In addition, when people are depressed, they will produce some bioactive substances that are harmful to the human body. When they cry, these harmful chemicals will be excreted with tears, thus effectively reducing the concentration of harmful substances and relieving tension. Some people think that there are some substances in the secretion of lacrimal gland, which can have therapeutic effect on some parts of the body after entering the blood, at least regulating skin health. People are injured, don't endure the pain, but cry freely, so as to speed up the natural healing of the wound.
Crying is a way to vent pressure, occasionally, but not everyone is suitable to relieve stress by crying. Generally speaking, different basic groups have different abilities to cope with stress. Usually, after crying, people's emotional intensity will be reduced by 40%, but after the repressed emotions are vented and relieved, they can't cry any more, otherwise it will do harm to the body.