The harm of twice a month menstruation has the following aspects: First, it can lead to female endocrine dysfunction, because in the process of menstruation, the hormone content in the female body and the changes are more regular, such as estrogen, sex hormones, progesterone and luteinizing hormone, etc., when these hormones in a short period of time and frequent changes, especially twice a month of menstruation, but also can lead to female endocrine dysfunction. Secondly, it is easy to cause female anemia, because during menstruation, women have a certain amount of blood loss, and frequent blood loss can easily cause nausea, vomiting, fatigue, drowsiness, indigestion, and a series of adverse symptoms. Thirdly, it can lead to a decline in the immune function of the female body and the body’s resistance, because the blood contains more antibodies and immune factors, etc., and the amount of blood loss in the process of two menstruation is relatively large.