A red eye is often caused by an infection or dry eyes, but there are lots of possible causes.
Do not try to diagnose it yourself.
If your eye does not hurt, your sight is not affected and you do not feel sick or unwell, it's probably nothing serious. It may get better on its own in a few days.
- your child is under 2 years old and has a red eye
- you have red eyes with a sticky discharge
- you have red patches in your eye or a problem with your eyelids or eyelashes for more than a few days
- you're worried about your eyes
If the GP or optician cannot find what's causing your red eye, they may refer you to an eye specialist (ophthalmologist) for tests.
- your baby has red eyes and they're less than 28 days old
- your eye is very painful and red
- you have a red eye and wear contact lenses - you could have an eye infection
You can call 111 or get help from 111 online.
Do not drive to A&E. Ask someone to drive you or call 999 and ask for an ambulance.
Bring any medicines you take with you.