What causes green discharge from the eye—Is It an Infection?

Green discharge from the eye—often called “green stuff coming out of eye”—can be unsettling. While it frequently points to an infection, other factors may be at play. This guide explains common causes, key signs, simple home care steps and when to see a healthcare professional.

What You’re Seeing: Green Discharge
• Colour: Yellowish-green or even bright green.
• Consistency: Thick, sticky or crusty—especially after sleep.
• Frequency: May build up throughout the day or only in the morning.

Why Discharge Happens
Your tear film normally washes away debris and microbes. When that system is overloaded—by bacteria, viruses or blocked tear ducts—the eye produces excess mucus or pus. The green tint comes from a combination of white blood cells (fighting infection) and bacterial pigments.

1. Bacterial Conjunctivitis (Pink Eye)
   This is the most common cause of green eye discharge. A variety of bacteria (Staphylococcus, Streptococcus, Haemophilus) invade the conjunctiva (the thin membrane covering the white part of your eye).
   Key features:

• Thick, green or yellow pus
• Eyelids stick together, especially after sleep
• One eye often starts first, but it can spread to both
• Redness and irritation
• Mild pain or gritty feeling

2. Viral Conjunctivitis
   Viruses (adenovirus, herpes simplex) cause a more watery discharge. It’s contagious but usually less gooey than bacterial forms. You may still see some mucus that turns slightly whitish or green if a secondary bacterial infection sets in.
   Key features:

• Watery or clear discharge
• Itchy, red eyes
• Often accompanies a cold or respiratory infection
• Tearing rather than thick pus

3. Allergic Conjunctivitis
   Pollen, pet dander or other allergens irritate the eye lining. Discharge is typically clear or white. If you rub your eyes a lot, you can cause small scratches that allow bacteria in, leading to colored discharge.
   Key features:

• Itchy, watery eyes
• Both eyes affected equally
• Sneezing, nasal congestion or other allergy signs

4. Blocked Tear Duct (Dacryostenosis)
   More common in newborns, but adults can develop it too. Tears can’t drain properly, leading to buildup of bacteria-laden fluid. Chronic low-grade infection can produce greenish discharge.
   Key features:

• Tearing up more than normal
• Sticky eye crusting, especially in the morning
• Possible swelling near the inner corner of the eye

5. Contact Lens–Related Issues
   Wearing lenses too long or poor lens hygiene can introduce bacteria onto the eye surface (corneal ulcer) or conjunctiva. This may cause a greenish pus.
   Key features:

• Severe pain or sensitivity to light
• Blurry vision
• Redness and swelling around the cornea

Other causes (less common)

• Trauma or foreign bodies (metal, plastic shards)
• Eye surgery complications
• Rarely, more serious eye infections (endophthalmitis)

When to Suspect an Infection
If you notice any of the following alongside green discharge, infection is likely:
• Eyelid redness and swelling
• Persistent pain or aching around the eye
• Sensitivity to light (photophobia)
• Changes in vision (blurriness, halos)
• Discharge worsening over 24–48 hours
• Fever or feeling generally unwell

Self-Care and Home Management
Many mild eye infections improve with basic hygiene and over-the-counter (OTC) support.

1. Gentle Cleaning

• Wash hands thoroughly before touching your eyes.
• Use a clean, warm (not hot) compress over closed lids for 5–10 minutes, 3–4 times a day.
• Wipe away discharge with a fresh cotton pad or soft cloth each time.

2. Avoid Contact Lenses and Makeup

• Switch to glasses until symptoms clear.
• Discard any eye makeup and applicators used during the infection.

3. Artificial Tears

• Lubricating eye drops can help flush irritants and soothe dryness.
• Avoid drops labeled “redness relief”—they can worsen rebound redness.

4. Practice Good Hygiene

• Don’t share towels, pillows or washcloths.
• Wash pillowcases, towels and bed linens regularly.
• Keep hands away from your eyes.

5. Over-the-Counter Options

• Some OTC antibiotic ointments/drops are available without prescription in certain regions—but check with a pharmacist first.

When to Seek Medical Care
Green discharge often means bacteria are present, and you may need prescription antibiotics. See a doctor if you experience:

• No improvement after 2–3 days of self-care
• Severe pain, worsening redness or vision changes
• Signs of spreading infection (eyelid skin swelling beyond the eye)
• High fever or unusual headache (possible orbital cellulitis)

Diagnosing the Cause
A healthcare professional will:

• Review your symptoms and medical history
• Examine your eyes under a slit lamp (microscope)
• Possibly swab discharge for culture to identify bacteria
• Rule out corneal ulcers or more serious eye conditions

Treatment Options

1. Antibiotic Eye Drops or Ointment

• Common choices: erythromycin ointment, polymyxin–trimethoprim drops or fluoroquinolones for more severe cases.
• Usually prescribed 3–4 times daily for 5–7 days.

2. Oral Antibiotics

• Reserved for severe infections or those spreading beyond the eye.

3. Allergy Treatments

• Antihistamine eye drops or oral medications if allergies are the root cause.

4. Tear Duct Probing (for infants with blocked tear ducts)

• A minor office procedure to open the duct.

Preventing Future Infections
• Practice strict lens hygiene (replace lenses and cases as recommended).
• Avoid touching or rubbing your eyes.
• Wash your hands frequently—especially before face/eye contact.
• Replace eye cosmetics every 3–6 months.
• Keep household surfaces clean and disinfect shared items.

Online Symptom Check
If you’re curious whether your “green stuff coming out of eye” warrants a doctor’s visit, try a free, online symptom check for Eye booger. It can help you gauge urgency and next steps.

Key Takeaways

• Green eye discharge most often signals a bacterial infection but can also follow viral, allergic or tear-duct issues.
• Early self-care—warm compresses, gentle cleaning, stopping contact lens use—can ease mild cases.
• Persistent, severe or vision-threatening symptoms need prompt medical evaluation.
• Don’t share personal items or eye drops, and maintain good hand and lens hygiene.

Remember, while many eye infections clear with basic care and antibiotic drops, serious conditions can arise. Always speak to a doctor about any eye problem that is severe, getting worse or affecting your vision.