It is normal for the blood on the sanitary napkin to be a little white because there is endometrial debris mixed with menstrual blood. Menstruation is caused by the regular monthly shedding and bleeding of the endometrium under the action of estrogen and progesterone in the body. The main components of menstrual blood include normal blood cells, water, clotting factors and shed endometrial fragments, uterine secretions and cervical secretions, etc. Endometrial fragments normally appear white, and smaller endometrial fragments mixed with menstrual blood will appear whitish. Sometimes large pieces of endometrium are shed in the form of small white pieces of flesh, which is also a normal physiological phenomenon. The menstrual period is a special physiological period for women, it is recommended to pay attention to keep warm, do not eat cold stimulating food, so as not to cause menstrual blood discharge caused by dysmenorrhea, menstrual period should pay attention to perineal hygiene, diligent change of sanitary napkins.