Speech problems occur when one has difficulty with pronunciation of words, and even the overall intelligibility of speech in conversation. When a child has difficulty forming a sound, this is called an articulation disorder or phonological disorder. Individuals with speech disorders may also have trouble with the way their voices sound. There may be difficulties with pitch, volume, or quality of the voice. Another type of voice disorder occurs when there is an interruption in the flow of speech, called disfluency or stuttering. Children suffering from speech disorders may have one or more of these difficulties.