ADHD stimming, or self-stimulatory behavior, is a common symptom of Attention Deficit Hyperactivity Disorder. It is a type of repetitive behavior, such as hand-flapping, twirling or rocking, that can help relieve stress. It is often used as a coping mechanism for people with ADHD and can also help them focus on a task. Other common examples of ADHD stimming include fidgeting, chewing on objects, tapping surfaces or making noises. These behaviors are not necessarily problematic, although they can become disruptive if they interfere with a person's day-to-day functioning.