How does menstruation delay coming to return a responsibility

Menstruation does not come, there may be because of uterine dysplasia, endometriosis, endometrial damage, premature ovarian failure, congenital ovarian dysplasia, ovarian tumor, polycystic ovary syndrome, pituitary infarction, pituitary tumor, mental stress, weight loss and nutritional deficiency, intense exercise, amenorrhea galactorrhoea syndrome, hypothyroidism or hyperthyroidism, adrenal cortex hyperfunction, adrenal cortex tumor and pregnancy may cause late menstruation or amenorrhea. The above health science popularization knowledge is for reference only. If necessary, please go to a regular hospital for treatment so that doctors can check and treat them in time.