Outside the possibility of pregnancy, if the menstrual cycle takes more than about 35 days or even longer to come. If the period is delayed for 3 consecutive cycles, it is called delayed menstruation and is a sign of irregular menstruation. The causes of irregular menstruation are the following three: a. Stress, if women of childbearing age are under excessive stress for a long time, it will inhibit the function of the pituitary gland, so that the ovaries no longer secrete female hormones, resulting in the phenomenon of non-ovulation, so that menstruation will appear chaotic. So women must release their stress to relieve their emotions and avoid being in a state of excessive stress for a long time. Second, too much cold, resulting in some women like to drink cold drinks during their periods, which will make the blood vessels in the pelvis constrict, which will lead to abnormal ovarian function, causing low menstrual flow. Some even have the phenomenon of amenorrhea, so women must do a good job of keeping warm during their periods to keep their menstrual flow normal. Third, constipation, constipation is also one of the causes of menstrual disorders in women. When too much stool accumulates, the cervix will be pushed forward, and the uterus will be tilted backward. If this happens for a long time, back pain and irregular menstruation can occur. If you want to improve the situation, you should eat more vegetables and fruits during the week to increase the fiber in your body, thus making the bowel movement faster and being able to defecate normally.