Every experienced pediatrician, child psychologist, and child psychiatrist knows this child. One week they're thriving. The next, they refuse to eat, develop obsessive fears, can't separate from their parents, begin having motor tics, or explode in rage. Parents almost always describe it the same way: "A switch flipped." Many add something even more heartbreaking: "It's like I lost my child overnight."
For some families, that sudden change marks the beginning of months or years of searching for answers. Children are often diagnosed with anxiety, obsessive-compulsive disorder (OCD), ADHD, eating disorders, or behavioral disorders. Those diagnoses may accurately describe the symptoms, but according to children's mental health expert Dr. Roseann Capanna-Hodge, they may not fully explain what's driving them.
Drawing on more than 30 years of clinical experience, analysis of more than 10,000 quantitative EEG brain maps, and her own family's experience navigating PANS and Lyme disease with her son, Dr. Roseann believes one question is too often overlooked: What changed biologically?
At NeuroImmune Day, a leading conference on neuroimmune health, Dr. Roseann will challenge clinicians to look beyond symptoms and consider how the nervous system, immune system, and brain interact when a child changes almost overnight. "When a child changes this dramatically, we have to ask a different question," says Dr. Roseann. "Not simply, 'What diagnosis fits these symptoms?' but 'What changed biologically that caused this child to change so suddenly?'"
Conditions such as PANS (Pediatric Acute-onset Neuropsychiatric Syndrome), PANDAS, Lyme disease, autoimmune encephalitis, and other neuroimmune disorders can trigger inflammation that affects the brain, immune system, and autonomic nervous system. For some children, the result is a dramatic change that appears almost overnight. What looks like anxiety may be neuroinflammation. What looks like defiance may be a nervous system locked in survival mode. Researchers estimate that PANS alone may affect as many as 1 in 200 children, yet many healthcare professionals receive little formal training in recognizing it.
One of the most frustrating experiences for families is watching children receive appropriate care while continuing to struggle. According to Dr. Roseann, one important question is often overlooked: What state is the child's nervous system in? "When the brain and body remain locked in chronic survival mode, healing becomes much more difficult," she explains. "The nervous system influences everything from emotional regulation and executive functioning to sleep, digestion, immune function, and a child's ability to benefit from therapy and medical treatment."
This understanding forms the foundation of Regulation First®, Dr. Roseann's clinical framework, which views nervous system regulation as a biological prerequisite for healing. At NeuroImmune Day, Dr. Roseann will present "PANS/PANDAS and the Whole-Body Matrix: Why Dysregulation Isn't Just a Brain Issue," exploring how chronic nervous system activation affects not only behavior but immune function, sleep, gut health, and the body's overall ability to recover.
For parents whose child changes overnight, Dr. Roseann encourages them not to wait. "Trust what you're seeing," she says. "Those changes deserve thoughtful medical evaluation and a conversation with clinicians who understand the connection between the brain, the immune system, and the nervous system." She also notes that simply learning that these sudden changes can have biological drivers brings enormous relief. "It doesn't automatically provide all the answers, but it changes the questions we ask — and sometimes that's where healing begins."
Dr. Roseann's forthcoming book, The Dysregulated Kid: The Parenting Playbook for Helping Your Child Find Calm in a Chaotic World, will be published by Page Two Books on September 22, 2026. Built around the Regulation First® framework, the book introduces practical strategies families can begin using immediately, including the Love Pause®, CALMS Protocol®, and 10-Minute Resets. "I wrote the book I wish every parent had the moment they realized, 'Something has changed, and I don't know what to do next,'" says Dr. Roseann. "Families don't need more blame or more behavior charts. They need practical tools that help them understand what's happening beneath the surface."
