Premature ovarian failure generally refers to early-onset ovarian insufficiency. The fact that menstruation comes back after premature ovarian failure does not mean that it is well, and it is considered to be caused by diminished ovarian reserve function, cervical cancer or endometrial cancer. 1. Hypoplasia of ovarian reserve function: patients with early-onset ovarian insufficiency will have fluctuating decrease in estrogen level in the early stage, and abnormal menstruation occurs, but it is not amenorrhea directly, so there is a possibility that menstruation will come back again after stopping menstruation for a period of time. This does not mean that it is well, it just means that it is in the stage of diminishing ovarian reserve function, and the ovarian function is not completely exhausted. 2. Cervical cancer or endometrial cancer: some patients with early-onset ovarian insufficiency will stop menstruation after a period of time. If there are symptoms of vaginal bleeding, it may also be caused by cervical cancer or endometrial cancer, which will also have vaginal bleeding, and some people may mistake it for menstruation, which does not mean that early-onset ovarian insufficiency is well. Early detection of ovarian insufficiency and menstruation is not an indication of well, it is recommended that patients go to the hospital in time to check, to clarify the specific causes, under the guidance of the doctor symptomatic treatment.