Abrupt Onset Is the Clue
PANDAS describes sudden-onset obsessive-compulsive symptoms or tics following a streptococcal infection. PANS is the broader category, where the trigger may be another infection, an environmental exposure, or a metabolic stressor. In both, the striking feature is speed: severe symptoms appearing over days rather than developing over years.
Families describe handwriting deterioration, new food refusal or fear of choking, separation anxiety, rage episodes, bedwetting returning, and a child who suddenly cannot stop checking or washing.
Why It Gets Missed
The symptoms are psychiatric, so the referral is psychiatric, and the immune trigger is never looked for. Families are frequently told it is anxiety, defiance, or a parenting problem. Meanwhile the underlying picture — immune activation affecting the basal ganglia — goes unexamined.
Streptococcal testing is often negative by the time the child is seen, and a negative swab is then treated as ruling the whole thing out.
The Root-Cause Picture
What we look at: infection history including strep, mycoplasma, Epstein-Barr and tick-borne exposure; mould and mycotoxin exposure in the home; gut health and the state of the intestinal barrier; nutrient status; and family history of autoimmunity.
The aim is to find what is keeping the immune system activated rather than to manage each behaviour separately. Care is coordinated with the child paediatric and mental health team, not instead of it.