How does conjunctivitis start?

Conjunctivitis, also known as pink eye, is an inflammation of the conjunctiva, the thin membrane that lines the eyelid and covers the white part of the eye. It can be caused by a variety of factors, including bacteria, viruses, allergies, and irritants.

Bacterial conjunctivitis is the most common type of conjunctivitis. It is caused by bacteria such as Staphylococcus aureus and Streptococcus pneumoniae. Bacterial conjunctivitis is highly contagious and can spread easily through contact with an infected person or object.

Viral conjunctivitis is also very common. It is caused by viruses such as the adenovirus and the herpes simplex virus. Viral conjunctivitis is also contagious and can spread easily through contact with an infected person or object.

Allergic conjunctivitis is caused by an allergic reaction to substances such as pollen, dust, pet dander, and cosmetics. Allergic conjunctivitis is not contagious.

Irritant conjunctivitis is caused by exposure to irritants such as smoke, dust, chemicals, and fumes. Irritant conjunctivitis is not contagious.

Conjunctivitis typically starts with one or more of the following symptoms:

* Redness of the eye

* Swelling of the eyelid

* Itching

* Burning

* Tearing

* Discharge from the eye

* Blurred vision

* Sensitivity to light

If you experience any of these symptoms, it is important to see a doctor to determine the cause of your conjunctivitis and to get the appropriate treatment.