The delayed menstruation referred to here refers to the delayed menstruation does not come, the causes of the delayed menstruation mainly include: 1, there is a regular sexual life but no contraceptive measures of women with delayed menstruation does not come, the first should be to consider the possibility of pregnancy. 2, after an abortion or cleaning surgery, generally will appear the phenomenon of delayed menstruation, at most no later than 45 days. 3, due to a variety of life events lead to Patients with excessive mood swings or prolonged mood pressure can affect the normal function of the endocrine axis, causing abnormal menstruation and delayed menstruation. 4.Long-term poor living habits, resulting in ovarian function decline is the main reason for not coming to menstruation.