Progesterone is actually a hormone secreted by the female body, which is a hormone secreted by the corpus luteum, which forms after ovulation. Therefore, if ovulation is dysfunctional and the corpus luteum is incomplete, low progesterone secretion can occur, causing irregular menstruation. In the case of early pregnancy with vaginal bleeding and lower abdominal pain, there may be pre-eclampsia, miscarriage, etc. This mostly occurs as a result of natural elimination due to poor quality of the embryo. There are also more causes of low progesterone in women, such as ovarian failure, luteal insufficiency, severe adrenal or thyroid dysfunction, diabetic patients, their own body resistance and immune system decline, environmental factors, genetic factors, etc. may cause low progesterone. During pregnancy, women with low progesterone may experience severe menstrual irregularities, such as irregular menstrual flow, irregular menstrual cycle, high or low menstrual flow, and other symptoms. Low progesterone may be detected during pregnancy in cases of preterm miscarriage, incomplete miscarriage and refractory miscarriage. In the case of low progesterone during non-pregnancy, oral contraceptives such as Mafron and Eusebio can be taken to regulate menstruation. In the case of preterm miscarriage after pregnancy, with a little vaginal bleeding but a fetal germ and fetal heartbeat, if the progesterone test is too low, you can take progesterone medication such as progesterone capsules and dextrorphan tablets. If your period is irregular, you can go to the hospital on the 2nd or 3rd day of your period to have your blood drawn for a sex hormone 6 test to be able to know clearly if you have any sex hormone abnormalities. The progesterone level should be checked in the third week of menstruation, and if low progesterone is found, it needs to be treated promptly. It is also important to develop good habits in daily life and not to stay up late.