Feeling like a fraud

A key factor why Impostor Syndrome and burnout overlap is that Impostor Syndrome shows up in a similar way to the third dimension of burnout - the feeling of professional inefficacy.

When you are experiencing burnout, you never feel you are doing enough. You feel like the ineffective person on the team. This is very similar to the definition of imposter syndrome.

With IS, people develop tactics to compensate for or mask their impostorism, such as taking on too much work to win approval or avoiding promotion because they fear exposure.