What useful biological function does the process of crying serve?

Question

I realize that many people feel emotional release from crying, but I am interested in the biological/phisiological causes and effects relating to the crying process.

Can anyone explain?

Answer 1

Crying often happens when the eye is irritated by something foreign like dirt.  The tears work to flush the eye out and try to remove the foreign particle.  Also, tears contain enzymes that help protect the eye from infection.  When a person is physically hurt, the body receives a pain signal and tears often flow.  It's like self-defense.  The body is getting ready to keep the eyes from getting infected.  Also the enzymes in tears can help kill bacteria on the skin when they travel down the face.

Answer 2

The emotional release that you mention is the result of hormones released by crying. These hormones are taken up in the brain and cause one to feel better.