---
title: What causes eye chemosis (conjunctival swelling)?
description: "Chemosis is swelling of the clear membrane covering the white of the eye. It often looks like a blister or jelly-like bulge. ## Common causes Fluid leakage from small blood vessels in the conjunctiva leads to puffiness. This frequently follows…"
url: "https://bluefinvision.com/knowledge-base/topics/symptoms-signs/what-causes-eye-chemosis-conjunctival-swelling/"
updated: "2025-12-31"
category: "Symptoms & Signs"
---

# What causes eye chemosis (conjunctival swelling)?

Chemosis is swelling of the clear membrane covering the white of the eye. It often looks like a blister or jelly-like bulge.

## Common causes

Fluid leakage from small blood vessels in the conjunctiva leads to puffiness. This frequently follows irritation or allergy.

- Allergic conjunctivitis from pollen, dust, or pets
- Infection or severe dry eye
- Rubbing the eyes vigorously
- Post-surgical inflammation or trauma

## Serious underlying problems

Marked, one-sided chemosis with pain or limited eye movement can signal orbital disease. These cases require urgent evaluation.

- Orbital cellulitis infection behind the eye
- Thyroid eye disease with congestion and proptosis
- Carotid-cavernous fistula causing red, swollen eye
- Seek emergency care if chemosis accompanies fever or reduced vision