PANS or PANDAS? What the distinction is, and when it changes the plan

Your child was fine in October. By the middle of November he was washing his hands raw. He would not stay in a room alone. He was wetting the bed again. And he was screaming at a volume you had never heard from him. Someone said the word PANDAS. Someone else said PANS. Nobody explained the difference.

Here is the difference, in plain language. And here is what knowing it does and does not tell you.

What do parents ask me most about this?

Short answers first. The full reasoning is below.

What is the difference between PANS and PANDAS?

PANDAS is one part of PANS. PANS is the wider category. It describes a sudden, dramatic onset of obsessive-compulsive symptoms or severely restricted eating, plus other new symptoms.

How do PANDAS and PANS compare, side by side?

PANDAS and PANS differ on three things. What has to be present. What the trigger has to be.

How is PANDAS defined?

PANDAS is defined by five working criteria, and all five have to be met. Obsessive-compulsive disorder and/or a tic disorder.

How is PANS defined?

PANS is defined by three criteria. First, abrupt and dramatic onset of obsessive-compulsive disorder or severely restricted food intake.

Where did this idea come from in the first place?

The idea came from Sydenham chorea. That is a movement disorder that can follow a strep infection. The antibodies the body raises against the bacteria also react with the child's own brain tissue.

What do these children actually look like at home?

They look far sicker than an obsessive-compulsive checklist suggests. They also look sick in the body, not only in the mind.

When does the distinction actually change anything?

The distinction changes what gets looked for and who gets involved. It does not turn a child into a protocol.

What does the distinction not tell you?

The distinction does not tell you the cause, and it does not tell you what will happen next.

What is the difference between PANS and PANDAS?

PANDAS is one part of PANS. PANS is the wider category. It describes a sudden, dramatic onset of obsessive-compulsive symptoms or severely restricted eating, plus other new symptoms. PANDAS is the older and narrower description, and it requires a link to strep. Every child who fits PANDAS fits PANS. The reverse is not true.

PANS stands for pediatric acute-onset neuropsychiatric syndrome. PANDAS stands for pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections. PANDAS was described first, in 1998, in a group of 50 children.1 The broader PANS category came later. A consensus conference in 2013 set out how it should be defined and evaluated.2

The 2025 American Academy of Pediatrics clinical report uses PANS as the umbrella condition. It describes PANDAS as now considered by many to be a subset of the larger spectrum of infection-induced acute-onset neuropsychiatric symptoms.3

So the two words are not competing labels. One sits inside the other. If someone has used both about your child, they may not have been contradicting each other at all.

How do PANDAS and PANS compare, side by side?

PANDAS and PANS differ on three things. What has to be present. What the trigger has to be. And how wide the category is. Everything else about the two descriptions overlaps heavily. The table below sets them next to each other, using the published criteria for each one.

What the letters stand for

PANDAS: Pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections

PANS: Pediatric acute-onset neuropsychiatric syndrome

First described

PANDAS: 1998, in a series of 50 children1

PANS: Criteria set out at a 2013 consensus conference2

Core symptom required

PANDAS: Obsessive-compulsive disorder and/or a tic disorder1

PANS: Abrupt, dramatic onset of obsessive-compulsive disorder or severely restricted food intake2

Other symptoms required

PANDAS: Neurological abnormalities, such as motoric hyperactivity or choreiform movements1

PANS: Symptoms from at least two of seven categories, with similarly severe and acute onset2

Age at onset

PANDAS: Before puberty1

PANS: No prepubertal requirement in the criteria2

Trigger required

PANDAS: Yes. A link to group A strep infection1

PANS: No specific trigger required. Other causes must be ruled out first2

Course

PANDAS: Episodic. Relapsing and remitting1

PANS: Course is not part of the defining criteria2

How they relate

PANDAS: A subset3

PANS: The umbrella category3

How is PANDAS defined?

PANDAS is defined by five working criteria, and all five have to be met. Obsessive-compulsive disorder and/or a tic disorder. Onset before puberty. An episodic course, meaning symptoms come in waves rather than building slowly. A link to group A strep infection. And a link to neurological abnormalities.1

In the original series of 50 children, onset was acute and dramatic. Tics started at an average age of 6.3 years. Obsessive-compulsive symptoms started at 7.4 years. Those 50 children had 144 separate flares between them. A documented strep infection came with 31% of those flares. Another 42% came with a sore throat or cold symptoms, where no throat culture was taken.1

That last figure is worth sitting with. Even in the group that defined the condition, most flares did not arrive with a confirmed strep test attached. If your child's timeline looks messy, that is not evidence you are imagining it.

