Common Causes of Eye Pain

6. Pink Eye

Conjunctivitis, more commonly known as pink eye, is inflammation of the transparent membrane that lines both the eyeball and the eyelid. This area, the conjunctiva, becomes red or pink when its blood vessels become swollen and irritated. Viral infections are usually the cause of pink eye, but bacteria and allergens like animal hair and pollen can also be the culprits.

While the condition can be annoying and painful, it rarely leads to any severe side effects.