NEW YORK --A new study says there may be a genetic link to some cases of stuttering. The study says certain speech problems could be caused by mutations in three different genes. The study was released by the New England Journal of Medicine. It says stuttering tends to run in families. The true cause of stuttering is a medical mystery.
Over the years it's been blamed on a variety of causes, including emotional problems, stress, overbearing parents, and browbeating teachers.
The Associated Press contributed to this report.