Pale red menstruation may be caused by anemia, weakened ovarian function, endometritis and other reasons, which need to be analyzed specifically. 1. Anemia: large amount of blood loss during menstruation is prone to iron deficiency anemia, at this time, due to anemia, the amount of red blood cells in the menstrual blood is reduced, and the color may become lighter. 2. Weakened ovarian function: when the ovaries secrete relatively less estrogen, the endometrium will become thinner and the menstrual blood may become light red. 3. Endometritis: When a woman with endometritis has her period, there will be a lot of exudate in the uterus, and the menstrual blood will be diluted by the large amount of exudate, and the color of the menstrual blood may become light red. There may be other reasons for the light red color of menstrual blood, so it is important to go to the hospital in time for an examination to determine the cause of the disease and treat the symptoms. During menstruation, pay attention to keep warm and maintain good living habits.