Red eye describes when the white part of the eye looks pink or bloodshot. It can be harmless but sometimes signals a more serious problem that needs prompt care.
Common causes of red eye
Redness happens when tiny surface blood vessels swell or leak. This can follow irritation, dryness, allergy, infection, or raised pressure inside the eye.
- Dry eye and blepharitis cause grittiness, burning, and intermittent redness.
- Conjunctivitis often brings discharge and stickiness, sometimes spreading between family members.
- Inflammation inside the eye, such as uveitis, usually causes pain and light sensitivity.
- Acute glaucoma is an emergency with severe pain, blurred vision, halos, and headache.
- Injury or a chemical burn can make the eye very red, sore, and watery.
When to seek urgent help
Mild redness without pain or vision change often settles with lubricating drops and rest. However, some warning signs mean you should arrange same day assessment.
- Red eye with moderate or severe pain, nausea, or headache.
- Sudden blur, shadow, or strong sensitivity to light.
- History of recent trauma, surgery, or chemical exposure to the eye.
- Redness in a contact lens wearer that does not improve quickly with lens removal.
- Recurrent red eye episodes, especially if linked with joint, skin, or general health problems.
