Lots of different things can cause a red eye.
Your symptoms might give you an idea of what's causing it.
If your eye does not hurt and your sight is not affected, it's probably nothing serious. It may get better on its own in a few days.
- you have a red eye for more than a few days
- your child is under 2 years old and has a red eye
If your GP 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 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.