ADHD stimming (self-stimulatory behavior) is when a person with attention deficit hyperactivity disorder unconsciously repeats certain movements or sounds. Some ADHD stimming examples include humming, pacing, teeth grinding, and rocking, though there are many others.
The reasons for stimming can vary depending on the person and environment. It's thought that, in ADHD, these behaviors may come from a need to improve focus, self-soothe, or channel energy, according to Children and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD).
Stimming is normal in ADHD, but can be problematic if it disrupts everyday functioning or results in self-harm or injury. Medication, self-control techniques, and environment changes may help. Read more in Verywell.