Short menstrual cycles are usually a sign of low estrogen. Low estrogen levels may lead to decreased menstrual flow and short menstrual cycles. The length of the menstrual cycle and the amount of bleeding are generally related to a woman’s estrogen level. A shortened menstrual cycle can be considered if the duration of the period is less than 2 days and the amount of bleeding during the period is low. Short menstrual cycles can be caused by a lack of estrogen in a woman’s body, which prevents the follicles from developing within the normal time frame, which in turn leads to a decrease in the production of estrogen, hence short menstrual cycles. Short menstrual cycles can also be caused by stress, luteal insufficiency and uterine fibroids. Therefore, when short menstrual cycle occurs, it is recommended to go to the hospital and receive professional diagnosis from the doctor to clarify the cause of the disease and carry out further treatment, so as to achieve the goal of restoring the menstrual cycle to normal.