The color of menstruation is light red and sparse, which is mostly normal when menstruation has just begun or is about to end, but is not normal if it occurs throughout the cycle. Menstruation is the process of bleeding from the uterus as the uterine lining peels off in response to cyclical changes in the ovaries. Menstrual blood in the menstrual period just come or almost end of the light red, thin texture is more normal phenomenon, after the normal flow is usually dark red, if the whole cycle of menstrual color light red sparse more not normal. The light red color of menstruation may be considered as endometrial inflammation or anemia. If accompanied by lower abdominal pain and so on to consider endometritis and other diseases, feasible ultrasound, gynecological examination to identify, if there is a series of manifestations of anemia, such as pallor, fatigue and other symptoms of anemia, feasible blood routine to further clarify the diagnosis. If no organic changes are found after a series of examinations and there is no special discomfort, the light red color of menstruation can be checked regularly and no special treatment is needed.