Normal women only menstruate once a month, but some women find themselves menstruating twice a month sometimes. How is this? Is this a sign of irregular menstruation? Experts from the University Hospital of the Second Affiliated Hospital of Heavy Medicine believe that if there is sudden bleeding after the menstrual period 10 day, it is in the middle of menstruation, and it is ovulation bleeding. Ovulation bleeding is a normal phenomenon, which is caused by the sudden decrease of estrogen in follicular rupture. Generally, the bleeding will stop within 3-5 days. If it happens once in a while, it doesn't need to be treated, but if the regular period is twice a month, then it needs to be treated. Menstruation twice a month, multiple menses a month or no menstruation for a month, etc. After many women have menstrual disorders, the two-word holiday for a month is only considered from gynecological diseases such as uterine hypoplasia, acute and chronic pelvic inflammatory disease and uterine fibroids, while ignoring life factors. Many bad habits that are often unconscious may be the culprit leading to menstrual disorders. 1, greed for cold: Women suffering from cold during menstruation will contract the blood vessels in the pelvic cavity, leading to ovarian dysfunction, which can cause too little menstrual flow and even amenorrhea. 2, stress: women of childbearing age, if under pressure for a long time, will inhibit the function of pituitary gland, so that the ovary will no longer secrete female hormones and ovulation, menstruation will begin to be disordered. Similarly, long-term depression, sulking or bad mood will also affect menstruation. 3. Electromagnetic waves: All kinds of household appliances and electronic equipment will produce different electromagnetic waves during use. These electromagnetic waves will have a bad effect on women's endocrine and reproductive functions for a long time, leading to endocrine disorders and menstrual disorders. 4, constipation: after the stool in the rectum is overfilled, the cervix will be pushed forward, and the uterine body will be tilted backwards. If uterine retroversion occurs repeatedly for a long time, the veins in the broad ligament will be compressed and blocked, and the uterine wall will be congested and lose elasticity. If the uterus stays in a backward position for a long time, low back pain and menstrual disorder will occur. 5, drug abuse: abuse or frequent use of antibiotics, for women can cause menstrual disorders, ovulation, amenorrhea, which may be that drugs inhibit and hurt people's own resistance, leading to body dysfunction. In addition, if some women suffer from menstrual disorder after taking emergency contraceptives that month, then this is a normal phenomenon and does not need to be dealt with. As long as you remember to take contraceptive measures well, it is recommended not to exceed three times a year because of the great side effects of emergency contraception.