The window of tolerance is a concept I find useful when assessing distress and helping clients understand what’s happening internally. The "window of tolerance" describes the optimal zone of arousal where an individual can function effectively. Within this window, we're able to think clearly, make rational decisions, and engage in healthy interpersonal relationships. The moment your feelings get too overwhelming, you’ve left the window of tolerance and things start to get ugly. This can manifest in various ways, such as heightened anxiety or emotional detachment.