On the first day of menstruation, as the endometrium starts to peel off, the discharge volume will become less and may change the color of menstruation, showing a brown discharge. In case of insufficient qi and blood, eating spicy and stimulating food, as well as raw and cold food or even alcohol before menstruation may affect the change of color of menstruation, which can be observed for one day. If the menstrual flow increases the next day and the color returns to normal, it will not affect your health. On the second day of menstruation, if the brown discharge persists, it is important to rule out the possibility of pregnancy. If you have sexual intercourse without measures that month, it may cause brown discharge. It is recommended to go to the gynecology department for HCG and progesterone test to determine if there is any chance of pregnancy. If you are sure that you are not pregnant, you can use motherwort pellets or a combination of pellets for seven days to regulate your menstruation, which will not affect your health if it occurs only once, and you can observe the change of your menstruation next month.