6 Main Causes of Conjunctivitis: What You Need to Know

Conjunctivitis, also called pink eye, is a common eye problem. It happens when the thin layer covering the white part of your eye gets inflamed. Many people wonder about the main causes of conjunctivitis. In this blog, you will learn about the six main causes of conjunctivitis, their symptoms, and how conjunctivitis spreads. Knowing these causes can help you protect your eyes and those around you.

1. Viral Infections

First, viral infections are a leading cause of conjunctivitis. Viruses, like those that cause the common cold, can infect your eyes. Often, viral conjunctivitis spreads easily from person to person. For example, touching your eyes after sneezing can pass the virus.

Common symptoms: Watery eyes, redness, and a gritty feeling

Risk factors: Close contact with someone who has a cold or pink eye

Examples: Adenovirus is a frequent cause

According to the CDC, viral conjunctivitis is highly contagious. Therefore, washing your hands often can help prevent its spread.

2. Bacterial Infections

Next, bacterial infections are another main cause of conjunctivitis. Bacteria can enter the eye through dirty hands or contact lenses. As a result, the eyes may become red and sticky.

Common symptoms: Thick yellow or green discharge, redness, and swelling

Risk factors: Poor hand hygiene, sharing towels, or using old makeup

Examples: Streptococcus and Staphylococcus bacteria

In many cases, antibiotics are needed to treat bacterial conjunctivitis. However, always consult a doctor before starting treatment.

3. Allergies

Allergic conjunctivitis happens when your eyes react to things like pollen or dust. Because allergies are common, many people experience this type of pink eye, especially during certain seasons.

Common symptoms: Itchy eyes, redness, and watery discharge

Risk factors: History of allergies, exposure to pollen, pets, or dust mites

Examples: Hay fever, pet dander, or mold

Unlike infections, allergic conjunctivitis is not contagious. Still, avoiding triggers can help reduce symptoms.

4. Irritants and Chemicals

Sometimes, irritants or chemicals can cause conjunctivitis. For instance, smoke, chlorine from pools, or cleaning products may irritate your eyes. This type is called irritant conjunctivitis.

Common symptoms: Redness, burning, and watery eyes

Risk factors: Exposure to smoke, strong fumes, or chemicals

Examples: Swimming pools, air pollution, or household cleaners

If you get chemicals in your eyes, rinse them with clean water right away. Then, seek medical help if symptoms persist.

5. Foreign Bodies

Foreign bodies, like dust or sand, can also lead to conjunctivitis. When something gets stuck in your eye, it can cause irritation and redness. For example, rubbing your eyes after being outside may introduce particles.

Common symptoms: Redness, pain, and a feeling that something is in the eye

Risk factors: Outdoor activities, windy weather, or not wearing eye protection

Examples: Sand, dust, or small insects

After removing the foreign object, symptoms usually improve. However, if pain or redness continues, see an eye doctor.

6. Newborn Conjunctivitis (Ophthalmia Neonatorum)

Finally, newborns can get a special type of conjunctivitis called ophthalmia neonatorum. This happens when babies are exposed to bacteria during birth. Early treatment is very important to prevent serious eye problems.

Common symptoms: Redness, swelling, and discharge in a newborn’s eyes

Risk factors: Mothers with untreated infections, premature birth

Examples: Chlamydia or gonorrhea infections passed from mother to baby

Because newborn conjunctivitis can be serious, doctors often give eye drops to babies soon after birth. The World Health Organization recommends early care for all newborns.

Summary

In summary, the main causes of conjunctivitis include viral and bacterial infections, allergies, irritants, foreign bodies, and newborn infections. Each type has its own symptoms and risk factors. However, knowing these causes can help you prevent and manage pink eye. For more details, you can visit trusted sources like the CDC and WHO.

If you or your child has symptoms of conjunctivitis, consult an eye care specialist Dr. Pallavi Gupta Reddy. Early treatment can protect your vision and stop the spread to others.