Progesterone is a steroid hormone secreted by the luteal cells of the ovary. The effects of progesterone deficiency on menstruation include irregular menstrual cycles and drenching menstruation. Menstruation is mainly caused by the cyclic shedding of the uterine lining under the action of estrogen and progesterone, resulting in cyclic bleeding from the woman’s uterus and vaginal discharge. When there is insufficient progesterone in a woman’s body, the shedding of the endometrium will be incomplete, resulting in irregular menstrual cycles, such as early menstrual cycles, dribbling of menstruation, etc. In addition, low progesterone will also affect the woman’s ability to get pregnant. If a woman is found to have insufficient progesterone, it is recommended that she go to the hospital in time, follow the doctor’s instructions to improve further examination, and actively cooperate with the doctor’s treatment.