The color of a woman’s menstrual period, which is normally dark red, has debris from the endometrium in addition to blood. If the menstrual blood is bright red, it may be because there is more menstrual blood and it flows out from the uterine cavity faster without stagnation in the vagina, the menstrual blood that comes out may be bright red. Whether the menstrual blood is dark red or bright red, as long as the menstrual volume is normal, the period is normal, and there can be regular menstrual flow is a normal physiological manifestation and will not have adverse effects on the body. If a woman’s menstrual flow is particularly heavy, exceeding 80 ml, and is full of bright red blood or accompanied by lower abdominal pain and anemia, it is considered to be abnormal due to adenomyosis or anovulatory dysfunctional uterine bleeding. Actively go to the hospital to clarify the cause of the bleeding to exclude early pregnancy and stop the bleeding if necessary.