Paradoxical intention is a logotherapy technique for anxiety-driven physical symptoms: instead of trying to suppress or avoid a feared reaction, the person is instructed to deliberately and exaggeratedly try to produce it. This works because anticipatory anxiety about a symptom (sweating, stammering, a muscle cramp) is often what actually triggers or worsens it — removing the fear by replacing it with a deliberate, almost absurd goal breaks the anxious feedback loop that was sustaining the symptom in the first place.
The technique's speed is part of what makes it clinically notable: because it targets the anxiety-symptom feedback loop directly rather than an underlying unconscious cause, resolution can happen within days rather than the months or years typically associated with working through anxiety in other ways.
A young physician who suffered anticipatory anxiety about visibly sweating in social situations was instructed by Frankl to deliberately try to sweat as much as humanly possible whenever he feared an episode was starting — essentially daring his own body to prove how much it could produce. Within a single week, a phobia that had plagued him for four years was permanently resolved. In a separate case, a bookkeeper facing job loss over a severe writer's cramp was told to try to write as illegibly and messily as possible, showing off what a terrible scrawler he could be — once he tried to intentionally produce bad handwriting, he found he physically couldn't, and within 48 hours a cramp that years of other treatment hadn't touched was gone.