persistent vision changes, severe pain, rapidly worsening redness, significant light sensitivity and heavy discharge are conjunctivitis symptoms that should never be ignored and require prompt medical assessment.
Q4. Are conjunctivitis symptoms different in men and women?

Ans: Conjunctivitis causes similar symptoms in men and women. The symptoms depend on the underlying cause, such as a viral infection, a bacterial infection or an allergy.
Q5. How can viral, bacterial and allergic conjunctivitis symptoms differ?

Ans: Viral conjunctivitis commonly causes watery discharge, bacterial conjunctivitis often causes sticky or pus-like discharge, and allergic conjunctivitis typically causes prominent itching and watering in both eyes. However, the patterns can overlap.
Q6. When should I see a doctor for conjunctivitis symptoms?

Ans: Talk to a doctor if conjunctivitis symptoms are severe, worsen, persist or if you notice vision changes, severe pain or light sensitivity. People who wear contact lenses and have suffered from painful red eyes should talk to a doctor immediately, because it increases the risk of corneal infection.
Q7. Can conjunctivitis symptoms vary in intensity?

Ans: Yes, symptoms of conjunctivitis may vary from mild redness and watering to significant discharge, irritation and swelling. The severity and pattern can vary depending on the cause, whether it is viral, bacterial or allergic.
Q8. Which conjunctivitis symptoms indicate an emergency?

Ans: Conjunctivitis symptoms like severe eye pain or light sensitivity, sudden vision loss or changes, severe eye injury or red eye accompanied by a severe headache and nausea may indicate an emergency.

References
- https://www.mayoclinic.org/diseases-conditions/pink-eye/symptoms-causes/syc-20376355
- https://my.clevelandclinic.org/health/diseases/pink-eye-conjunctivitis
- https://www.cdc.gov/conjunctivitis/about/index.html
- https://www.uhc.com/news-articles/healthy-living/pink-eye
- https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/conjunctivitis