PANDAS and PANS in Children: When OCD and Anxiety Have a Physical Cause
Most OCD develops gradually. Symptoms build over months or years, intensifying under stress and easing at other times. But some children experience a different pattern: OCD that appears almost overnight, with no warning and no gradual buildup. One week the child seems fine. The next, they are consumed by intrusive thoughts, rituals, and a level of anxiety that feels completely out of proportion.
When that pattern occurs, PANDAS or PANS may be the explanation.
What Are PANDAS and PANS?
PANDAS stands for Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections. It describes a specific subset of OCD and tic disorders that appear to be triggered by Group A streptococcal infection, meaning strep throat or scarlet fever.
PANS stands for Pediatric Acute-onset Neuropsychiatric Syndrome. It is a broader category that includes PANDAS but encompasses sudden-onset OCD or restricted eating triggered by any infectious or environmental trigger, not only strep.
Both conditions were first described in research at the National Institute of Mental Health in the 1990s. The leading hypothesis is that in some children, an immune response to an infection creates antibodies that mistakenly cross-react with brain tissue in the basal ganglia, triggering the sudden onset of OCD or tic symptoms. The National Institute of Mental Health has published extensively on this mechanism and continues to support research in this area. More information is available through the PANDAS Network and the International OCD Foundation.
Signs That May Indicate PANDAS or PANS
The hallmark feature is abrupt onset. Symptoms appear dramatically, often over 24 to 72 hours. This is different from the gradual escalation seen in typical OCD.
Other signs include:
Sudden emergence of OCD symptoms or a dramatic worsening of existing symptoms
New onset tics or sudden worsening of pre-existing tics
Emotional lability, severe irritability, or unexpected rages
Separation anxiety that seems to appear from nowhere
Sensory sensitivities, such as refusing certain textures, clothing, or sounds
Sudden changes in handwriting or fine motor skills
Urinary urgency or bedwetting in a child who was previously continent
Sleep disturbances that coincide with symptom onset
Restricted food intake that begins suddenly
Importantly, the timing often correlates with a recent strep infection or illness, even one that seemed mild or that passed without a formal diagnosis.
How PANDAS and PANS Are Diagnosed
There is no single definitive test for PANDAS or PANS. Diagnosis is clinical, meaning it relies on the pattern of symptom onset, the child's medical history, and the ruling out of other explanations.
A physician with experience in PANDAS and PANS will typically:
Take a detailed history of when symptoms began and whether they followed an illness
Test for recent strep infection through a throat culture, rapid strep test, or strep antibody blood tests
Evaluate for other possible causes of sudden neuropsychiatric change
Assess whether symptoms follow a relapsing-remitting course that tracks with subsequent infections
Families pursuing a PANDAS or PANS diagnosis often benefit from working with both a pediatric psychiatrist or neurologist and a physician experienced with pediatric autoimmune conditions. The PANDAS Network maintains a provider directory at pandasnetwork.org for families looking for knowledgeable medical providers.
Treatment: The Two-Pronged Approach
Effective treatment for PANDAS and PANS addresses both the underlying medical cause and the neuropsychiatric symptoms.
Medical Treatment
The medical component typically involves treating the infection that triggered the episode, usually with antibiotics in the case of strep, and in some cases, interventions to reduce the abnormal immune response, such as anti-inflammatory medications. For children with frequent relapses, some physicians recommend prophylactic antibiotics to prevent recurrence. More intensive immune-based treatments such as IVIG and plasmapheresis are sometimes used in severe or refractory cases and are the subject of ongoing clinical research.
Medical treatment decisions should be made by a physician with specific experience in PANDAS and PANS.
Behavioral Treatment: ERP for OCD Symptoms
Medical treatment addresses the trigger, but it does not always fully resolve the OCD symptoms that have taken root. Behavioral treatment for the OCD component is typically required alongside medical management.
The behavioral treatment with the strongest evidence for OCD is Exposure and Response Prevention (ERP). ERP involves gradual, systematic exposure to the thoughts, images, or situations that trigger obsessional anxiety, paired with preventing the compulsive response. This process reduces the anxiety response over time and breaks the OCD cycle.
In PANDAS and PANS, ERP is approached carefully. A child's tolerance may fluctuate with the course of the underlying illness, and pacing needs to reflect where the child is medically. An experienced OCD therapist who understands PANDAS and PANS will adjust the intensity of exposure work accordingly and stay in communication with the medical team.
When DBT Skills Support Recovery
For some children with PANDAS or PANS, the disruption to daily life is severe enough that emotion regulation support is needed alongside OCD treatment. Intense anxiety, emotional outbursts, and sudden changes in mood and behavior can strain family relationships and make it harder for the child to engage productively in ERP.
In these situations, DBT-C can provide a structured framework for building distress tolerance and emotion regulation skills. These skills are not a substitute for ERP, but they can help stabilize a child enough to engage more effectively in OCD treatment. The parent component of DBT-C is also valuable here, as parents learn how to respond to their child's emotional dysregulation in ways that support rather than inadvertently reinforce avoidance.
What Parents Should Know
PANDAS and PANS are still not universally recognized across all medical providers. Some families spend months trying to understand what happened to their child before finding a clinician who recognizes the pattern. If your child experienced sudden-onset OCD or dramatic behavioral changes following an illness, pursuing evaluation from a knowledgeable physician is worth the effort.
On the behavioral side, finding a therapist who understands how PANDAS and PANS interact with standard OCD treatment is equally important. ERP that is too aggressive during an active flare can backfire. Good communication between the medical team and the treating therapist makes a meaningful difference in how well the child progresses.
If you have questions about OCD treatment for your child, you are welcome to reach out to our team at EBT Collaborative or schedule a consultation to discuss your child's specific situation.