If it occurs once in a while, it may be caused by getting cold or eating cold food during menstruation, so you can observe it for the time being and don’t need to deal with it. You should not eat cold, spicy and stimulating food, and keep warm during your period. If menstruation is often less than a day, it can not be ruled out that it is caused by endocrine disorders, or frequent operation of the uterine cavity caused by endometrial damage, uterine cavity adhesions and caused by low menstrual flow. Therefore, on the second day of menstruation, you should take a blood test on an empty stomach to check the hormone level, to know the function of the ovaries, and you can also take a hysteroscopy within three to seven days after the menstruation, to know the condition of the uterine cavity, whether there is any adhesion in the uterine cavity or the condition of the uterine cavity, and then you can give the effective treatment according to the result of the test.