When menstruation occurs, the situation of excessive urination is mainly due to the forward-flexed and anteverted position of the uterus, and when menstruation occurs, the pelvic cavity is in a state of congestion, so it will also stimulate the bladder, which will lead to the situation of excessive urination. This condition usually eases significantly after menstruation. In addition, it is also important to distinguish that during menstruation, because the urethra of women is short and straight, if the sanitary napkin is not changed in time, it may lead to inflammation of the urethra, so the situation of urinary urgency, frequency and polyuria may occur. Clinically, if this situation occurs, it is best to have a routine urine test. If it is a routine urine test and there are white blood cells, it is caused by inflammation of the urethra. It is recommended to drink more water and to change sanitary napkins regularly when you have your period and to keep your vulva clean to avoid infection of the urinary tract.