People with Rett syndrome withdraw socially and recently scientists have found that up to 75% of patients are so anxious that a stress hormone called cortisol can be found in their urine.

• 患雷特氏症的人会对社交活动表现出抵制的情绪，同时最近科学家发现高达75%25的患者会非常焦虑以至于在他们的尿液中医生能检测到一种被称为cortisol的压力激素。