The reason being, when you spend too much time ruminating over matters instead of talking them out, it'll often cause you to feel helpless, thus your brain will believe you're in danger when you're really not.
原因在於,如果你花太多時間重複咀嚼在意的事,而不是講出來,這樣通常會讓你感到無助,因此你的大腦會認為你身處危險之中,儘管你其實並沒有。