The menstrual volume of 30ml belongs to the normal menstrual volume, a little bit less, ordinary sanitary napkin can wet through two sanitary napkins, if the women’s menstrual volume is very regular, always about 30ml, also belongs to the normal phenomenon, the period is relatively short, about 2-3 days can be over, the volume of the second day will be more, the latter are less. The normal menstrual volume for women is about 20-60ml, less than 5ml is too little, more than 80ml is too much, too much or too little is abnormal, too little may be caused by the symptoms of poor ovarian function and less secretion of estrogen and progesterone, which may easily cause infertility or miscarriage after pregnancy. If the menstrual flow is too much, it is also related to endocrine secretion and may cause excessive blood loss in women causing anemia, which needs to be treated under the guidance of a doctor.