Developmental stuttering: Developmental stuttering occurs in young children while they are still learning speech and learning skills. It is the most common form of stuttering. It runs in families. Researchers isolated three genes that cause stuttering.
Neurogenic stuttering: Neurogenic stuttering may occur after a stroke, head trauma, or other type of brain injury. In neurogenic stuttering, the brain has difficulty coordinating the different components involved in speaking because of signaling problems between the brain and nerves or muscles.