Menstruation delays 10 days half month every time, be how to return a responsibility

Female menstruation every time there is a delay phenomenon, this should be a longer menstrual cycle, if the menstrual cycle within 35 days, are normal phenomenon, and 35 days after a week or a week in advance are also normal, when the menstrual cycle more than 40 days, it belongs to abnormal phenomenon, this may be ovarian dysfunction, endocrine disorders and other factors caused.