The dangers of not going on your period for a month can be infections that can lead to pelvic inflammatory diseases; it can also cause secondary anemia. A period should refer to having a menstrual period. Normally, a woman’s period lasts from 2 to 8 days each time, with the average being around 5 days. The total blood loss per menstrual period is roughly between 20 and 60 milliliters. If menstruation lasts for a longer period of time, there is a risk of infection and secondary anemia. 1. During a woman’s menstruation, the cervical opening is in a state of dilatation. If menstruation lasts for more than a month, as the cervix is in a dilated state, pathogens are more likely to enter the uterine cavity through the cervix, increasing the probability of infection, which may lead to pelvic inflammatory disease. 2. Menstruation lasts for more than a month and there is bleeding all the time, which may lead to secondary anemia. When there is secondary anemia, the patient may have symptoms such as dizziness, body weakness and pallor. If menstruation lasts for more than a month, you need to go to the hospital in time for examination, to clarify the cause of the long duration of menstruation, and then take targeted treatment, such as uterine fibroids, you may need to do surgery.