Usually, the color of menstruation is dark red. The main constituents of menstrual blood are blood and endometrial fragment tissue, and the bleeding volume of one menstrual period is 30-50ml, accompanied by a small amount of blood clots. If the color of menstruation is light, consider possible causes such as anemia, endocrine disorders and uterine lesions. 1. anemia: large blood loss during menstruation, easy to develop iron deficiency anemia, the color of menstrual blood may become light, coupled with the stimulation of external cold, the cold in the body is heavy, menstrual blood may be light red, and may be accompanied by abdominal pain, etc. 2. endocrine disorders: low level of estrogen secretion in the body, insufficient estrogen may It may lead to endometrial hyperplasia not thick enough, less endometrial shedding during menstruation, less bleeding and light color, or due to long-term late night, high work pressure, bad mood, may cause endocrine disorders of different degrees leading to light menstrual color, and may also be accompanied by symptoms of irregular menstruation; 3, uterine lesions: inflammation of the endometrium or the appearance of uterine lesions, there is often a lot of exudation, menstrual blood is diluted by a large amount of exudate, which may make the color of menstruation change to light red. Uterine malformation or uterine dysplasia may also lead to low menstrual volume and pale color. You should maintain good habits, balanced nutrition, and keep your abdomen warm during your menstrual period to avoid cold attacks that may cause abdominal pain and pale menstrual color. If your menstruation is light red for a long time, you should go to the hospital for hormone examination, hysteroscopy, white belt routine and other gynecological examinations to clarify the cause and professional treatment.