What Is Stimming, And Why It Should Never Be Stopped

Stimming is one of the most commonly misunderstood features of autism. In the school and therapy contexts I have worked in, it is often discussed as something to be reduced, redirected, or eliminated. In most cases, that is the wrong approach, and it is worth understanding why.

Stimming, short for self-stimulatory behaviour, refers to repetitive movements, sounds, or sensory activities that a person engages in to regulate their nervous system. Hand-flapping, rocking, spinning, tapping, humming, repeating words or phrases, fidgeting with objects, these are stimming behaviours, and they serve a genuine neurological function.

What stimming actually does

Stimming provides sensory input that helps regulate the nervous system. For an autistic nervous system that is frequently over- or under-stimulated by the environment, this self-generated sensory input provides either calming (for an over-stimulated system) or activation (for an under-stimulated one). It is, in effect, the nervous system's self-management tool.

When an autistic person stims more than usual, it is often a signal that their nervous system is working harder, that the environment is more demanding, that anxiety is higher, that the sensory load is greater. Increased stimming is a communication. It is telling you something. Stopping the stimming without addressing what is driving it does not remove the need for regulation, it removes the tool.

Stimming and masking

One of the most harmful outcomes of teaching autistic people to suppress stimming is the masking that results. A child who has been consistently discouraged from their natural regulatory behaviours does not stop needing regulation. They develop more hidden, more internal, often more exhausting ways of managing. The stimming goes underground. The regulatory need remains.

The research on outcomes from suppression of stimming is concerning. Studies link chronic suppression of natural autistic behaviours, including stimming, to elevated rates of anxiety, depression, burnout, and trauma in autistic people. The cost of appearing neurotypical is real and accumulates over time.

When is stimming a concern?

There are circumstances where a specific stim warrants attention: when it causes physical harm (head-banging, skin-picking that causes injury), when it prevents the person from engaging in activities they want to engage in, or when it is a signal of extreme distress that needs addressing at its source. In these cases, the goal is not to eliminate the stimming but to address the underlying need and provide alternative regulatory tools.

What schools should do

Schools that have policies against stimming, or teachers who consistently redirect or discourage natural stimming behaviours, are creating environments that are less safe and less regulated for autistic students, not more. Best practice is to allow stimming unless it is causing harm, to understand that a student who is stimming more than usual may be struggling, and to provide alternative regulation supports rather than removing the ones the student has developed.

What parents can do

Model acceptance of your child's stimming at home. Talk about it openly and positively: 'I notice you're rocking, that helps you, doesn't it.' Do not teach your child that their regulatory behaviours are shameful. If specific stims are problematic in certain public settings, you can discuss this with your child in a way that does not frame the behaviour as wrong, just as something that works better in some places than others. There is a difference between 'don't do that, it's weird' and 'you can do that at home or in the car, and here are some alternatives when we're in a place where it's harder.'