Some thoughts help you solve a problem. Others keep reopening it.
When does thinking become overthinking?
Thinking is useful. You may replay a conversation to understand it, consider what you could do differently, or prepare for something ahead.
Sometimes thinking stops producing anything new. You repeat the same question and reach the same answer. It may still feel like problem-solving even when no new understanding or action appears.
Psychologists often distinguish rumination—repetitive thinking about past distress—from worry, which usually focuses on possible future threats. Both can be forms of repetitive negative thinking (Stenzel et al., 2025).
Why does the mind return to the past?
An event can end while the mind continues working on it. A conversation is over or a message has been sent, but questions remain:
- What did they mean?
- Why did I say that?
- What if I had responded differently?
The mind may be looking for certainty, meaning, or a way to prevent the same result. That is why simply telling yourself to stop thinking often does not help.
Does rumination solve the problem?
Reflection can help when it leads to new understanding, a decision, or a practical next step. Repetition is different. If you keep reviewing the same information without learning anything new, the thinking may have become rumination.
Ask: “Is this thinking helping me understand something or choose what to do next?”
Research suggests that psychological interventions can reduce both rumination and worry. Stenzel et al. (2025) reviewed 55 studies with 4,970 participants and found a moderate overall effect of CBT on repetitive negative thinking. McCarrick et al. (2021) found a medium effect on rumination and a small-to-medium effect on worry.
Why can forcing a thought away make it more noticeable?
Trying not to think about something can make the mind keep checking whether the thought has returned. This can make it feel more noticeable.
A gentler response may be: “I notice this thought is here again. Is there a useful action I can take, or is it time to move my attention elsewhere?”
Key message
- Not every thought needs to be processed again.
- Useful reflection leads to understanding, a decision, or an action.
- You can notice a thought without continuing to follow it.
- Seek qualified mental-health support if repetitive thoughts are persistent, distressing, or disrupting daily life.
References
- McCarrick, D., Prestwich, A., Prudenzi, A., & O’Connor, D. B. (2021). Health effects of psychological interventions for worry and rumination: A meta-analysis. Health Psychology, 40(9), 617–630. https://doi.org/10.1037/hea0000985
- Stenzel, K. L., Keller, J., Kirchner, L., Rief, W., & Berg, M. (2025). Efficacy of cognitive behavioral therapy in treating repetitive negative thinking, rumination, and worry—A transdiagnostic meta-analysis. Psychological Medicine, 55, e31. https://doi.org/10.1017/S0033291725000017