Don't hold back the tears

From the ThirdAge website
Did you know that tears contain toxins? Sounds like crying may remove byproducts of stress from the body. What does this mean for mind-body health?
Humans are the only animals who shed tears of emotion. Why do we cry? Are there any physical or health benefits from crying?
Years of tears
"Until the Industrial Revolution, crying in public was pretty normal, even for men," says Tom Lutz, Ph.D., an associate professor of English at the University of Iowa and author of Crying: The Natural and Cultural History of Tears. "Heroic epics from Greek times through the Middle Ages are soggy with weeping of all sorts," Dr. Lutz says. "Through most of history, tearlessness has not been the standard of manliness."
For instance, when Roland, the most famous warrior of medieval France died, 20,000 other knights wept so profusely they fainted and fell from their horses. Long before that, the Greek warrior Odysseus cries in almost every chapter of Homer's Iliad while St. Francis of Assisi was said to have been blinded by weeping. Later, in the 16th century, sobbing openly at a play, opera or symphony was considered appropriately sensitive for men and women alike.
Tearless generations
The industrial age needed diligent, not emotional, workers. Crying was then delegated to privacy, behind closed doors. Children learned that weeping itself was the problem and not the result of a problem. People everywhere became more uncomfortable with public tears.
The purpose of crying
Throughout history and in every culture, people cry. "Weeping often occurs at precisely those times when we are least able to fully verbalize complex, overwhelming emotions and least able to fully articulate our feelings," Lutz writes.
Crying can also be an escape; it allows us to turn away from the cause of our anguish, and inward toward our own bodily sensations. Scientists feel that weeping is probably necessary because no human behavior has ever continuously evolved unless it somehow contributed to survival.
"Science has proven that stress is terrible for the health of your brain, heart and other organs," says William Frey II, Ph.D., biochemist and tear expert of the Ramsey Medical Center in Minnesota. "It isn't proven yet, but weeping has most likely served humans throughout our evolutionary history by reducing stress."

Studying the waterworks
In one oft-quoted study, Frey studied five different groups of people. The people kept records of all emotional and irritant crying episodes for a period of 30 days. Information such as date, time, duration, reason for crying, thoughts, emotions and physical components, such as "lump in throat," watery eyes vs. flowing tears, etc.
Frey found that 94 percent of the females had an emotional crying episode in the 30-day recording period, as compared with only 55 percent of the males. Eighty-five percent of women and 73 percent of men reported feeling better and more relieved after a good cry. Dr. Frey's lab also chemically examined tears produced by onions and compared them with emotional tears. While chemical tears (caused by onions) were 98 percent water, emotional tears contained more toxins.
Why do people produce tears?
Tears are secreted through a duct, a process much like urination or exhalation. Frey believes that like these other processes, tearing may be involved in removing waste products or toxic substances from the body. .
"Crying is natural, healthy and curative," according to Barry M. Bernfeld, Ph.D., director of the Primal Institute in Los Angeles. "[But] crying which should be the most natural, accepted way of coping with pain, stress, and sorrow is hardly mentioned in psychiatric literature. Now we seem finally to recognize that crying is good for people."