Dyslexia (/dɪslɛksiə/ ⓘ), previously known as word blindness, is a learning disability that affects either reading or writing.[1][6] Different people are affected to different degrees.[3] Problems may include difficulties in spelling words, reading quickly, writing words, "sounding out" words in the head, pronouncing words when reading aloud and understanding what one reads.[3][7] Often these difficulties are first noticed at school.[2] The difficulties are involuntary, and people with this disorder have a normal desire to learn.[3] People with dyslexia have higher rates of attention deficit hyperactivity disorder (ADHD), developmental language disorders, and difficulties with numbers See more