don't dwell on painful thoughts

Recent research about collective trauma such as a school shooting shows that not expressing one's feelings was healthier than letting it all out. This is contrary to what many have believed for a long time - that it's best to talk out your pain.

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However, maybe dwelling on pain strengthens its negative feelings in the circuitry of the brain.

http://www.sciencedaily.com/releases/2008/06/080601092206.htm