Cluttering is a fluency disorder characterized by a rapid and/or irregular speaking rate, excessive disfluencies like filler words and revisions, and sometimes other issues like language errors or attention deficits. It differs from stuttering in that people who clutter often do not know what they want to say or how to say it clearly. They speak too fast or in a jerky manner with improper pauses. Treatment involves speech therapy to help reduce speaking rate, improve self-monitoring of speech, and practice careful enunciation. While the cause is unknown, it may involve abnormal brain development affecting speech rate control and language planning.