There may also be unusual facial and body movements associated with the effort to speak. Almost all children go through a stage of frequent nonfluency in early speech development.
Most people use the terms interchangeably.
We still do not know for a fact what causes stuttering. It may have different causes in different people, or it may occur only when a combination of factors comes together. It is also quite possible that what causes stuttering is quite different from what makes it continue or get worse. Children who stutter are no more likely to have psychological problems than children who do not stutter. In general, there is no reason to believe that emotional trauma causes stuttering.