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When Your Child Changes Overnight: A Parent’s Guide to PANS, PANDAS, and Pediatric Mental Health

ByDr. Marie Jean-Baptiste Reading Time: 4 minutes

As a parent, you know your child better than anyone else. You know their quirks, their moods, their normal developmental phases. So what happens when your child’s behavior changes dramatically, sometimes literally overnight?

If your child suddenly develops severe anxiety, intense obsessive-compulsive behaviors, or unusual tics out of the blue, you might be dealing with a condition known as PANS or PANDAS.

Here is what you need to know about these sudden-onset conditions, how they are treated, and why your pediatrician is your best partner in navigating your child’s mental health.

What Are PANS and PANDAS?

PANS (Pediatric Acute-onset Neuropsychiatric Syndrome) and PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections) are conditions where a child experiences a sudden and severe “explosion” of neuropsychiatric symptoms.

The hallmark signs of these conditions usually strike prepubertal children almost overnight and include at least one of the following major changes:

  • Sudden, severe Obsessive-Compulsive Disorder (OCD)
  • Severely restricted food intake (suddenly refusing to eat)
  • The abrupt onset of a tic disorder

Alongside these core signs, a child might also experience severe anxiety, intense mood swings, depression, irritability, a sudden drop in school performance, developmental regression (like baby talk), or even physical symptoms like new sleep disruptions or frequent bedwetting.

If you’ve ever felt like you went to bed with one child and woke up with a different one, you are not imagining it. This is exactly what these conditions can look like.

What Causes This Sudden Change?

The medical community believes these syndromes are triggered by the body’s immune system mistakenly causing inflammation in the brain in response to an infection or stressor.

  • PANDAS is specifically linked to a preceding or current Strep throat infection (Group A streptococcal infection).
  • PANS is a broader category. The exact same symptoms can be triggered by other infections such as the flu, mycoplasma, or Lyme disease, or even by severe psychosocial stress.

In March 2025, the American Academy of Pediatrics published a formal clinical report in its journal Pediatrics recognizing PANS as a valid diagnosis and offering pediatricians guidance on how to evaluate and manage it. The AAP also called for more rigorous research, acknowledging that the field still lacks consensus on diagnostic biomarkers and standardized treatment. In other words: the condition is real, it is taken seriously, and the science continues to evolve.

How is it Diagnosed and Treated?

If you notice these sudden, overnight changes, your pediatrician should be your first point of contact. Because the symptoms hit a “crescendo” within 24 to 48 hours, it is incredibly distressing, and a thorough medical evaluation is essential.

Your doctor will likely take a detailed clinical history, perform a physical and neurological exam, and check for an active strep infection using a throat culture.

If your child is diagnosed with PANS or PANDAS, treatment usually involves a multi-layered approach:

  1. Treating the Infection. If there is an active strep infection, your doctor will prescribe a standard course of antibiotics. Some children see their psychiatric symptoms improve with antibiotics alone, though long-term “preventative” antibiotic use is not routinely recommended.
  2. Therapy for Psychiatric Symptoms. Even after an infection clears, many children need help managing persistent mental health symptoms. Cognitive Behavioral Therapy (CBT), specifically a type called Exposure and Response Prevention (ERP), is considered the gold standard for treating the OCD and eating restrictions associated with PANS/PANDAS.
  3. Medication for Mental Health. Selective Serotonin Reuptake Inhibitors (SSRIs), commonly prescribed for anxiety and depression, can be highly effective. When combined with CBT, SSRIs often provide the best results for getting children back on track.

The Good News: Pediatricians Are Stepping Up for Mental Health

It is completely normal to feel overwhelmed if your child needs psychiatric medication. So you should know this: pediatricians are more equipped than ever to help you manage these treatments.

Over the past decade, as the country has faced a youth mental health crisis, SSRI prescribing in primary care has increased more than sevenfold (Vernacchio et al., 2024). And in a 2025 AAP Periodic Survey of nearly 900 practicing primary care pediatricians, 81% agreed or strongly agreed that prescribing medication for childhood anxiety and depression is part of their direct responsibility.

The AAP recommends a combined approach for moderate-to-severe mood disorders: starting an SSRI to reduce symptom intensity while simultaneously referring the child to evidence-based psychotherapy (like CBT). Therapy matters because it teaches children long-term coping skills that protect against future mental health struggles.

While pediatricians generally feel comfortable treating teens, they are also actively working to increase their training to confidently support younger children (under 12) who need mental health care.

And in a direct primary care setting like ours, where I have the time to actually sit with a family, watch a child over weeks rather than minutes, and coordinate care with a therapist or psychiatrist when needed, this kind of layered, patient mental health support is exactly what the model was built for.

Trust Your Gut

The sudden onset of a condition like PANS or PANDAS is terrifying. But you are the expert on your child. If you suspect an infection has dramatically changed your child’s behavior, speak up.

Your pediatrician is there to validate your concerns, run the right tests, and build a collaborative care team (which might include a therapist and a psychiatrist) to help your child recover. Treatment may take time, but with the right support, your child can find relief from these sudden, disruptive symptoms.

Sources & further reading

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