Stuttering is a language fluency disorder, and stuttering is a series of reactions caused by difficulty in speaking or premonition of difficulty in speaking, which can be divided into the main performance and accompanying performance.1. Main performance: It may be manifested as a struggle to speak or inability to say a complete sentence. There may be a decrease in the ability to express language when speaking to strangers due to tension or stress in the heart, and there may be targeted pauses in speech or a prolongation of individual words. There may be excessive repetition of individual words or words when speaking, and there may be lengthening of consonants and vowels. In addition, there may be rapid breathing before speaking, or the insertion of meaningfully unwanted sounds, words, phrases, etc. throughout the sentence. 2. Accompanying manifestations: Usually refers to tension in a body part or the whole body to overcome stuttering, and unnecessary movements, such as the appearance of clenched fists, stiffness, slapping the face or body with the hands, kicking the ground with the feet, and other manifestations. The face may show signs such as open nostrils, puffed cheeks, wide eyes, blinking, closed eyes, and gagging. In addition, the neck may move forward, backward, or sideways, and the trunk may bend forward, tilt backward, or sit unsteadily.