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Conjunctivitis

Conjunctivitis (red or pink eye) is an eye condition caused by infection or allergies. Some sexually transmitted infections (STIs) can cause conjunctivitis.

You can usually treat it at home if you're an adult. But your child might need to go to a GP or have urgent treatment.

Emergency action required: Ask for an urgent GP appointment or go to the emergency department if

  • your child has conjunctivitis and is less than 4 weeks old

If your child has conjunctivitis

Symptoms of conjunctivitis

Conjunctivitis usually makes your eyes:

  • bloodshot
  • itchy, gritty or sore
  • produce pus that sticks to your lashes
  • swollen
  • water

You or your child might also have flu-like symptoms.

Check if your conjunctivitis is contagious

Conjunctivitis can be contagious.

When it is caused by allergies like hay fever, conjunctivitis can make the eyes red and watery but it is not contagious.

A sticky eye producing pus caused by conjunctivitis.
Conjunctivitis that produces sticky pus is contagious.
A red and gritty eye caused by conjunctivitis.
If eyes are red and feel gritty, the conjunctivitis is usually contagious.
A red and watery eye.
Conjunctivitis caused by allergies like hay fever makes your eyes red and watery, but it is not contagious.

Emergency action required: Ask for an urgent GP appointment or go to the emergency department if

you have conjunctivitis and:

  • pain in your eyes
  • changes in your vision, like wavy lines or flashing
  • intense redness in one or both eyes

These can be signs of a more serious eye problem.

Find urgent and emergency care

Non-urgent advice: Contact your GP or optician if

you have conjunctivitis and:

  • you wear contact lenses, have symptoms and spots on your eyelids - you might be allergic to the lenses
  • your symptoms have not cleared up after 2 weeks

If your child has conjunctivitis

Take your baby to your GP if you think they have conjunctivitis.

A baby with sticky pus and yellow crusts on their eyelashes.
Conjunctivitis in a newborn baby.

Emergency action required: Ask for an urgent GP appointment or go to the emergency department if

your child has symptoms and:

  • is less than 4 weeks old
  • is in severe pain
  • has blurry vision, even after you've cleaned their eyes
  • might have something in their eye, such as sand or grit
  • has a rash - your child could have an infection like measles
  • wears contact lenses
  • feels more pain when looking at light (photophobia)

Find urgent and emergency care

Non-urgent advice: Contact your GP if your child:

  • has 1 or 2 red eyes for more than 2 days
  • has painful or uncomfortable eyes for more than 2 days
  • is distressed by conjunctivitis symptoms
  • has sticky eyes for 2 weeks or more

Treatment from a GP or pharmacist

Treatment for conjunctivitis depends on the cause.

Your GP might prescribe:

  • antibiotic eye drops - if the cause is a bacterial infection
  • antihistamine medicines - if the cause is an allergy

Your pharmacist can also give you advice. Check that you know the cause of the conjunctivitis. Antibiotics do not work on conjunctivitis caused by a virus or an allergy.

Your GP or pharmacist will tell you how to ease the symptoms at home if you have conjunctivitis caused by a virus.

Treating conjunctivitis at home

There are things you can do to help ease your symptoms.

  1. Wash your hands.
  2. Boil water and let it cool down completely.
  3. Wet a clean cotton wool pad in the cooled water.
  4. Gently wipe your eye from the inner to the outer corner of your eye.
  5. Repeat this for your other eye - use a new cotton wool pad for each eye.

You can also hold a clean, cold flannel on your eyes for a few minutes to cool them down

Do not wear contact lenses until your eyes are better.

Using breast milk to treat your child's conjunctivitis

There is no evidence that putting breast milk in your baby's eyes clears conjunctivitis. But it is unlikely to cause harm.

Never put formula milk into your baby's eyes.

Stop contagious conjunctivitis spreading

There are things you can do to stop conjunctivitis spreading to other people.

Do

  • wash your or your child's hands often with warm soapy water

  • wash your child's hands immediately if they touch their eyes

  • tell your child not to touch or rub their eyes

  • wash pillows and face cloths in hot water and detergent

Don't

  • do not share towels and pillows

  • do not rub your eyes

Staying away from work or school

You do not need to stay away from work or school unless you or your child feel very unwell.

If your child has conjunctivitis, check that your childcare provider can look after your child.


Content supplied by the NHS and adapted for Ireland by the HSE

Page last reviewed: 29 April 2025
Next review due: 29 April 2028

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This project has received funding from the Government of Ireland’s Sláintecare Integration Fund 2019 under Grant Agreement Number 8.