1) Wasting disease, such as severe tuberculosis, severe anemia, malnutrition, endocrine diseases; adrenal gland disorder, pancreas dysfunction. These can cause menstruation. If only these disease are cured, then have a natural menstrual period.
2) Lower reproductive tract atresia. Such as the cervix, vagina, hymen, labia, etc., some congenital atresia, or acquired injury resulted in adhesion of atresia, although menstruation, but blood can not drain. This is recessive amenorrhea. Lower reproductive tract atresia, it is completely curable.
3) Genital dysplasia. Some people with congenital non-ovarian or ovarian dysplasia, can not produce estrogen and progesterone, the endometrium can not produce cyclical changes, so causes amenorrhea. Some congenital absence of uterus, or endometrial dysplasia, or endometrial injury, even if healthy ovarian function, estrogen and progesterone secretion is normal, also cause absence of menstruation.
4) Tuberculosis endometritis. This is due to invasive endometrial tuberculosis, cause endometrial inflammation, to varying degrees of damage, and finally scar tissue there, and cause amenorrhea.
5) Pituitary or hypothalamic abnormal. Pituitary can secrete gonadotropin. Gonadotropin have regulation of ovarian and maintain menstruation. If pituitary disorders, will affect gonadotropin secretion, lead to the side effects of ovarian function, ovarian abnormal would cause amenorrhea. In addition, hypothalamic abnormal can cause amenorrhea. Hypothalamic dysfunction are caused by many reasons, such as the spirit of excitement, sadness anxiety, fear, anxiety, tension fatigue, as well as environmental changes, cold stimulus. The hypothalamic abnormal is most common causes of amenorrhea.