PANS & PANDAS
A complete guide about PANS & PANDAS
Your child changed drastically and fast, and everyone keeps telling you it is anxiety, or a phase, or that kids just do this. Meanwhile you are holding a stack of normal results.
What it is · Symptoms · Diagnosis · Treatment · Safety · How I help
- PARENT'S QUICK TAKE
What are PANS and PANDAS? PANS and PANDAS are immune conditions where an infection triggers inflammation that affects a child's brain, causing a drastic, fast change: sudden OCD, rage, food refusal, or handwriting that falls apart. The goal of care is to find and treat the underlying trigger while calming the immune response.
- QUICK ANSWER
What are PANS and PANDAS?
PANS and PANDAS describe a child who develops a sudden, dramatic change in behavior, most often obsessive compulsive behavior or a sharp drop in eating, believed to be driven by the immune system overreacting to an infection or another trigger and inflaming the brain. PANDAS is the form tied specifically to strep. PANS is the broader term that includes other triggers such as mycoplasma, viruses and other infections. Both are diagnosed clinically based on the pattern and timing of symptoms. There is no single test that confirms them.
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RECOGNITION
Does this sound like your child?
One month your child is fine. The next, they are washing their hands raw, refusing foods they used to love, and going from zero to screaming in seconds over things that never used to matter.
I want to be honest about how this actually presents, because the way it gets described online is a little dramatic. It is rarely as literal as a child going to bed one person and waking up another. What parents describe to me is drastic but slightly more diffuse than that. All of a sudden the handwriting went to the wayside. All of a sudden they cannot regulate the way they could a month ago. All of a sudden everything has to be exactly right. It is fast enough that you can nearly name the week.
Handwriting is one of the most useful signals there is. A child who could form their letters and now cannot, who cannot get a thought onto paper the way they could last term, is telling you something real.
SYMPTOMS
What are the symptoms of PANS and PANDAS in children?
The defining feature is how fast it appears. Almost every case starts with at least one of the two anchor symptoms below.
Obsessive compulsive behavior
Intrusive fears, rituals, checking, contamination worries, and things having to be just right before anyone can move on.
Severely restricted eating
Sudden food refusal or fear of food, often tied to fears of choking, vomiting or contamination rather than taste or texture.
SIGNS
What tends to come with it
Alongside an anchor symptom, children usually show a sudden change in at least two of these areas.
Intense anxiety, including separation anxiety that seems much younger than their age
Mood swings, irritability, aggression or rage episodes
Behavioral or developmental regression, acting much younger than before
A sudden drop in school performance, focus or memory
Handwriting that deteriorates noticeably
Tics and other sudden motor changes
Sensory sensitivities that were not there before
Sleep that falls apart
New bedwetting or other urinary changes
THE DIFFERENCE
How are PANS and PANDAS different?
PANDAS
Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal infections. In plain language, a child develops sudden OCD, tics, or both shortly after a strep infection, because the immune system's response to strep also affects the brain.
PANS
Pediatric Acute-onset Neuropsychiatric Syndrome. The umbrella term. Same drastic, fast onset, but the trigger does not have to be strep. It can be mycoplasma, influenza, a sinus infection, other viruses, tick borne infections, environmental exposures including mold, and in some children non infectious triggers.
What is actually happening in the body?
The leading explanation is this. While the immune system is busy fighting an infection, it mistakes part of the brain for the invader and creates inflammation in a region called the basal ganglia, the part of the brain that helps regulate movement, emotion and impulse control. It is an immune system on a hyper response, and it will not settle back down on its own.
That is why this shows up as behavior. Not because your child decided to behave this way. Understanding the difference between PANS and PANDAS is important, especially when considering when the distinction actually changes the plan.
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EVALUATION
How is PANS or PANDAS evaluated?
By building a picture, not by running one test. There is no single result that confirms this, and anyone who tells you otherwise is overselling.
Traditional labs answer the first question: is there a trigger, and what is it? Those are ordinary blood tests looking at immune and inflammatory markers, and at infection both past and present. I am deliberately not printing a list of lab abbreviations here, because what happens next is a parent walks into their pediatrician's office asking for letters nobody in that room recognises, and it goes badly for everyone. Bring me the story and I will order what your child needs.
