Autism regression around aged 9-18 years old – is it catatonia?

 

From the title of today’s post you can see that this is one for parents of older children and indeed some adults. I should add that personally I am not a fan of observational diagnoses like catatonia, because I am interested in the biological cause of the unwanted behaviors, as a means to find effective therapy. Catatonia is a very broad term, but in current psychiatry that is what we have.

I was recently contacted by a mother whose adolescent son had regressed severely and she wanted to know what she had done wrong. She had not done anything wrong of course. Now she has to figure out what triggered the changes and how to reverse them. Catatonia is one possibility and it has not been covered in this blog.

The word catatonic drifted into casual English. Today, people use it informally to describe anyone who is completely unresponsive, frozen, or motionless.

As a medical term a diagnosis of catatonia is typically confirmed when an individual displays three or more of the following features:

Stupor & Mutism. Profound unresponsiveness to the outside world, along with a lack of, or severely reduced, speech.

Catalepsy & Waxy Flexibility. The tendency to passively hold bizarre, fixed postures against gravity or to maintain a position exactly as it is set by someone else.

Negativism. An active or passive resistance to instructions or movement.

Posturing. The spontaneous holding of unnatural, active postures for long periods.

Stereotypy & Mannerisms. Repetitive, non-goal-directed movements (such as rocking or pacing) or odd caricatures of normal actions.

Excitement/Agitation. Frenzied or purposeless motor activity that does not seem influenced by external stimuli.

Echolalia & Echopraxia. The involuntary mimicking of someone else's speech or movements.

 

Catatonia often occurs in people with schizophrenia, bipolar, or major depressive disorders. It can also be triggered by autoimmune diseases, brain injuries, or even severe infections. About 10% of people with autism will develop symptoms of catatonia. It can affect any level of autism.

Puberty can be the trigger for catatonia, but it can also develop much later in adulthood. 

Diagnosing catatonia looks different depending on the patient's age. For instance children are much more likely to present with refusal to eat or drink and mutism, which caregivers sometimes mistake for stubbornness or behavioral issues.

Autism-related catatonia can manifest differently than it does in non-autistic populations. It is often characterized by a distinct pattern of gradual, late regression rather than a sudden, acute physical freeze.

The "Late Regression" Timeline

While autism is usually diagnosed in early childhood, catatonia typically hits during adolescence or early adulthood.

The Early Warn Signs (Ages 10–14) Before full-blown catatonia develops, young teens with autism often exhibit a gradual increase in obsessive-compulsive routines, extreme physical slowness, or brief episodes of "freezing".

Full Onset (Ages 15–19) Full-syndrome catatonia typically solidifies during the peak of pubertal development. It is rare to see the full syndrome in autistic children under the age of 15.

Unique symptoms in autistic individuals

Because symptoms overlap with common autistic traits, catatonia can be difficult to recognize.

Loss of Function (Severe Regression). A sudden or progressive inability to complete daily activities they previously mastered (e.g., getting dressed, bathing, or using utensils).

Severe "Freezing" and Stuckness. Getting physically stuck mid-motion—such as freezing in a doorway or holding a cup halfway to their mouth for minutes.

The "Shutdown" Phenomenon. Severe passivity where the individual stops talking (mutism), avoids all eye contact, and refuses to eat or drink.

Hyperactive and Self-Injurious Behaviors. Rather than just freezing, autistic individuals frequently display hyperactive catatonia, which includes repetitive, automatic, and severe self-injury (like severe head-banging) that is unrelated to communicative distress.

Fluctuation Symptoms are notoriously variable—an individual may seem heavily affected or locked in place in the morning but move relatively normally by evening.

 

Why does it happen?

In autism, catatonia is frequently triggered by extreme environmental stress, major life transitions (like leaving school), trauma, severe anxiety, or co-occurring mood disorders.

 

Biological drivers

While psychological and environmental stress (such as extreme anxiety, bullying, or major routine changes) frequently act as the spark, catatonia is ultimately a neurological breakdown. The primary biological triggers, chemical imbalances, and genetic factors that cause the brain to enter a catatonic state include:

1.     Neurotransmitter imbalances

The most widely accepted biological explanation for catatonia is a sudden, severe imbalance of chemical messengers in the brain circuits that control movement and behavior:

·        GABA Deficit: GABA is the brain's primary calming/inhibitory neurotransmitter. In catatonia, there can be a sudden drop in GABA-A receptor activity. Because the brain loses its ability to regulate or slow down signals, motor pathways lock up. This explains why benzodiazepines (which increase the sensitivity to a given amount of GABA) can often rapidly reverse the condition.

·        Glutamate Overdrive: Glutamate is an excitatory chemical. A spike in glutamatergic activity, specifically involving NMDA receptors, can overstimulate the brain's motor networks, forcing the body into fixed, rigid postures.

·        Dopamine Drop: A sudden drop in dopamine activity—specifically at D2 receptors—paralyzes the brain’s reward and movement centers. This mimics the chemical state seen in Parkinson's disease, creating severe physical slowness or total immobility.

 

2.     Neuroimmune and autoimmune triggers

The immune system can directly attack the brain, causing acute neuroinflammation that triggers catatonia.

·        Autoimmune Encephalitis: Conditions like anti-NMDA receptor encephalitis occur when the body mistakenly produces autoantibodies that attack NMDA receptors in the brain. Catatonia is a primary symptom in up to 70% of these cases.

·        Systemic Infections: In medically vulnerable or autistic individuals, severe underlying infections (like a urinary tract infection, pneumonia, or a severe viral illness) can trigger a massive cytokine response. This inflammation breaches the blood-brain barrier, disrupting motor circuits and inducing catatonic behavior.

