Stuttering is neurological. It's brain structural disorder. It's not just "mental perception". Just as tinnitus, fibromyalgia and even depression. Stuttering gave me so many stress hours that I feel like war veteran with the age of 19. I developed huge stress, and that caused panic disorder and this gave me tinnitus and chronic pain and restless legs syndrome (tingling i the legs all day long). Stuttering is just awful.