People who spend a great deal of time analysing situations, searching for explanations and imagining possible outcomes may find it harder to switch their thoughts off, with researchers linking anxiety to several cognitive processes involving attention, working memory and mental flexibility.
The idea that highly intelligent people are particularly prone to anxiety has become increasingly popular, largely because complex thinking can involve considering multiple possibilities rather than accepting the first explanation that comes to mind. But intelligence itself has not been established as a direct cause of anxiety.
Brandspur News reports that recent research instead points to a complicated relationship between anxiety and cognitive functioning. A 2024 systematic review examining anxiety disorders among young people found mixed results across areas such as memory, attention, language and executive functioning, and found no evidence that anxiety disorders were associated with lower IQ.
One feature commonly associated with anxiety is excessive worry. The mind repeatedly returns to possible problems, tries to predict what could happen next and searches for ways to prevent an unwanted outcome. That constant mental activity can make it difficult for some people to disengage from worrying thoughts.
A separate systematic review and meta analysis published in 2025 examined 32 studies involving more than 13,000 participants and found that generalised anxiety disorder was associated with poorer cognitive flexibility and working memory. The researchers also found that the relationship was not simply a matter of reduced intelligence, highlighting the difference between being intelligent and experiencing anxiety related cognitive difficulties.
Researchers studying generalised anxiety disorder have also examined how worry can interfere with attentional control. A 2024 review found evidence linking anxiety and worry with difficulties in areas including selective attention, working memory, cognitive flexibility and planning, although the strength and nature of these effects varied across studies.
This helps explain why overthinking can feel exhausting. Instead of processing a problem once and moving on, an anxious mind may continue examining the same situation from different angles, looking for certainty that may not be possible to obtain.
For someone who naturally notices details and enjoys analysing possibilities, that tendency can be useful in some situations. It can support careful decision making, planning and problem solving. But when the same mental process becomes dominated by fear, uncertainty or imagined negative outcomes, it can become difficult to control.
The distinction is important because being intelligent does not automatically make someone anxious, just as experiencing anxiety does not mean a person lacks intelligence. Anxiety can affect people across different levels of cognitive ability, and researchers continue to investigate how individual thinking patterns, attention and emotional responses interact.
The popular description of an intelligent person whose mind “never switches off” therefore captures part of the experience some people may recognise, but it should not be treated as a scientific rule. The relationship between intelligence, complex thinking and anxiety is considerably more complicated than the viral claim suggests.