 

3.     Structural brain differences

Neuroimaging studies show that catatonia often stems from communication failures within specific brain loops (the cortico-striato-thalamo-cortical circuits) which govern motor planning.In autistic individuals with catatonia, MRI scans frequently reveal abnormally small cerebellar structures. Because the cerebellum is responsible for fine-tuning motor actions and smooth coordination, these structural differences make the motor loop highly vulnerable to completely breaking down under stress.

4.     Genetic susceptibility

Catatonia can have a hereditary link. Genetic studies on families with a vulnerability to periodic catatonia have identified specific genetic alterations. Interestingly, susceptibility regions on chromosomes 15 and 22 are heavily implicated in both autism and catatonia, suggesting a shared genetic architecture that primes certain individuals for the condition.

5.     Medication effects & withdrawal

Abrupt biological shifts caused by pharmaceutical substances can paralyze the motor system:

·        Dopamine Blockers: Exposure to strong antipsychotic medications can sometimes block dopamine receptors so aggressively that it induces catatonia .

·        Sedative Withdrawal: Suddenly stopping medications that calm the central nervous system (such as benzodiazepines or barbiturates) causes a rebound biological shock, stripping away the brain’s chemical brakes and inducing a catatonic freeze. Always taper the dosage.

  

Mainstream therapy for catatonia 

The treatment goal is to resolve any physical freezing first, then address the underlying psychiatric or medical cause.

Clinicians use a strict, stepped protocol ranging from medications to medical procedures. The first-line medication is Lorazepam (Ativan), a benzodiazepine. Lorazepam increases GABA-A activity, restoring the brain's missing chemical brakes. Intravenous Lorazepam is given to confirm the diagnosis if symptoms improve rapidly.

Electroconvulsive therapy (ECT) is the definitive treatment for severe cases. ECT is deployed if a patient shows no improvement after intensive Lorazepam trials. ECT is performed safely in a hospital setting under general anesthesia and muscle relaxants.

Maintenance Therapy: Long-term, periodic ECT may be required for individuals with chronic conditions.

Second-line options include glutamate antagonists like Amantadine or Memantine, if first-line choices fail. Alternative GABA agents like Zolpidem (Ambien) are sometimes utilized to break treatment-resistant freezing. Medications to Avoid: Traditional dopamine-blocking antipsychotics (like haloperidol) are generally not useful. Antipsychotics can worsen the motor paralysis or trigger Neuroleptic Malignant Syndrome.

 

Peter’s thought’s on mainstream therapy

The 30+% of level 3 autism who respond to bumetanide would have an extreme negative (paradoxical) reaction to Lorazepam (Ativan). They would get very aggressive and “go nuts.”

In most countries ECT is highly regulated. It clearly is effective for some people, but it looks a rather crude therapy to me.

The mainstream therapies look very “thin” to me. I think much more should be possible.  

I think the term catatonia is much too vague and you need to know why these changes have occurred, then you can figure out a therapy.

PANS can trigger the symptoms of catatonia. In many counties PANS is still not recognized as a diagnosis. PANS (Pediatric Acute-onset Neuropsychiatric Syndrome) would not respond to a benzodiazepine drug like Lorazepam, but would instead require immunotherapy, which is completely different.

As usual we come back to getting an observational like catatonia, autism or trendy new ones like ARFID (picky eating) is just the first step in the process. Then you need to find out why? What biological or behavioral factors are driving these symptoms. Then you can figure out how to treat them, or indeed choose not to treat them, if you are so inclined.

  

Could it be OCD rather than catatonia?

One reason catatonia can be difficult to recognize in autism is that several of its symptoms overlap with severe obsessive-compulsive disorder (OCD). In fact, some studies have found that obsessive-compulsive symptoms are very common in autistic individuals who later develop catatonia.

Parents often report that their child begins:

• Writing the same words repeatedly
• Talking about the same topics over and over
• Performing increasingly rigid rituals
• Becoming distressed when routines are interrupted
• Withdrawing socially

These symptoms may point to OCD, catatonia, or a combination of both.

The key distinction is that OCD is driven by obsessions and compulsions, whereas catatonia is characterized by a loss of initiative and a decline in function. An autistic teenager with OCD may be extremely active in performing rituals, while a teenager with catatonia may become progressively slower, less spontaneous, and increasingly "stuck."

Questions that may help distinguish the two include:

• Does the person become anxious if prevented from performing the behavior?
• Are they physically slower than before?
• Do they need prompting to start everyday activities?
• Have they lost skills they previously mastered?
• Are they spending long periods inactive or frozen?

The two conditions can coexist. In some cases, severe OCD may precede the development of catatonia.

Investigations

When a child, teenager, or adult with autism experiences a significant regression after years of relative stability, it is worth looking beyond the autism diagnosis itself.

One investigation I would seriously consider is an EEG (electroencephalogram). Epilepsy or "just" abnormal electrical activity in the brain can sometimes present as:

• Regression
• Social withdrawal
• Changes in communication
• Cognitive decline
• Repetitive behaviors
• Episodes of staring or unresponsiveness

Several studies have reported higher rates of epilepsy among autistic individuals who develop catatonic symptoms.

An EEG may not identify the cause of the regression, but it is a relatively straightforward way to investigate an important and potentially treatable neurological contributor.

Other investigations may include:

• Sleep assessment
• Review of medications
• Assessment for OCD and anxiety disorders
• Evaluation for depression
• Screening for autoimmune or inflammatory conditions where clinically indicated

The important point is that autism itself is not usually a progressive condition. When someone loses skills after years of stability, it is worth asking what has changed and whether there is a treatable condition contributing to the decline.