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The Science of Co-Rumination: When Talking It Out Keeps You In It

Rehashing a problem with your closest friend feels like the healthiest thing you can do — and the research says it genuinely builds closeness. It also says something less comfortable: extensively revisiting problems, speculating about causes, and dwelling on negative feelings together predicts increases in anxiety and depression over time, and in the lab it raises the stress hormone cortisol. Psychologists call this pattern co-rumination, and its defining finding is a trade-off: the same conversations that deepen a friendship can deepen the distress. Here's how the science got there.

608third- to ninth-graders in the 2002 study that named co-rumination — where the same problem-rehashing behavior was linked to closer friendships and to more depression and anxiety, and girls reported doing it more than boys Both ↑is the trade-off the prospective data documented: over time, co-rumination predicted increases in friendship quality and increases in depressive and anxiety symptoms — the benefit and the cost travel together ↑ cortisolis what a lab session of co-rumination produced in young women — a significant rise in the stress hormone after problem-focused talk, controlling for baseline levels: the body registered the rehash as stress, not relief 4 channelsof co-rumination — in person, text, social media, phone — compared in a 2024 prospective study of adolescents: the modalities had different associations with later depressive symptoms, with greater phone co-rumination predicting increases over time

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