Which statement is true regarding endometriosis?

The statement that endometriosis can occur in areas outside the uterus is true. Endometriosis is a condition where tissue similar to the lining of the uterus, known as the endometrium, grows outside the uterus. This aberrant growth can be found on various organs within the pelvis, including the ovaries, fallopian tubes, and the outer surface of the uterus, as well as in other locations such as the intestines and bladder. This external endometrial tissue can lead to inflammation and the formation of scar tissue, which can cause pain and other symptoms.

The other options misrepresent endometriosis. It is important to note that the condition does not exclusively affect pregnant women or only occur in that context, nor is excessive menstrual bleeding a defining characteristic of the condition—while some individuals may experience heavy menstrual bleeding, it is not universal among all who have endometriosis. Furthermore, endometriosis can indeed affect fertility, which contradicts the statement regarding its relationship to fertility issues. Understanding the nature and impact of endometriosis is crucial for accurate diagnosis and treatment.