Itch is a sensation that provokes a desire to scratch.The scratching behavior has already been used as an objective indicator to evaluate pruritus in animal model and patients.

• 瘙痒是一种引起搔抓刺激部位欲望的感觉，搔抓行为已被用于评价实验动物的瘙痒和作为临床观察瘙痒的客观指标。