What is endometriosis and how many women are affected?

Endometriosis is the most common gynaecological disease in women of reproductive age, experienced by up to 10% of women. This is usually a painful disease in which the cells of the endometrium are located outside the uterus. During menstruation, these cells also bleed, causing inflammation. Symptoms of the disease include more painful menstruation, pain in the lower abdomen or blood in the urine. Endometriosis is a very common cause of female infertility.