Dysarthria is a speech sound disorder resulting from neurological injury of the motor component of the motor–speech system and is characterized by difficulty articulating phonemes (an indivisible unit of sound in a given language). In other words, it is a condition in which problems effectively occur with the muscles that help produce speech, often making it very difficult to pronounce words. It is unrelated to problems with understanding language (that is, dysphasia or aphasia), although a person can have both.