(HealthDay News) -- Pinkeye (conjunctivitis) is a common infection that can cause redness, itching, swelling and discharge.

Typically, pinkeye is not serious, but there are some symptoms that require a doctor's attention.

The U.S. Centers for Disease Control and Prevention says pinkeye should be evaluated by a doctor if the infected person:

  • Has severe or moderate pain in one or both eyes.
  • Has sensitivity to light or blurred vision.
  • Develops extreme redness in the eye.
  • Has a weakened immune system.
  • Has symptoms of a bacterial infection that don't begin to improve after 24 hours on an antibiotic.
  • Has symptoms that continually worsen or don't get better.
  • Has a preexisting eye condition that increases the risk of a more severe infection.