Women experience bleeding due to inflammation of the endometrium, mainly when inflammation occurs, the endometrium becomes congested, edematous, more fragile, and less stable. There is infiltration of inflammatory cells in the endometrium, which may also lead to abnormalities in coagulation function. The extent of lesions varies from person to person, leading to differences in the duration and amount of bleeding. For example, some women may only experience changes in the amount of menstruation, such as increased menstrual flow or prolonged periods lasting over eight days, typically without any bleeding. Others may experience irregular vaginal bleeding, where there is constant, light spotting.