PANS in Adults: Can It Happen and What Are the Symptoms?
Sudden anxiety, OCD, or behavioral changes without explanation? Some patients experience abrupt neuropsychiatric symptoms that do not follow a typical pattern.
PANS in adults is not commonly recognized—but similar symptom patterns may occur beyond childhood, particularly when symptoms are sudden, severe, and linked to infection or immune dysfunction.
Quick Answer: PANS is most often diagnosed in children, but adults may experience similar sudden-onset neuropsychiatric symptoms. In some cases, symptoms persist from childhood; in others, adult-onset cases resembling PANS have been reported.
This overlap is especially important in patients with complex conditions such as Lyme disease, where infection-triggered immune responses may affect the brain.
What Is PANS?
PANS (Pediatric Acute-onset Neuropsychiatric Syndrome) is defined by the sudden onset of obsessive-compulsive symptoms or severe eating restriction, along with other neuropsychiatric symptoms such as anxiety, mood changes, irritability, and sleep disruption.
Symptoms typically appear abruptly and can fluctuate over time.
According to the National Institute of Mental Health, PANS may be triggered by infections, immune system dysfunction, or environmental factors leading to inflammation that affects brain function.
In 2012, Swedo and colleagues proposed broader clinical criteria for PANS that shifted the focus from a single infectious trigger to a clinical syndrome characterized by abrupt symptom onset. This expanded the original PANDAS concept to include multiple potential infectious, inflammatory, and immune-mediated causes.
For a broader overview of symptoms, causes, and diagnostic considerations, see PANS and PANDAS in children.
Can PANS in Adults Occur?
PANS in adults is less commonly recognized, but similar clinical patterns are increasingly reported.
Studies suggest several possible pathways:
- Symptoms that begin in childhood and persist into adulthood
- Cases diagnosed later in life after years of unexplained symptoms
- Rare cases of adult-onset symptoms following infection
One of the earliest reports questioning whether PANDAS could occur in adults was published in 2001, describing an adult patient with infection-associated obsessive-compulsive symptoms. More recently, a 2022 study characterized adults with PANS-like illness, suggesting that similar clinical presentations may occur beyond childhood, although adult PANS remains an evolving area of research.
In a qualitative study of adults with PANS-like illness, participants described long-standing symptoms, often beginning in childhood, along with difficulty obtaining recognition and care.
PANS in adults is not widely recognized.
Common Symptoms of PANS in Adults
Symptoms in adults often resemble those seen in children but may be interpreted differently.
- Sudden onset or worsening of OCD symptoms
- Anxiety or panic symptoms
- Depression or mood instability
- Irritability or behavioral changes
- Sleep disturbance
- Difficulty concentrating or “brain fog”
- Sensory sensitivity
These symptoms may come and go over time, often in response to triggers or illness.
Learn how symptom patterns fluctuate in why Lyme symptoms come and go.
Beyond the core diagnostic features, some adults report additional symptoms that are not part of the formal PANS criteria.
- Brain fog or slowed thinking
- Fatigue or low energy
- Headaches or head pressure
- Dizziness or autonomic symptoms
- Sensory sensitivity
- Sleep disruption
These symptoms may reflect broader effects of immune activation or nervous system involvement rather than a single isolated disorder.
In some patients, these broader symptoms overlap with patterns seen in infection-related illnesses such as Lyme disease.
What Causes PANS in Adults?
The exact cause of PANS in adults is not fully understood.
Current theories focus on immune-mediated inflammation affecting the brain following infectious or other inflammatory triggers.
Possible triggers include:
- Bacterial infections
- Viral infections
- Immune system dysregulation
- Inflammatory responses affecting neural circuits
Unlike the original PANDAS criteria, which focused specifically on streptococcal infection, the broader PANS framework does not require evidence of strep infection and recognizes that multiple infectious or noninfectious triggers may produce a similar clinical syndrome.
These mechanisms overlap with broader models of infection-triggered neurologic illness.
PANS in Adults and Lyme Disease
In clinical practice, some patients with Lyme disease develop abrupt neuropsychiatric symptoms that resemble PANS in adults.
Possible overlapping mechanisms include:
- Immune activation
- Neuroinflammation
- Infection-triggered symptom flares
These symptoms may also worsen after stress, illness, or exertion. Learn more about what triggers Lyme symptoms to flare.
The authors who proposed the PANS criteria noted anecdotal reports of acute-onset obsessive-compulsive symptoms and tic disorders occurring in patients with chronic Lyme disease while emphasizing that additional systematic research is needed to determine whether Lyme disease can serve as a trigger in susceptible individuals.
For more on the overlap between infection and neuropsychiatric symptoms, see Lyme disease and PANS.
While Lyme disease is not the same as PANS, overlap in clinical presentation can complicate diagnosis.
Why PANS in Adults Is Often Missed
PANS in adults is frequently overlooked for several reasons:
- PANS is traditionally considered a pediatric condition.