How is PANS defined?

PANS is defined by three criteria. First, abrupt and dramatic onset of obsessive-compulsive disorder or severely restricted food intake. Second, other neuropsychiatric symptoms with a similarly severe and sudden onset, from at least two of seven categories. Third, symptoms that are not better explained by a known neurologic or medical disorder.2

Here are the seven categories. Anxiety. Emotional lability or depression. Irritability, aggression or severely oppositional behavior. Behavioral or developmental regression. Deterioration in school performance. Sensory or motor abnormalities. And somatic signs and symptoms, including sleep disturbance, bedwetting or urinary frequency.2

Read that list again and notice what is on it. Bedwetting. Handwriting falling apart. A child who suddenly cannot be in a room alone. Those are the symptoms parents apologize for mentioning, because they sound like behavior. They are on the published criteria list. Those aren't small things.

Where did this idea come from in the first place?

The idea came from Sydenham chorea. That is a movement disorder that can follow a strep infection. The antibodies the body raises against the bacteria also react with the child's own brain tissue. PANDAS was built on that model. The brain region in question is the basal ganglia, which handles movement, habit and repetition.

The AAP clinical report calls the cause of PANS unknown. It says the condition is theorized to be triggered, in some cases, by a recent infection or by autoimmunity, much like Sydenham chorea and autoimmune encephalitis.3

Separate work on a different post-infectious syndrome looked for antibodies against human basal ganglia tissue. It found them in 95% of affected patients. It found them in only 2% to 4% of controls.4 That is the kind of result that keeps the autoimmune idea alive.

I want to be careful about how far I take that. Theorized is the accurate word. It is a serious, published idea with real work behind it. It is not a settled mechanism.

What do these children actually look like at home?

They look far sicker than an obsessive-compulsive checklist suggests. They also look sick in the body, not only in the mind. One review covered the first 47 patients seen at a dedicated PANS clinic. Sleep disturbance was present in 84%. Urinary issues in 58%. Sensory amplification in 66%. Generalized pain in 68%. Gut symptoms in 42%.5

The same review recorded a relapsing and remitting course in 84%, violent outbursts in 61%, and suicidal thoughts or gestures in 44%.5 I put that last number here on purpose. If your child is talking about hurting himself or anyone else, that is an emergency. It goes to your pediatrician, to your local emergency department, or to 988 right now. It does not go into a queue for a functional medicine intake.

For everything short of that, here is the honest picture. Sleep, bathroom, pain and eating are part of the presentation. They are not side issues. The sleep piece in particular gets set aside as separate when it is not, and natural sleep remedies for kids covers that ground more fully.

When does the distinction actually change anything?

The distinction changes what gets looked for and who gets involved. It does not turn a child into a protocol. If the picture fits PANDAS, strep becomes the specific thread to follow, including in family members. If the picture fits PANS more broadly, the search widens. Other infections and other explanations stay on the table.

It also changes what a normal test means. A child can meet PANS criteria with no strep anywhere in the story. Chasing strep in that child is the wrong search. And a clean strep test in that child rules out very little. Getting the category right is what stops a family spending six months looking under the wrong streetlight.

In my own practice, the markers I look at in this picture are the Neural Zoomer, along with strep, mycoplasma and Epstein-Barr virus titers. Those show me whether there is evidence of prior streptococcal involvement, active Epstein-Barr reactivation, or ongoing neuroimmune activation. They are pieces of a picture that a clinician reads next to the history. No panel makes this diagnosis. I will say that again in a moment, because it matters more than anything else on this page.

What does the distinction not tell you?

The distinction does not tell you the cause, and it does not tell you what will happen next. Neither PANS nor PANDAS has a disease-specific biomarker. There is no blood test that settles it. The 2025 AAP clinical report says the condition lacks disease-specific biomarkers, strong evidence for pathogenic causes, and consensus on treatment.3

The same authors published their work as a report rather than a clinical practice guideline. They said plainly that the present level of evidence would not support graded recommendations.3 That is an unusual thing for a body like the AAP to say out loud, and it tells you where the field really is.

There are open questions too, and you deserve to hear them from me rather than find them later. A Canadian paediatric review concluded that definitive proof of the autoimmune hypothesis of PANDAS is lacking. It found that questions about diagnosis, treatment and cause remain unresolved.6 A separate study followed 715 children with chronic tic disorders across nine countries. It found no significant link between group A strep exposure and tic flares.7 That study looked at chronic tic disorders, not at sudden-onset PANS, so it does not close the question. It does show why careful researchers are still arguing.

