Imposter syndrome is usually low self-esteem at work
Success gets attributed to luck. The fear of being found out grows with every promotion. Imposter feelings are the workplace face of a belief that was formed long before the job.
You got the job. Then the promotion. Then the project everyone wanted. And each time, rather than feeling more secure, you felt more exposed. The gap between how you are seen and how you see yourself is widening, and the fear of being found out grows with every step up. At some point, you are sure, someone will look properly and realise you should never have been here.
This has a name, imposter syndrome, and the name is useful up to a point. What it misses is that imposter feelings are usually low self-esteem showing up in the one place where you are regularly evaluated, and rarely about the work itself.
The attribution trick
The signature of imposter feelings is what happens to success. It arrives, and it gets reassigned. Luck. Timing. The team. Somebody's oversight. They were being generous. You happened to know the answer. The one success that cannot be explained away is filed as a fluke that will not be repeated.
Failure, meanwhile, is attributed straight to you, and stored. Over years this produces a strange ledger: a career full of achievements, none of which count, and a handful of mistakes, all of which do. The belief that you do not belong is never disproved, because the evidence that would disprove it is never allowed in.
This is the sorting mechanism at the centre of low self-esteem, and it operates the same way in a boardroom as it does in a relationship. Work is the arena, not the cause.
Why it gets worse with success
People expect imposter feelings to ease as the evidence piles up. They often get worse, and there is a logic to it. Each promotion raises the stakes of being found out. Each success that gets reassigned adds to the sense of an unearned position. And the higher you go, the fewer people there are to reassure you and the more there are to evaluate you. If the bottom-line belief is "not good enough", success makes the eventual exposure feel bigger rather than challenging it.
The rules that keep you safe
Around the belief there are rules, and at work they are visible. Over-prepare for everything. Never ask a question that might reveal a gap. Work longer than anyone else. Never say no. Do not put yourself forward for the thing you might not get. Each rule protects you from the moment of being found out, and each prevents you from ever discovering that you would not have been. They are also exhausting, and they are often the reason talented people burn out or stay below what they can do.
What the work involves
The CBT model for low self-esteem treats imposter feelings as a belief that was learned and is being protected. We make the structure visible: the bottom-line belief, the rules on top of it, the predictions before anything difficult, the interpretation afterwards. Then we open the system with evidence rather than argument.
A deliberate record of the evidence you normally discard, kept for weeks, because the discarding is the mechanism. Behavioural experiments that test the rules: what actually happens if you ask the question, put yourself forward, stop over-preparing for one meeting. Work on the self-critical voice and where it came from, because the imposter feeling at forty usually has an origin long before the first job. Where the belief was laid down by something specific, EMDR can take the charge out of the memory that still proves it.
Not the same as identity OCD
Imposter feelings are situational and about competence, and they respond to evidence, slowly, once the evidence is allowed in. There is a related but different pattern in which the doubt is about character rather than capability, never eases, and re-examines every piece of evidence in your favour until it stops counting. That is an obsessional theme, identity OCD, and it is treated differently. Assessment tells the two apart.
What changes
Progress shows up in what you are willing to attempt before it shows up in how you feel. People apply for the role, ask the question, decline the extra work, weeks before they would say their confidence has improved. The goal is an accurate and stable view of yourself, not a conclusion that you are brilliant: being able to hold a mistake without it becoming a verdict, and being able to let a success count.
If the fear of being found out has followed you up every rung, there is more on how I treat low self-esteem, and the workplace is usually where we gather the first evidence.