BiasProbability & risk · Cognitive Bias · Entry 112

Pessimism Bias – when you believe everything will go wrong

Electric editorial collage illustrating Pessimism Bias

Do you always expect the worst, even when there’s no real reason to? That’s Pessimism Bias – the tendency to overestimate the likelihood of negative events, especially in people prone to depression.

Where it can show up


- Finance – fearing failure, someone avoids investing or starting a business, even when success is likely.
- Relationships – expecting betrayal or abandonment leads to unnecessary anxiety.
- Career & work – fear of failure stops people from taking new opportunities, even when risks are low.

A practical countermeasure


- Assess real probabilities – use facts, not emotions, to predict outcomes.
- Notice positive results – pessimists tend to overlook successful cases.
- Balance caution with action – considering risks is smart, but don’t let fear dictate your decisions.