As each woman’s specific cause of dysmenorrhea is different, so the duration will be different, dysmenorrhea can be divided into primary dysmenorrhea and secondary dysmenorrhea, the details are as follows: 1, primary dysmenorrhea: the general duration may be in 1-2 days, often in the first day of menstruation and the second day of menstruation will be particularly obvious symptoms of pain, but in the menstrual period of the third day of the pain will be gradually reduced, or even completely Secondary dysmenorrhea: it is very likely that the pain will last for more than three days, or even during the whole menstrual period, because women with secondary dysmenorrhea may have pain caused by necrosis of ectopic lesions, so that they will have pain symptoms during the whole menstrual period.