Problem-solving has a direction. You turn a difficulty over, land on something you can do, and the thought quiets down once you’ve done it or decided to leave it. Overthinking loops. The same questions come back in new clothes, you rehearse conversations that haven’t happened, and the more you think the less certain you feel.
A simple check: after ten minutes of thinking, do you have a next step? If so, write it down and schedule it. If not, the thinking has probably become worry or rumination, and more of it won’t help.
Three things that often do help: notice the pattern and name it (“I’m looping again”); move your attention somewhere concrete, such as your breath, your feet on the floor or a short walk; and if worries keep arriving, give them a set time, say fifteen minutes in the evening, and postpone them until then.
If overthinking is taking up most of your days, disturbing your sleep or making decisions feel impossible, therapy can help. CBT-based approaches are well suited to this.