"The act of thinking about an experience, as well as expressing emotions, seems to be important. In this way, writing helps people to organize thoughts and give meaning to a traumatic experience. Or the process of writing may enable them to learn to better regulate their emotions. It's also possible that writing about something fosters an intellectual process — the act of constructing a story about a traumatic event — that helps someone break free of the endless mental cycling more typical of brooding or rumination. Finally, when people open up privately about a traumatic event, they are more likely to talk with others about it — suggesting that writing leads indirectly to reaching out for social support that can aid healing."  (Harvard, 2011)  https://www.health.harvard.edu/newsletter_article/expressive-writing-for-mental-health