How is my menstruation coming every 15 days to return a responsibility

Normal women's menstrual cycle in 28-35 days so that you 15 days to a menstrual period is definitely not normal, if you two menstrual volume is equal, need to consider uterine fibroids or cervical lesions caused by irregular bleeding, you had better go to the hospital to do sex hormones six, B ultrasound and other examinations, a clear diagnosis.