Conjunctivitis (Pink Eye)

Understand conjunctivitis, and its causes and symptoms.

Conjunctivitis (Pink Eye)


Conjunctivitis, also known as pink eye, is when the thin, transparent membrane (conjunctiva) that lines the inside of your eyelids and the white part of your eyeball (sclera) becomes swollen or irritated. It is a common eye condition that can be caused by various factors, including viruses, bacteria, allergens, or irritants.


Conjunctivitis is mainly caused by:

  • Viral infections (adenoviruses)
  • Bacterial infections (Staphylococcus aureus or Streptococcus pneumonia)
  • Allergens (pollen, pet dander, dust mites, or certain eye drops)


The most common symptoms to look out for are:

  • Pink (hence the name) or redness in one or both eyes
  • Itchiness or irritation in one or both eyes
  • Gritty feeling in one or both eyes
  • Tearing, or a watery thick discharge in one or both eyes
  • Crusty eyelashes the inability to open your eye in the morning because your eyelids or lashes have stuck together
  • Sensitivity to light (photophobia)

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