Blood pressure refers to the lateral pressure of the blood flowing in the blood vessels against the walls of the blood vessels, and is related to the volume of the heart per beat, peripheral resistance, heart rate, vascular elasticity and circulating blood volume. For women, the causes of low blood pressure are as follows: 1. menstruation, blood loss occurs during menstruation, and the sudden loss of a large amount of blood can lead to a decrease in the amount of circulating blood in the body, resulting in low blood pressure. 2. female hormonal influence, estrogen causes peripheral blood vessels to dilate, blood is concentrated in the microcirculation, and blood at the large vessels is relatively reduced, resulting in lower blood pressure. 3. menopause is prone to endocrine diseases, such as When thyroid hormone secretion decreases, it will reduce cardiac output causing a drop in blood pressure. 4, the reduction of body water when losing weight will also cause low blood pressure.