Endometriosis may cost affected women the equivalent of an entire month’s salary every year, according to a large new study from Semmelweis University in Hungary. The study, published in Preventive Medicine Reports, analyzed data from 566 women with endometriosis and 447 women without the condition. Over a four-week period, women with endometriosis lost an average of 12.7 working hours because of health-related problems. Subject of Research: The effects of endometriosis on work productivity, absenteeism, work ability, income, and workplace support. Keywords: Endometriosis, menstrual leave, women’s health, workplace health, work productivity, absenteeism, chronic pain, fatigue, reproductive health, medical economics, health policy, Semmelweis University, FEMaLe.