Endometriosis occurs when tissues in the endometrium (innermost lining of the uterus) grow outside the uterus such as the fallopian tubes, ovaries, or intestines. This often causes pain especially just before, during, or just after menstruation. Some women experience extreme pain that they cannot go on with their routine. Pain may also be felt during urination, sex, and bowel movement. Women who are at risk include those who are in their 30s or 40s, have not had children, have menstrual periods which last longer than seven days, have menstrual cycles shorter than 28 days, have started their periods early (before 12 years old), and have a family member who has endometriosis. This condition is often confirmed through scanning techniques, such as ultrasound, MRI, and CT scan. The results are also validated through laparoscopy which enables the physician to take samples for biopsy.