Why We Assume the Worst, and How to Stop
The psychology behind negative assumptions and how to break the habit.
Posted March 24, 2026 | Reviewed by Margaret Foley
Co-authored by Lea Nguyen, MHC-LP, and Amy Vigliotti, PhD
Assumptions are the stories we tell ourselves to fill in the gaps when we don’t have complete information.
Our brains are wired for efficiency, so assumptions serve as mental shortcuts. In many ways, this ability helps us move quickly through the world. It’s much faster to jump to a conclusion than to slow down and analyze every complex social situation around us.
Sometimes, assuming the worst functions as emotional protection. If we expect rejection, betrayal, or abandonment, we feel less blindsided if it happens. These patterns often stem from anxiety , attachment insecurity, or relational trauma . In this way, negative assumptions can feel protective; it’s as though the brain is preparing us for pain before it arrives.
The problem is that what feels protective in the short term can quietly undermine connection in the long term. Since assumptions feel like facts, they can both shut down curiosity and interfere with our ability to relate accurately and openly with others. So, we stop asking questions, and we stop checking our interpretations. Instead, we react to a story we’ve constructed. Over time, this can lead to chronic resentment, unnecessary conflict, and emotional distance.
How CBT Helps Us Catch and Correct Faulty Assumptions
Cognitive Behavioral Therapy (CBT) is particularly effective in helping people recognize and revise distorted thinking patterns. CBT teaches that thoughts are not facts, but are instead mental events that can be examined.
Many assumptions fall into predictable “cognitive distortions.” One common distortion is fortune-telling: predicting a negative outcome without sufficient evidence (e.g., “She hasn’t texted back; she must be upset with me.”). Another one is mind reading : assuming we know what someone else is thinking (e.g., “He thinks I’m incompetent.”). There’s also catastrophizing (imagining the worst-case scenario), and personalization (assuming events are about us when they may not be).
CBT helps people slow down and ask:
Over time, this practice builds cognitive flexibility. Instead of automatically believing the first story the brain generates, we learn to test it. In doing so, we create space for more balanced, compassionate interpretations.
Five Ways to Shift From Assuming the Worst to Assuming the Best
Using techniques from CBT, there are simple, actionable steps to counter assumptions:
In my therapeutic work, there have been many times when a client caught an assumption, recognized it wasn’t true, and spared themselves pain.
One client had a tendency to interpret social situations through longstanding beliefs of exclusion and inadequacy. When she learned about an upcoming trip she wasn’t invited to, she immediately experienced it as a confirmation of a familiar narrative: “Why am I the only one not included?”
Once we paused to acknowledge the automatic assumption that others were intentionally excluding her, we began asking a different question: What information might be missing here? As we explored the situation further, she realized several of her friends had closer relationships with the host, and that she wasn’t actually the only one who hadn’t been invited. In fact, a handful of her friends weren’t invited either.
By slowing down and questioning the story her mind quickly constructed, she spared herself several layers of unnecessary emotional and relational pain: resentment toward her friends, reactive interpersonal behavior, and reinforcement of a deeply painful core belief about not belonging.
Moments like this are what cognitive flexibility looks like in real time: the ability to pause, examine an assumption, and consider that the story we’re telling ourselves may not be the full picture.
Assumptions are human. They are efficient, and sometimes they are protective, but when left unchecked, they can quietly distort reality and damage connection.
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Amy Vigliotti, Ph.D. , is a child and adult psychologist and the founder of the NYC group therapy practice, SelfWorks.
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This article is part of the Bringwise Psychology Journal — daily insights on human behavior, mental health, and personal growth.