The bright red color of menstrual blood is usually abnormal. Normal menstrual blood is mostly dark red in color and is affected by the volume of menstruation, starting out lighter, then gradually deepening to a dark red color, and finally turning brown again until it clears. Menstrual blood is a mixture of endometrial debris, cervical mucus, shed vaginal epithelial cells and blood. In healthy women, menstrual blood is mostly dark red in color, somewhat sticky, does not clot, and occasionally appears as a blood clot. If the menstrual blood is bright red in color, there may be a disorder of the clotting mechanism. If the patient has increased menstrual flow due to certain gynecological diseases, anemia may occur due to heavy bleeding. Therefore, if a patient presents with bright red menstrual blood, heavy menstrual bleeding with clots, with dizziness and weakness, it is recommended to visit the obstetrics and gynecology department of the hospital for further examination and then the doctor will formulate a relevant treatment plan.