Conjunctivitis: Why Your Eyes Are Red, Itchy, or Sticky

Conjunctivitis, commonly known as pink eye, is an inflammation of the conjunctiva—the thin, transparent membrane that lines the inner surface of your eyelids and covers the white part of your eyeball. While it is often associated with the classic reddish-pink hue, conjunctivitis is a complex condition with several distinct causes, ranging from highly contagious infections to seasonal allergies.

The Four Primary Types of Conjunctivitis

Understanding the cause of the inflammation is critical for determining how to treat it and whether you need to isolate yourself from others.

Type	Common Causes	Contagious?	Typical Symptoms
Viral	Adenoviruses (most common), herpes simplex, or COVID-19.	Highly	Watery, clear discharge; often starts in one eye and spreads to the other.
Bacterial	Staph or strep bacteria; sometimes related to STIs like chlamydia or gonorrhea.	Highly	Thick, yellow or green discharge; eyelids often "stuck shut" in the morning.
Allergic	Pollen, pet dander, dust mites, or mold.	No	Intense itching and tearing; usually affects both eyes simultaneously.
Irritant	Smoke, pool chlorine, cosmetics, or foreign objects.	No	Redness and watering after contact with a specific substance.

Identifying the Symptoms

While redness is the hallmark sign, other symptoms can provide clues to the underlying cause:

• A "Gritty" Feeling: Many patients describe the sensation of sand or a foreign object stuck in their eye.

• Discharge: Viral and allergic types typically produce watery fluid, while bacterial infections often result in a thicker, stickier pus.

• Morning Crusting: Discharge can dry overnight, forming a crust on the eyelashes that makes it difficult to open the eyes upon waking.

• Sensitivity to Light (Photophobia): Bright lights may cause discomfort or mild pain.

  
  

Treatment and Home Care

Most mild cases of pink eye resolve on their own, but management depends entirely on the type.

• Viral Conjunctivitis: Since it is caused by a virus, antibiotics will not work. Treatment is focused on symptom relief using cool compresses and artificial tears.

• Bacterial Conjunctivitis: A doctor may prescribe antibiotic eye drops or ointments to shorten the duration of the infection and reduce the risk of spreading it.

• Allergic Conjunctivitis: Management involves avoiding the trigger and using over-the-counter antihistamine eye drops or oral allergy medications.

• Cleaning the Eyes: Use a fresh, clean cotton ball or washcloth soaked in warm water to gently wipe away discharge. Always wipe from the inner corner (near the nose) outward, and use a separate cloth for each eye to prevent cross-contamination.

Preventing the Spread

If you have an infectious form (viral or bacterial), it is as contagious as the common cold. To protect others:

1. Wash your hands frequently for at least 20 seconds, especially after touching your eyes.

2. Stop wearing contact lenses immediately until the infection has completely cleared.

3. Do not share personal items like towels, washcloths, pillows, or eye makeup.

4. Launder linens (pillowcases and towels) in hot water daily during the infection.

5. Discard any eye makeup or contact lenses used while you were symptomatic.

When to Seek Medical Attention

While often minor, some eye conditions that mimic pink eye can be serious. Seek professional help from an ophthalmologist or GP if you experience:

• Severe eye pain or deep aching.

• Vision changes (blurred vision that doesn't clear when you blink).

• Intense redness in just one eye.

• Symptoms that do not improve after 24–48 hours of starting treatment.

• Newborns with symptoms must see a doctor immediately.

Final Thoughts

Conjunctivitis is common and usually mild, but proper identification of the cause is essential for effective treatment.

With good hygiene and early care, most cases resolve quickly without complications.