Nighttime work may also play havoc with the menstrual cycle. "Painful menstruation (dysmenorrhea), absence of menstruation (amenorrhea), and heavy menstruation (menorrhagia) are conditions associated with women taking the graveyard shift," Colina said. "Although the study isn't conclusive, it provides us [with] pointers on how to address and protect the occupational health and safety of working women at call centers."
Call centers must take a note of the study and provide free and regular breast cancer screening for their employees, he added.