The normal blood pressure range for women aged 30-40 is 90-140 mmHg systolic and 60-90 mmHg diastolic, and the blood pressure should be controlled to 130 mmHg systolic and 80 mmHg diastolic for better physical function and disease prevention. If there are abnormal fluctuations in blood pressure for a long period of time, you should seek medical attention promptly and take appropriate measures to relieve the disease after clarifying the cause. Hypertension is diagnosed when the blood pressure is measured three times on non-same day and the systolic blood pressure is ≥ 140 mmHg and/or diastolic blood pressure is ≥ 90 mmHg. There are more causes of hypertension in women. First, it is associated with genetic factors, and when both parents suffer from hypertension, children have a higher chance of developing hypertension. Secondly, women’s hypertension is different from men’s because of their sex hormone levels. Taking birth control pills can also affect the secretion of sex hormones and lead to higher blood pressure. Moreover, for women during pregnancy, they are also prone to hypertension, which is considered to be related to abnormal trophoblast invasion. In addition, conditions such as diet, stress disorders, and poor lifestyle habits can also reflexively cause elevated blood pressure in women. Women are also prone to hypotension due to physical reasons. When menstrual flow is excessive, hypotension can occur due to reduced blood volume. And if estrogen drugs are used, they can have a vasodilating effect, which can sometimes lead to lower blood pressure. In addition, women can also have lower blood pressure due to weight loss, dieting, etc. Therefore, when a woman’s blood pressure is significantly higher or lower, if there is a cause, it can be relieved by removing the cause. When the cause is not clear, you should seek medical attention and treat it through medication control and other means under the guidance of a doctor.