pediatric acute-onset neuropsychiatric syndrome (pans) is the name of a disease that normally begins in childhood. it causes obsessive-compulsive disorder (ocd) and/or tics. the symptoms begin very suddenly. if it is not treated at the beginning the disease can be there also in adults. the reason for pans can be a bacteria called "group a streptococcus" (pandas type) or an immunologic reaction to other pathogens like certain bacteria or viruses. (pitands type).