The Daily Mail is reporting in London, "Menstruating girls are staying home for fear of being made to feel 'period shame'".
Gender-neutral toilets in schools have left girls feeling unsafe and even put their health at risk, parents and teachers have warned.
Girls who are menstruating are so anxious about sharing facilities with boys that some are staying at home for fear of being made to feel 'period shame'.
With a growing number of both primary and secondary schools installing unisex toilets, some girls are risking infections by refusing to urinate all day.
Others are so fearful they have stopped drinking liquids at school.
Parents and teaching staff have told The Mail on Sunday that female pupils feel deeply uncomfortable or even unsafe sharing toilets with male students.