Tears are a spontaneous manifestation that allows everyone to be released and to feel better ... We explain to you what you need when you weep and why we cry! There are those who weep often and who do not know why they are shed tears ... Whatever the category of affiliation, we all shout out the emotion or the pain, the sadness, the whole multitude of feelings we can have within ourselves.
We cry because of the connection between the front part of the cerebral cortex and the limbic system, where the emotion is adjusted. In short, a strong emotion or an external stimulus can activate our nervous system, which in turn regulates the issue of crying.

Tears can come from emotional reactions or emotions. First, they are the ones that come when attacking harmful external particles, just as when we have an onion and we cry to remove harmful substances from ourselves. Second, there are tears that come as a reaction to a strong emotion, such as sadness or joy. In this case you not only cry but also have a number of physiological reactions such as frequent heartbeat, more sweating and irregular breathing.

When you weep and die, you're just back to a little kid. Indeed, crying the baby has the function of attracting the mother's attention so that she can provide the necessary care for her. Likewise, adult screaming takes on a rational function because it calls the comfort of others typing in social relationships.

Our body is a perfect system. So, perfect when experiencing a strong and painful emotion, as direct to us with a natural analgesic: tear. Emotional tears actually contain many hormones and among them a neurotransmitter called Leuenkephalin that works as a sedative release when the body is subjected to stress. It's no coincidence that after a big shout you feel better.
Source: Grazia.it