While the exact cause is still being actively researched, we can confidently say that stuttering is neurophysiological condition or difference with a strong genetic component that can be impacted by a variety of factors related to language, motor, speech, temperament, and environment. It is important to note that stuttering is not caused by nervousness or anxiety, as individuals can be at their most relaxed state and still stutter on every word. It is also not possible to ‘catch’ stuttering, as it is not something that is learned through imitation.