Self-Injurious Behavior in Autism: What Helps

Few things are harder for a parent to watch than a child hurting themselves. If your autistic child bangs their head, bites their hand, or scratches their skin, you are not alone, and it is not your fault.

Self-injurious behavior in autism is more common than many families realize, and it almost always has a reason behind it. This guide explains what self-injurious behavior is, why it happens, and the calm, evidence-based steps that can help reduce it, while keeping your child safe today. We will also point you to New Jersey resources you can reach right now.

What Self-Injurious Behavior in Autism Looks Like

Self-injurious behavior (often shortened to SIB) means any action a person does to their own body that causes, or could cause, physical harm. In autism, it can take many forms, including:

Head banging against walls, floors, or furniture
Biting the hand, wrist, or arm
Hitting or slapping the head or face
Scratching, skin-picking, or rubbing the skin raw
Pinching, hair-pulling, or eye-poking

This is more common than families often expect. Research suggests that roughly half of autistic people engage in some form of self-injury at some point in their lives. Importantly, self-injury is not a defining feature of autism itself. It tends to show up alongside autism when communication is hard, sensory needs are unmet, or a child is in pain or distress and has no easier way to show it.

Why Self-Injurious Behavior Happens

Understanding self-injurious behavior in autism starts with one key idea: behavior is communication. Your child is not trying to be difficult. The behavior is doing a job for them. Behavior analysts usually find that self-injury serves one or more of these functions:

Escape or avoidance — getting out of a demand, a task, or an overwhelming situation.
Attention — bringing a caregiver close, even if the response is worried or upset.
Access to something wanted — a favorite item, food, or activity.
Sensory or internal relief — the behavior may feel regulating, or it may signal pain such as an earache, dental problem, headache, or stomach issue.

Medical causes deserve special attention. A sudden start or spike in head banging or face hitting can sometimes mean physical pain a nonspeaking child cannot describe. It is always worth a check-in with your pediatrician to rule out ear infections, dental pain, reflux, constipation, or seizures before assuming the cause is purely behavioral.

Find the Function Before You Change Anything

The single most effective step in reducing self-injurious behavior in autism is figuring out why it is happening for your child specifically. Two children can bang their heads for completely different reasons, and a strategy that helps one can make the other worse. That is why guessing is risky and assessment matters.

A Board Certified Behavior Analyst (BCBA) does this through a functional behavior assessment (FBA): they observe carefully, talk with you, and track what happens right before and right after the behavior to identify its purpose. From there, the team builds a plan matched to that function. You can learn more in our guides to what a functional behavior assessment is and understanding the ‘why’ behind biting and hitting.

At home, you can start your own simple ABC log: write down the Antecedent (what happened just before), the Behavior, and the Consequence (what happened after). Patterns often appear within a week or two, and that log is gold for your child's team.

Reducing Self-Injurious Behavior With a Replacement Skill

You cannot simply remove a behavior that is meeting a real need. The goal is to give your child a safer, easier way to get the same result. This is the heart of reducing self-injurious behavior in autism, and it is where ABA therapy is especially effective.

One of the most evidence-backed approaches is functional communication training (FCT): teaching your child a quick, reliable way to communicate the need that the self-injury was expressing. Depending on the function and your child's communication style, that might be:

A picture card, sign, or word for ‘break,’ ‘help,’ or ‘all done’ (escape)
A way to request attention, like tapping a parent or showing a ‘come here’ card
A request for a wanted item using manding skills or AAC
A sensory replacement, such as a chew tool or deep-pressure activity, for self-stimulatory functions

Pair this with generous positive reinforcement every single time your child uses the new skill, so it becomes faster and more rewarding than the old behavior. Replacing rather than just suppressing is what makes the change last.

Preventing Episodes and Responding Calmly

Alongside teaching new skills, small environmental changes can lower how often self-injury happens in the first place:

Adjust the antecedents. If demands trigger it, break tasks into smaller steps, offer choices, and use a first-then approach so expectations are clear.
Reduce sensory overload. Lower noise, dim bright lights, and build in breaks before your child reaches the breaking point.
Use visual supports. Predictability calms anxiety; visual schedules help your child see what is coming next.
Stay calm and safe in the moment. A big emotional reaction can unintentionally reinforce attention-seeking behavior. Keep your voice low, protect your child from harm (cushions, blocking without grabbing), and avoid lecturing during an episode.

If the behavior is intense or could cause serious injury, do not try to manage it alone with internet tips. A behavior plan for significant self-injury should always be designed and supervised by a qualified BCBA who can keep both your child and your family safe.

When and How to Get Professional Help

Reach out to professionals if self-injury is frequent, escalating, causing visible harm such as bruising or broken skin, or starting suddenly out of nowhere. Start with two calls: your pediatrician (to rule out a medical cause) and a quality ABA provider for an assessment.

Autumn ABA provides in-home ABA therapy across all 21 New Jersey counties, which means your child's BCBA can observe and treat self-injurious behavior in the real settings where it happens, not just a clinic room. In-home work also lets us coach you directly so the strategies hold up at the dinner table and at bedtime. You can read about in-home versus center-based ABA to weigh the options, and when you are ready, our get started page walks you through intake. We serve families statewide; see our locations for your area, and browse more parent guides in our resource library.

New Jersey Crisis and Support Resources

If your child's self-injury becomes a crisis, New Jersey families have help available right away:

Life-threatening emergency: Call 911 or go to the nearest emergency room.
PerformCare / Mobile Response and Stabilization Services (MRSS): Call 1-877-652-7624, available 24/7. Trained responders can come to your home, often within an hour, to help stabilize a behavioral crisis and connect you to follow-up support for children up to age 21.
Autism New Jersey Helpline: Call 800.4.AUTISM for guidance on services, treatments, and providers across the state.

It helps to prepare before a crisis happens. Some NJ families introduce their child to local police and EMS in advance and keep the PerformCare number posted on the fridge. You can also reach Autumn ABA directly at 732-664-0038 or visit us at 5 Professional Cir, Colts Neck, NJ 07722 to talk about getting an assessment started.

Frequently asked questions

Is self-injurious behavior a normal part of autism?

Self-injury is not a core feature of autism, but it is common among autistic people, especially when communication is difficult or sensory and medical needs go unmet. It almost always has an identifiable reason, which means it can usually be reduced with the right support.

Should I ignore my child when they hurt themselves?

No. Never ignore behavior that could cause physical harm. The safe approach is to protect your child from injury, stay calm to avoid accidentally reinforcing the behavior, and work with a BCBA to teach a safer replacement skill. A trained professional should guide any plan for serious self-injury.

Could my child's head banging be caused by pain?

Yes, it is possible. A sudden increase in head banging or face hitting can sometimes signal pain a nonspeaking child cannot describe, such as an ear infection, dental problem, headache, reflux, or constipation. Always check with your pediatrician to rule out medical causes.

How can ABA therapy help with self-injurious behavior?

A BCBA first conducts a functional behavior assessment to find why the behavior happens, then teaches a safer way to meet that same need, often through functional communication training, and reinforces the new skill consistently. In-home ABA lets the team treat the behavior where it actually occurs.

What do I do if my child's self-injury becomes a crisis in New Jersey?

For a life-threatening emergency, call 911. For an urgent behavioral crisis, call PerformCare Mobile Response at 1-877-652-7624, available 24/7, and responders can come to your home. For general guidance, the Autism New Jersey Helpline is 800.4.AUTISM.

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Understanding and Reducing Self-Injurious Behavior in Autism