Why am I having green mucus in eye?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Green mucus in the eye is typically caused by a bacterial infection, such as bacterial conjunctivitis (pink eye). When bacteria invade the eye, your immune system responds by producing thick, greenish-yellow discharge containing white blood cells working to fight off the germs. This discharge may crust over the eyelids, especially after sleep, and is often accompanied by redness, irritation, or swelling.

Because green eye discharge can signal an infection that may require antibiotic treatment, it's important not to ignore the symptom. Left untreated, bacterial eye infections can worsen or spread. To quickly understand what may be causing your symptoms and what to do next, take a free, instant, online symptom check—it's a smart first step to help you decide whether home care is enough or if you should see a doctor.

Reviewed for medical accuracy: 07/15/2026

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Explanation

When you see green mucus coming from your eye, it usually means that an infection might be present. Bacterial infections, such as bacterial conjunctivitis, can make the eye produce extra mucus that turns green.

This green color happens because your body is fighting the bacteria by sending white blood cells to the area. These cells mix with the mucus, giving it a greenish tint. You might also notice other symptoms like redness, itchiness, or the eye feeling sore. It's important to remember that green mucus is not just a normal reaction to dust or allergies; it is more often a signal that your eye needs treatment, like antibiotic eye drops.

If you have green mucus along with discomfort or changes in your vision, you can use Ubie's free AI-powered symptom checker to help identify what might be causing your symptoms and determine whether you need to see an eye doctor for treatment with antibiotics so your eye can heal properly.

(References)

Watson S, Cabrera-Aguas M, Khoo P. Common eye infections. Aust Prescr. 2018 Jun;41(3):67-72. doi: 10.18773/austprescr.2018.016. Epub 2018 Jun 1. PMID: 29922000; PMCID: PMC6003010.
Pippin MM, Le JK. Bacterial Conjunctivitis. [Updated 2023 Aug 17]. In: StatPearls [Internet].
Gurnani B, Kaur K. Bacterial Keratitis. [Updated 2023 Jun 11]. In: StatPearls [Internet].

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