- Symptoms are often attributed to primary psychiatric disorders.
- Infection-related triggers may not be recognized.
- Many clinicians are unfamiliar with reports describing PANS-like illness in adults.
Adults with PANS-like illness often report difficulty obtaining a clear diagnosis and coordinated care.
This reflects a broader challenge in conditions that fall between neurology, immunology, infectious diseases, and psychiatry.
Does the “Pediatric” Label Limit Recognition?
The term Pediatric Acute-onset Neuropsychiatric Syndrome (PANS) can create confusion when similar symptoms appear in adults.
Because the condition is defined around childhood onset, clinicians may be less likely to consider it in older patients—even when the pattern of abrupt neuropsychiatric symptoms is similar.
This labeling may contribute to delayed recognition in adults whose symptoms do not fit typical psychiatric or neurologic patterns.
Although the diagnostic criteria were developed for children, the underlying mechanisms of infection-triggered immune dysfunction are not necessarily limited by age.
Clinical Perspective
PANS remains a pediatric clinical syndrome, and adult-onset cases have not been studied as extensively as childhood presentations.
However, published case reports, observational studies, and patient series suggest that PANS-like illness may occur beyond childhood or persist into adulthood.
When adults develop sudden obsessive-compulsive symptoms, marked behavioral changes, or other abrupt neuropsychiatric symptoms following infection, clinicians may consider immune-mediated and infection-triggered disorders as part of the differential diagnosis while excluding other neurologic, psychiatric, and medical conditions.
Clinical Takeaway
PANS in adults is not widely recognized, but similar abrupt neuropsychiatric syndromes have been reported beyond childhood.
When symptoms develop suddenly, fluctuate over time, and do not fit a typical psychiatric pattern, clinicians may consider infection-triggered or immune-mediated causes alongside more common diagnoses.
Greater awareness may help reduce delays in diagnosis and encourage more comprehensive evaluation.
Frequently Asked Questions
Can adults develop PANS?
Although PANS is defined as a pediatric syndrome, published case reports and observational studies suggest that similar clinical presentations can occur in adults or persist from childhood.
What triggers PANS symptoms?
Current evidence suggests that infections, immune activation, and inflammatory responses may trigger abrupt neuropsychiatric symptoms in susceptible individuals.
Is PANS the same as Lyme disease?
No. PANS is a clinical syndrome, whereas Lyme disease is an infectious illness. However, Lyme disease may produce neuropsychiatric symptoms that overlap with those seen in PANS.
Can Lyme disease trigger PANS?
The original PANS authors acknowledged anecdotal reports linking chronic Lyme disease with acute-onset neuropsychiatric symptoms, but additional research is needed to determine whether Lyme disease can directly trigger PANS in susceptible individuals.
Why is PANS in adults often overlooked?
Because PANS was originally defined in children, many adults with similar symptom patterns are initially evaluated for primary psychiatric or neurologic disorders rather than infection-triggered immune dysfunction.
Related Articles
Learn more about infection-triggered neuropsychiatric symptoms and Lyme disease:
- Lyme Disease and PANS
- PANS and PANDAS in Children
- Neuropsychiatric Lyme Disease
- Brain Fog in Lyme Disease
- Why Lyme Symptoms Come and Go
References
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- Frankovich J, Swedo SE, Murphy TK, et al. Clinical Management of Pediatric Acute-Onset Neuropsychiatric Syndrome: Part I—Psychiatric and Behavioral Interventions. J Child Adolesc Psychopharmacol. 2015;25(1):3-13.
- Bodner SM, Morshed SA, Peterson BS. The question of PANDAS in adults (PubMed). Biol Psychiatry. 2001;49(9):807-810. doi:10.1016/S0006-3223(00)01127-6.
- Swedo SE, Leckman JF, Rose NR. From Research Subgroup to Clinical Syndrome: Modifying the PANDAS Criteria to Describe PANS (Pediatric Acute-onset Neuropsychiatric Syndrome). Pediatr Ther. 2012;2(2):113. doi:10.4172/2161-0665.1000113.
- Mahadevan LSK, Murphy M, Selenica M, Latimer E, Harris BT. Clinicopathologic Characteristics of PANDAS in a Young Adult: A Case Report. Dev Neurosci. 2023;45(6):335-341. doi:10.1159/000534061.
- Murphy TK, Gerardi DM, Leckman JF. Pediatric acute-onset neuropsychiatric syndrome. Psychiatr Clin North Am. 2014;37(3):353-374. doi:10.1016/j.psc.2014.06.001.
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
What type of specialist can evaluate an adult for this? Neurologist?
An adult with these symptoms may be evaluated by several specialists depending on the pattern of symptoms — including primary care, infectious disease, rheumatology, neurology, orthopedics, or cardiology. A neurologist may help if there are stinging, burning, numbness, balance, or cognitive symptoms. It can also help to see a clinician experienced in Lyme disease and related conditions.