This article on Plastic says that in many cases, keeping a stiff upper lip and NOT talking about the bad things that have happened to you is actually better for your health.
It examines heart attack sufferers and rape survivors.
I think this is interesting for two reasons.
One is that my mom went through therapy for some stuff and they had her talk about all her bad stuff, but then they didn't do anything with it. Their view was that if she talked about it, she would be better off. So they asked her about it and she talked about it for a long time. Then, they were done. But my mom had all that trash out in the open, visible wounds, and she was actually WORSE off after the discussions.
Another is that many rape survivors find themselves unable to talk about what happened to them, for various reasons. Which I am not going to go into here.
Thought the study was interesting.