Currently, the medical community categorizes stuttering as a psychiatric disorder — just like they do schizophrenia and bipolar disorder.

Is stutter a mental disorder?

Stuttering is a psychological disorder. Emotional factors often accompany stuttering but it is not primarily a psychological (mental) condition. Stuttering treatment/therapy often includes counseling to help people who stutter deal with attitudes and fears that may be the result of stuttering.

Is stuttering a mental retardation?

Because stuttering in the mentally retarded is often similar to beginning forms of the disorder, indirect forms of treatment should be attempted. However, some mentally retarded stutterers develop more advanced forms of stuttering and may need help to reduce tense blocks and struggle behavior.