Almost no bleeding on the first day of menstruation is due to the slow withdrawal of progesterone as well as estrogen from the body at the beginning of the menstrual cycle. A small amount of vaginal bleeding or brown discharge may occur as the blood vessels of the endometrium do not undergo frequent contraction and the functional layer of the endometrium does not appear to shed significantly. This is a normal phenomenon. As long as the menstrual cycle is normal and the amount of menstruation on the second day as well as the third day is normal, maintaining around 30-80ml, no special treatment is needed. Pay attention to menstrual hygiene, avoid bathing and forbid sexual intercourse to prevent reproductive system infection. Pay attention to keep warm during menstruation and avoid getting cold, otherwise it will cause menstrual cramps. Try to eat lightly, prohibit smoking and alcohol, avoid spicy and stimulating food, and avoid raw and cold food to prevent excessive menstrual flow. Pay attention to keep a happy mood and avoid excessive psychological stress.