If it occurs again after the end of menstruation, it may be due to low estrogen level in the body during ovulation, which may result in a small amount of bleeding in the middle of 2 periods, and it will return to normal after 2-3 days, which is not a problem. If this happens frequently, it may be caused by some kind of disease, such as cervical polyps, cervical cancer or precancerous lesions, etc. The situation may occur. If it occurs again after menopause, it is recommended to go to the hospital for a timely examination to check whether there is a possibility of cancer and to find out the cause for targeted treatment.