So here is the honest position. These are clinical descriptions, arrived at by a clinician looking at a child and a timeline. They are not a lab result. Anyone selling you a panel that settles it is selling something that does not exist.

What will I not claim about PANS or PANDAS?

I will not claim to treat, cure or reverse PANS or PANDAS. There is no FDA-approved treatment for either one. Any protocol described as making this go away is describing something that has not been established. I am not going to be one more person telling you that in a hard year.

Published clinical management guidance does exist. In 2017 the PANS Research Consortium issued a three-part set of recommendations. They cover psychiatric and behavioral care, immunomodulatory therapy, and the treatment and prevention of infections.8 Those decisions sit with your child's physician team. A systematic review of the treatment literature also found that rigorous research is scarce and that published studies carry a high risk of bias.6 That is the state of the evidence. It is not what anyone wants to hear, and it is what is true.

What I do is narrower, and I can describe it without overselling it. I look at the whole child, in order. I look for the body-level loads that are making an already hard thing harder. That is the same work described in what a natural pediatrician does. It sits alongside your child's medical team, not in place of it.

You are not making this up. A child who changes this fast, and this completely, in a matter of days is telling you something. You were right to notice it and right to keep asking. Knowing which word applies will not fix the week you are having. What it does is give you a real map instead of guesswork. It gives you a specific question to bring to the next appointment, instead of a vague worry nobody knows what to do with. You did not cause this. And you are not the only family in Omaha sitting up at night reading about it.

If this is where you are, the next thing to read is my page on PANS and PANDAS care. It goes further into how a sudden-onset picture gets worked through. If you are newer to this whole way of looking at children, start instead with pediatric functional medicine in Omaha.

Written by Dr. Amy Patton, Founder Happy Kid Functional Medicine

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About the author

This article was written by Dr. Amy Patton, DNP, APRN, CPNP-PC, FMACP, a board-certified pediatric nurse practitioner and functional medicine provider serving Omaha-area families through Happy Kid Functional Medicine. Dr. Patton specializes in root-cause pediatric care for children's gut health, sleep, behavior, nutrition, immune patterns, and whole-child wellness. She sees patients in person in Omaha and by telehealth across Arizona, Colorado, Iowa, Nebraska, Tennessee, and Virginia.

References

1. Swedo SE, Leonard HL, Garvey M, et al. Pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections: clinical description of the first 50 cases. Am J Psychiatry. 1998;155(2):264–271. PubMed

2. Chang K, Frankovich J, Cooperstock M, et al. Clinical evaluation of youth with pediatric acute-onset neuropsychiatric syndrome (PANS): recommendations from the 2013 PANS Consensus Conference. J Child Adolesc Psychopharmacol. 2015;25(1):3–13. PubMed

3. American Academy of Pediatrics. Pediatric acute-onset neuropsychiatric syndrome (PANS): clinical report. Pediatrics. 2025;155(3):e2024070334. PubMed

4. Dale RC, Church AJ, Surtees RA, et al. Encephalitis lethargica syndrome: 20 new cases and evidence of basal ganglia autoimmunity. Brain. 2004;127(Pt 1):21–33. PubMed

5. Frankovich J, Thienemann M, Pearlstein J, Crable A, Brown K, Chang K. Multidisciplinary clinic dedicated to treating youth with pediatric acute-onset neuropsychiatric syndrome: presenting characteristics of the first 47 consecutive patients. J Child Adolesc Psychopharmacol. 2015;25(1):38–47. PubMed

6. Wilbur C, Bitnun A, Kronenberg S, et al. PANDAS/PANS in childhood: controversies and evidence. Paediatr Child Health. 2019;24(2):85–91. PubMed

7. Martino D, Schrag A, Anastasiou Z, et al. Association of group A Streptococcus exposure and exacerbations of chronic tic disorders: a multinational prospective cohort study. Neurology. 2021;96(12):e1680–e1693. PubMed

8. Thienemann M, Murphy T, Leckman J, et al. Clinical management of pediatric acute-onset neuropsychiatric syndrome: part I. Psychiatric and behavioral interventions. J Child Adolesc Psychopharmacol. 2017;27(7):566–573. PubMed

Medical disclaimer: This article is educational and is not medical advice. It does not diagnose, treat, or replace individualized care from your child's pediatrician or licensed medical provider. Supplement types, doses, and combinations should be selected with a qualified clinician who knows your child's full history — never start a new supplement based on a blog post alone. Always consult your pediatrician before making changes to your child's routine, and seek prompt medical care for snoring with gasping or pauses in breathing during sleep, or for any severe, sudden, or concerning symptom.