The first three days of women’s menstruation is almost no reason for the following possibilities: 1, normal physiological phenomena, menstrual patterns are mostly determined, due to the impact of hormone levels occasionally appear once in a while the first three days of menstruation is almost no, but also belongs to the normal phenomenon. As long as it is not frequent, no need to panic, may be related to living habits, diet, and psychological and mental factors. 2, because the endocrine system is abnormal, more work, the problem under consideration or life pressure is relatively large, if there is no correct method of releasing the pressure, it may be through the neurohumoral regulation of the endocrine system caused by the adverse effects of the hormone content in the body of the female and the type of hormone than the male to be more, the endocrine system during menstruation, the endocrine system may be affected by the hormones. The content and variety of hormones in women’s bodies are more than men’s, and when there are problems with the endocrine system during menstruation, it may lead to almost no menstruation for the first three days, which should be treated accordingly or psychologically adjusted in accordance with the individual’s situation.