The difference between menstruation and menstrual discharge includes the cause, duration and color of bleeding. 1. Causes of bleeding: Menstruation is a kind of bleeding symptom caused by the shedding of the uterine lining induced by the ovarian ovulation cycle and the change of hormone level in the body; the bad dew belongs to a kind of material coming out of the vagina after abortion, mid-term induced abortion, and necrotic meconium after childbirth, which generally includes red, plasma, and bloody bad dew. 2. Bleeding time: The bleeding time of menstruation is usually from 2 days to 7 days, and can be stopped naturally in 3-5 days on average. It usually takes 4 weeks to 6 weeks for the discharge, and most of the time it takes 28 to 42 days after delivery to be completely cleared. 3. Bleeding color: The color of normal menstruation is usually dark red and will not solidify. The color of post-partum discharge is changing, from red to white. If you find any abnormality, you need to be actively examined and treated to avoid affecting your health.