There are disorders of language like aphasia.

有失语症等语言障碍。

There's other disorders of language such as receptive aphasia where the person could speak very fluently but the words don't make any sense and they can't understand anybody else.

还有其他语言障碍，例如接受性失语症，患者可以非常流利地说话，但这些词没有任何意义，也听不懂其他人的意思。