Pink eye, also known as conjunctivitis, is an inflammation of the transparent membrane that lines the eyelid and eyeball, called the conjunctiva. When small blood vessels in the conjunctiva become swollen and irritated, they become more visible, causing the whites of the eyes to appear reddish or pink. Pink eye can be caused by a variety of factors, including:
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Viruses: Viral infections are the most common cause of pink eye in adults. Adenoviruses are the most common type of virus that causes pink eye.
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Bacteria: Bacterial infections can also cause pink eye, although they are less common than viral infections. Common types of bacteria that cause bacterial conjunctivitis include Staphylococcus aureus, Streptococcus pneumonia, and Haemophilus influenzae.
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Allergens: Allergic reactions to things like pollen, dust mites, molds, animal dander, and certain medications can cause pink eye.
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Chemicals: Exposure to certain chemicals, such as those found in chlorine or air pollution, can cause pink eye.
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Foreign bodies: A foreign body in the eye, such as a loose eyelash or a piece of dirt, can cause pink eye.
Pink eye can also be caused by other factors, such as fungi, parasites, and certain diseases. It can be difficult to determine the exact cause of pink eye because some symptoms may be the same no matter the cause. If you suspect you have pink eye, its important to see a healthcare provider to determine the cause and receive appropriate treatment.
