Sudden-onset OCD and tics in children often have an infectious or immune root cause.
Obsessive-compulsive behaviors and motor or vocal tics are increasingly recognized as potential markers of neuroinflammation in children, particularly when they appear suddenly or worsen in clear association with an illness. When OCD and tics develop gradually and have a clear psychiatric context, traditional approaches are appropriate. When they appear abruptly, seemingly overnight, the root cause is often biological rather than primarily psychological.
PANS and PANDAS are the key diagnostic considerations in sudden-onset presentations, but other infections (including Lyme disease, EBV, and Mycoplasma) and environmental triggers (including mold) can also drive these neurological symptoms. Thorough root cause investigation can identify the biological driver and guide a path toward resolution.