Introduction: Irregular use of toilets can contribute to urinary and gastrointestinal disorders. The aim of this study was to assess the prevalence of gastrointestinal and urinary symptoms among a secondary school teenage population and to evaluate their perception and use of school toilets.Methods: 791 adolescents aged 12 to 16 filled in an anonymous questionnaire, which was administered in three secondary schools near Saint-Etienne, France.Results: 22% reported abdominal pain at least once a week during the past two months and 26% experienced abdominal pain about once every month. 9% of schoolchildren suffered from urinary incontinence at least once during the two months before the study: 4% of boys and 13% of girls. Children had a negative perception of school toilets: 62% didn’t feel safe and 54% of boys reported a lack of privacy. 34% of students avoided school toilets: 21% never used them to urinate and 85% never used them to defecate. 28% of children acknowledged they had experienced abdominal pain because they couldn’t use school toilets and 29% said that they had experienced poor concentration as a result of their pain.Discussion: Abdominal pain and urinary disorders are common among secondary schoolchildren. Stool and urine withholding behaviours are be widespread and affect students’ concentration while at school.