Suppressing Negative Thoughts May Be Good for Mental Health After All, Study Suggests
For years, people have often been told that trying to suppress negative thoughts could make them stronger. A new study suggests that this widely held belief may not always be correct. Researchers found that deliberately suppressing fearful thoughts could make those thoughts less vivid and less emotionally distressing, while also improving several measures of mental health.
A Different View of Negative Thoughts
Negative thoughts are a normal part of human experience. People may worry about illness, financial problems, family difficulties, future uncertainty, relationships, work or other stressful events. When these thoughts repeatedly return, however, they can contribute to anxiety, worry and emotional distress.
A long-standing psychological idea has suggested that deliberately pushing unwanted thoughts away may cause them to return even more strongly. The familiar example is being told not to think about something, which can make the forbidden thought seem even more noticeable.
The new research challenges the idea that suppressing every negative thought is necessarily harmful. Instead, it suggests that under certain circumstances, people may be able to learn a form of thought suppression that reduces the emotional power of specific fearful memories or imagined events.
What Did the Researchers Study?
Researchers from the University of Cambridge’s Medical Research Council Cognition and Brain Sciences Unit trained 120 volunteers from 16 countries to practice suppressing thoughts about events they feared might happen.
The findings were published in Science Advances and examined whether inhibitory control could be used to reduce the retrieval of unwanted fearful thoughts.
Participants identified future events that concerned them. These included negative fears and worries, positive hopes and dreams, and ordinary neutral events. Each imagined event was associated with a cue word that could later trigger the memory or thought.
During training, participants were repeatedly shown cues associated with different events. In some trials they were instructed to imagine an event, while in other trials they were instructed not to imagine the associated event and instead suppress the thoughts and images that the cue might trigger.
Negative Thoughts Became Less Vivid
One of the most notable findings was that events participants practiced suppressing became less vivid. They also reported that these events generated less anxiety and emotional intensity.
Importantly, the researchers did not find evidence of a strong rebound effect in which suppressed events subsequently became more vivid. Only a small number of participants showed increased detail recall after suppression training.
Mental Health Also Improved
The researchers also examined broader measures of mental health, including depression, anxiety, worry, positive and negative emotional states, and overall wellbeing.
Overall, participants who practiced suppressing fearful thoughts showed improvements in several mental-health measures. The effects were particularly noticeable among people who began the study with greater levels of mental-health symptoms.
The study also included participants with symptoms consistent with post-traumatic stress. Among this group, participants who suppressed negative thoughts showed larger improvements than those who practiced suppressing neutral events.
The important point: The researchers were not suggesting that people should permanently avoid difficult emotions or refuse to address serious psychological problems. Instead, their findings suggest that deliberately preventing a specific fearful thought from being repeatedly retrieved may sometimes reduce its emotional impact.
Why Might Thought Suppression Work?
The researchers focused on a brain ability known as inhibitory control. This refers to the ability to override an automatic response or prevent a particular mental process from continuing.
When a reminder of a frightening event appears, the brain may automatically retrieve the associated memory or imagined scenario. Inhibitory control may help a person interrupt that retrieval process before the thought becomes a vivid mental experience.
With repeated practice, this may reduce the strength or accessibility of the unwanted thought. Instead of repeatedly rehearsing the feared scenario, the person learns that encountering the reminder does not necessarily require mentally replaying the event.
Does This Mean We Should Suppress Every Negative Thought?
Not necessarily. The findings should not be interpreted as evidence that all negative emotions should be pushed away. Fear, sadness, anger and worry can sometimes provide useful information about problems that need attention.
There is also an important difference between intentionally interrupting the retrieval of a specific fearful scenario and refusing to acknowledge emotions or problems altogether. The study investigated a structured technique rather than ordinary emotional avoidance.
People experiencing persistent anxiety, depression, trauma-related symptoms or severe distress should not rely on thought suppression alone. Professional mental-health support may be appropriate when negative thoughts interfere significantly with daily life.
What the Findings Could Mean
The research provides an interesting new perspective on how people manage unwanted thoughts. Rather than assuming that every attempt to suppress a negative thought is harmful, researchers are investigating whether targeted suppression can sometimes reduce the intensity of distressing mental images.
The findings also highlight the importance of understanding the difference between thought suppression, emotional avoidance and healthy cognitive control. These processes may not have identical effects on the brain or on psychological wellbeing.
More research will be needed to determine how broadly the technique can be applied, how long the benefits last, and whether structured thought-suppression training could become useful as part of psychological interventions.
A Practical Lesson for Everyday Life
For everyday stress, people may benefit from learning several ways of responding to unwanted thoughts rather than assuming there is only one correct strategy. Some thoughts may be worth examining carefully, while others may be repetitive fears that do not require continued mental attention.
Practices such as mindfulness can also teach people to notice thoughts without automatically becoming absorbed in them. The goal is not necessarily to eliminate thinking, but to develop greater control over where attention goes.
Readers interested in practical approaches to calming the mind can explore how to meditate on The Science Online, which discusses breathing, present-moment awareness and observing thoughts without immediately reacting to them.
The Bigger Picture
The study adds to growing research into how the brain controls attention, memory and emotional responses. It suggests that the relationship between thought suppression and mental health may be more complicated than the simple idea that suppressing a thought always makes it stronger.
Instead, the effect may depend on what is being suppressed, how the technique is practiced and the psychological context in which it is used. Understanding these differences could eventually help researchers develop more precise approaches for managing intrusive fears and distressing mental imagery.
In summary: A study of 120 volunteers found that structured suppression of fearful thoughts could make those thoughts less vivid and less anxiety-provoking, while participants also showed improvements in several measures of mental health. The findings are promising, but further research is needed before the technique can be considered a broadly established mental-health treatment.
