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Studies show crying can relieve stress for a week.Correlation, causation, etc?
I.e. I can easily imagine that, if something is seriously weighting on your mind, opening up about it and even crying would reduce stress.
It might even be the other way: That once people get a moment to de-stress and get a chance to mentally process some devastating event, they will cry.
I find it much harder to believe that just crying about some random, unrelated thing will magically make you more relaxed.