PANDAS is considered to be a subset of pediatric acute-onset neuropsychiatric syndrome, or PANS. Children who develop sudden, dramatic symptoms of OCD or eating disorders—seemingly overnight—may be given a diagnosis of PANS if all other possible causes are ruled out. PANS is like PANDAS in that the most likely cause is thought to be an abnormal immune reaction; unlike PANDAS, it is not related to strep bacteria. Other possible causes of PANS include metabolic disturbances or inflammation-related issues.