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Conjunctivitis is an inflammation of the lining of the eye and eyelid.

Conjunctivitis is an inflammation of the lining of the eye and eyelid.
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Pink eye is another name for conjunctivitis. It is caused by inflammation of the outer layer of the eye and inside of the eyelid that causes the eye to turn pink. It can be highly contagious, and it is important to diagnose the exact cause to ensure the right treatment.

What is conjunctivitis?

Conjunctivitis means the white of the eye is pink due to inflammation of the clear covering over it (the conjuctivae).

If you have pink eye, you might also:

  • have tears
  • have a discharge, usually yellow or green, and crusty lashes, usually worse on waking
  • have itchy or burning eyes
  • be sensitive to light

Check your symptoms with healthdirect’s Symptom Checker to get advice on when to seek medical attention.

Causes of conjunctivitis

Conjunctivitis can be caused by:

Conjunctivitis caused by viral or bacterial infection is highly contagious.

Conjunctivitis diagnosis

Your doctor will talk to you and will examine you, especially your eyes.

Your doctor might take a sample of the secretions from your eye.

Conjunctivitis treatment

The treatment for conjunctivitis depends on the cause.

Viral infections improve without treatment, but bacterial infections require antibiotic eye drops. It can be difficult to tell them apart.

Allergic conjunctivitis is treated with antihistamine drops or tablets, and conjunctivitis due to irritants may be helped by anti-inflammatory drops.

If you have a foreign body in your eye, your doctor will need to remove it.

Conjunctivitis prevention

While adults can develop conjunctivitis, it is much more common among children. It is often contagious.

People with conjunctivitis should try not to touch their eyes, and should wash their hands regularly. This will reduce the risk of it spreading.

People using contact lenses should change them regularly.

People working with an irritant or in a dusty environment should wear eye protection. Learn more about eye care.

When to see a doctor

Whenever you have a conjunctivitis with any other symptoms, see your doctor if it doesn’t improve within hours.

Should I keep my child home from school?

Here’s a list of common childhood illnesses, including conjunctivitis, and their recommended exclusion periods.

Last reviewed: November 2017

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Top results


Conjunctivitis is an infection of the surface lining of the eye. It is very common in young children and most forms are highly contagious. Learn more here.

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Conjunctivitis causes sore, red and sticky eyes, a discharge from the eyes (pus)and swollen eyelids, most often caused by an infection by a virus or bacteria

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Allergic conjunctivitis usually causes mild to moderate symptoms, including redness, which respond to non medicated treatment. However, sometimes symptoms can be extremely severe and debilitating with swelling of the eyelids and conjunctivae and a sensation of grittiness and burning.

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Conjunctivitis is the most common cause of sore eyes. Find out about conjunctivitis and symptoms that indicate a more serious eye problem.

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