Menstruation is not contagious. Menstruation is a physiological phenomenon, is due to the ovaries cyclic changes, that is, hormone level changes, the cycle of the uterine lining shedding as well as bleeding, the normal menstrual cycle is an average of 28 days, a small number of people will be different, but the normal will have a certain degree of regularity, each person’s cycle is different, so the date of the menstruation will be different, and there is no contagion of each other’s situation. Since the menstrual cycle is about 7 days, there may be overlapping periods of menstruation in women around you, but it is not caused by contagion. Menstruation is an important sign of maturity for women, and it is important to stay happy during your period, as well as to get enough sleep. If there is any discomfort or abnormality during menstruation, it is recommended to go to the hospital in time for examination and follow the doctor’s instructions to deal with the treatment.