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Pink eye, also called conjunctivitis, is a common and treatable eye condition caused by inflammation or an infection of the conjunctiva (a transparent membrane that covers the front of the eye). It typically stems from a virus or bacteria.
Depending on the type of conjunctivitis, pink eye can last anywhere from a few days for mild cases or up to 3 weeks for more severe cases.
Pink eye can be highly contagious with common symptoms, including:
Pink eye is divided into three different types: bacterial, viral, and allergic conjunctivitis. While many of their symptoms overlap, there are a few differences.
Bacterial conjunctivitis is highly contagious and caused by a bacterial infection, commonly from Staphylococcus aureus or Streptococcus pneumoniae. Bacterial pink eye is treated with antibiotic eye drops.
While symptoms of bacterial pink eye can differ from person to person, the classic signs and symptoms include:
People who wear contact lenses with a bacterial eye infection are at risk of developing bacterial keratitis (cornea infection). You should not wear contact lenses while you have conjunctivitis.
Viral conjunctivitis is the most common type of pink eye caused by a virus commonly linked to an adenovirus (runny nose and common cold). It is highly contagious and often spreads around schools and in crowded places.
Viral pink eye may occur while you have a cold, flu, or respiratory illness. It typically starts in one eye but may quickly spread to the other eye.
Common signs and symptoms of viral conjunctivitis include:
Allergic conjunctivitis is caused by an allergic reaction and is not contagious.
Common allergic conjunctivitis environmental triggers include:
Allergic conjunctivitis affects both eyes and causes itchy, red, swollen eyes. However, it does not typically cause discharge, which is one way healthcare professionals diagnose the different types of pink eye.
The type and severity of conjunctivitis affects how long it will last. If it is related to another illness such as the common cold, ear infection, or upper respiratory infection, recovery could be longer.
Healthcare professionals estimate recovery time for the different types of pink eye as:
While allergic conjunctivitis is not contagious, viral and bacterial pink eye are highly contagious.
It would be best to avoid close contact with other people until symptoms subside or 24 hours after starting antibiotic treatment for bacterial conjunctivitis.7
Viral and bacterial pink eye are easily transmissible and spread similarly to other viral and bacterial infections, including:
If you have symptoms of pink eye, you should avoid close contact and sharing items with others. It is also essential to cover your cough and sneeze to stop the spread of pink eye.
Most cases of pink eye will resolve on their own in a couple of days without formal treatment.
For severe cases of bacterial conjunctivitis, antibiotic treatment is prescribed by a healthcare professional. Symptoms will improve within 24 hours after eye drop administration.
You should seek medical attention and treatment if you experience the following:
Treating allergic conjunctivitis first includes eliminating and avoiding environmental triggers. Over-the-counter antihistamines, nonsteroidal anti-inflammatory medications, and artificial tears can help reduce symptoms of allergic conjunctivitis.
Resting with a cold compress can also relieve symptoms and minimize discomfort for all types of pink eye.
Viral and bacterial forms of pink eye easily spread from person to person. Fortunately, there are many steps you can take to prevent the spread of conjunctivitis, including:
Pink eye (conjunctivitis) results from inflammation of the conjunctiva (a transparent membrane that covers the front of the eye), typically caused by an allergic reaction or a viral or bacterial infection. Symptoms include red or pink eyes, irritation, discharge, itchiness, and soreness.
While allergic conjunctiva is not contagious, viral and bacterial pink eye are highly infectious. They spread through close contact with others and air transmission (coughing and sneezing).
Most cases of pink eye will resolve on their own after a couple of days. Bacterial conjunctivitis may need antibiotic eye drops, with symptoms improving within 24 hours of administration.
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