Functional testing answers the second question: what is in this body keeping it going? That includes the Cunningham Panel, which is specifically built for this picture, along with testing for inflammation, mast cell and histamine patterns, and genomics that can show why a particular child stays ramped up when another child settles.
When a child experiences a sudden change in symptoms, the evaluation starts by understanding the timeline and then considering targeted testing. Learn more about the order a sudden-onset change gets worked up in.
THE WORK
What does functional medicine add to PANS and PANDAS care?
Address the infectious trigger
Find what set this off and deal with it directly, whether that is strep, mycoplasma, a virus, a tick borne infection, or an environmental exposure.
Calm the immune and inflammatory response
An immune system stuck in a hyper response is the engine of the whole picture. Bringing that down is what changes how a child feels day to day.
Rebuild resilience
Gut healing, replacing what has been depleted, and getting sleep back. This is the part that determines what happens the next time your child gets sick. Learn why I seal the gut before I clear anything out
As the immune confusion settles, flares tend to become shorter and softer.
Every child is different here. Some continue to flare each time they get sick. Others never have an issue again. It depends on how that particular immune system responds, and it is genuinely hard to predict at the start. That is something we learn together over time.
HONESTY
When functional medicine is not the whole answer
I do not do IVIG. Families ask me about it and the answer is that this belongs with an immune specialist. My role is to work alongside them, not to pretend I do everything.
Some children with this picture become genuinely psychotic. That is a different level of care and it needs the right team quickly.
If your child is in crisis right now, please call or text 988 for the Suicide and Crisis Lifeline, or go to your nearest emergency department. For a sudden severe medical change, call 911 or your pediatrician. I am the person you call about the plan we built together, about a reaction to something we started, and about symptoms getting worse on my watch. Read what the evidence actually says about Lyme and PANS
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YOU ARE NOT IMAGINING THIS
When it is PANS, the missing piece hides in the immune system
I do not think parents are imagining this, and I want to say that plainly because you have probably been made to feel otherwise.
What you have been told is that it is just anxiety. That it is a phase. That kids do this. And you have a folder of normal results to go with it. Here is what I think actually happens: it gets missed because nobody was looking for it. The results come back unremarkable because the right questions were never asked.
Your child changed. You noticed. You are right that it means something.
QUESTION
PANS and PANDAS questions parents ask at two in the morning
More questions? The full FAQ covers cost, testing, school support and everything else parents ask me.
Keep reading on the blog: how PANS and PANDAS are treated with functional medicine, and what a flare looks like at home, and how to track one.
READ MORE
Related concerns
When the belly is the clue
Gut healing is how resilience gets rebuilt after a flare.
When you want to know why this child
Genomics can show why one immune system stays ramped up.
If Lyme is a concern for your child, learn more about ticks and Lyme in children and when mold is the trigger underneath
WHERE WE SERVE
In person in Omaha, and by telehealth in six states.
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Omaha, Nebraska
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Arizona, Colorado, Iowa, Nebraska, Tennessee, Virginia
Not on that list? Reach out anyway. I would rather tell you honestly what I can and can't do than leave you guessing, and if I can't see you I'll point you toward someone who can.
ABOUT THE AUTHOR
Amy Patton, DNP, APRN, CPNP-PC
Pediatric nurse practitioner and founder of Happy Kid Functional Medicine
I'm a pediatric nurse practitioner with more than a decade of clinical experience, and the founder of Happy Kid Functional Medicine in Omaha, Nebraska. I started my career in underserved communities and spent years in primary care watching the same children come back with the same unresolved symptoms, handed from specialist to specialist while nobody actually got to the bottom of it. I built this practice so those families would have somewhere else to go.
I'm also a member of the Medical Academy of Pediatric Special Needs, and I keep a standing network of clinicians who have been doing this work for decades. When I don't know something, I go find out. More about how I work →
Content reviewed by Amy Patton, DNP, APRN, CPNP-PC · Updated August 2026
LAST WORDS
This is not who your child is. It is something happening to them, it is physical, and it is workable.
You are not failing your child. You are not overreacting. You are not alone in this anymore.
With you in this, Amy
Amy Patton, DNP, APRN, CPNP-PC · Happy Kid Functional Medicine