Virtually everyone has experienced the dread, anxiety and exhaustion that comes with overthinking. Maybe you replay conversations from hours, days, or even years ago, wondering if you said the wrong thing. Maybe you imagine every possible outcome before making a decision, only to feel even less certain. Or maybe your mind just never seems to switch off. But why do we do this?
Overthinking is the tendency to get caught in repetitive patterns of thinking—often about things outside of our control. Although it can feel like we’re solving a problem, it rarely leads to a solution. Instead, it often leaves us feeling more anxious, uncertain and mentally drained. It’s also different from healthy reflection. Reflective thinking helps us solve problems, make decisions and learn from our experiences. Overthinking does the opposite—it keeps us stuck. While “overthinking” isn’t a clinical term, psychologists often refer to rumination (dwelling on past events or emotions) and excessive worry (focusing on future uncertainty). These thinking patterns are common in anxiety disorders such as OCD and Generalised Anxiety Disorder, but they can also affect anyone, especially during periods of stress.
So, what keeps us trapped in these loops?
One explanation is our intolerance of uncertainty. Our brains naturally search for answers and certainty, but some situations simply don’t have a perfect solution. Overthinking begins when we keep searching anyway. It thrives on the “what ifs. “What if I made the wrong decision? What if I embarrassed myself? What if something goes wrong? The truth is, we could all spend hours analysing the past or trying to predict the future. But no amount of thinking can give us complete certainty. From an evolutionary perspective, this makes sense. Our brains evolved to scan for danger. Thousands of years ago, that might have meant spotting predators or finding food. Today, the “threats” are far less life-threatening—but our brains often respond as though they’re just as important. An important email. A difficult conversation. A job interview. The threat detection system is the same, even if the danger isn’t. It’s also no surprise that much of our overthinking centres around other people. Humans are an inherently social species, and feeling accepted by others has always mattered. As a result, our minds can become preoccupied with what others think of us, even when we have very little evidence that anything is wrong.
Ultimately, overthinking is a very human response. It’s our brain’s attempt to protect us from uncertainty and potential threat. The challenge is recognising when thinking has stopped being helpful—because sometimes, the answer isn’t to think harder, but to accept that not every question has an immediate answer.
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