Anxiety naturally rises when you face something feared, then falls on its own as your nervous system habituates — provided you stay in the situation long enough. Avoidance short-circuits this process: it reduces anxiety immediately, which feels like relief, but that relief reinforces avoidance behavior and prevents your nervous system from learning that the situation is survivable. Over time, avoided situations trigger more anxiety, not less. Exposure therapy works by allowing habituation to complete — staying with discomfort until anxiety decreases on its own, which teaches your brain a new association: feared situation → tolerable → safe.