There is a difference between dysmenorrhea and menstruation, menstruation is cyclical, menstruation time is about 3-7 days, the longest will not be more than 7 days, menstruation around the 2nd day of menstruation is more heavy, it is a normal body condition, every mature and normal women will have menstrual flow. Menorrhagia is a functional bleeding problem of the uterus, mainly considered to be caused by endocrine causes of abnormal bleeding, but the time is not quite certain and irregular, sometimes a small amount of bleeding, sometimes may be delayed for about 2-4 weeks, the need to take medication to alleviate the problem of menorrhagia. Long-term untreated dysmenorrhea can lead to other complications, which have a great impact on women and need to be taken seriously.