A subconjunctival hemorrhage is when there is a broken blood vessel in the eye which causes bleeding under the conjunctiva. The conjunctiva is a clear mucous membrane which covers the eye and lines the eyelid. A subconjunctival hemorrhage may look scary, but it may go unnoticed by the person until someone else points it out, or until they look in the mirror. According to the Mayo Clinic, this type of hemorrhage can occur without any harm to the eye, and it can be caused by something as minor as a sneeze. It usually does not need to be treated, and in most cases, the redness goes away within two weeks.

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