1, genetic factors: stuttering patients can have a family incidence rate of 36% to 55%, so some people think that it is related to genetic factors, and may be single gene inheritance. It has also been found that left handedness is more common in stuttering patients and their relatives, suggesting that stuttering is related to the dominant side of the brain.
2. Somatic factors: many children have been affected by harmful factors in perinatal or infant period, such as pregnant toxemia, bleeding or somatic diseases in the fetal period, or some infectious diseases in the process of development, which weakens the function of nervous system and causes stuttering due to the involvement of speech function.
3. Mental factors: children stuttering often occurs after acute or protracted mental trauma, so many theories believe that mental factors may be an important cause of stuttering. When children are frightened by terrible stories and movies, or because of family disharmony, parents’ improper way of discipline and rude attitude towards their children, their mental tension and depression will lead to stuttering. In addition, adults can not correctly deal with the phenomenon of children’s language learning stage is not fluent, it will make children speak too nervous, more tongue tied.
4. Other factors: some preschool children suffer from stuttering because of imitation. Children like to imitate, often because see others stuttering feel interesting and imitate, thus infected with stuttering. According to EEG, EMG and clinical efficacy of haloperidol. It is concluded that stuttering may be related to the increased activity of limbic system and reticular formation complex, uncoordinated function of articulation muscles, and biochemical disorders in basal ganglia, but it needs further clinical demonstration.