1The process of continuously thinking about the same thoughts, which tend to be sad or dark, is called “rumination.”
A habit of rumination can be dangerous to your mental health as it can prolong or intensify depression as well as impair your ability to think and process emotions. It may also cause you to feel isolated and can, in reality, push people away.
https://www.thelionstares.com/post/attitude-do-you-know-what-rumination-is-trust-me-you-need-to
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