Amenorrhea is the absence of a menstrual period in a woman of reproductive age.
Amenorrhoea are seen, most commonly, during pregnancy and lactation (breastfeeding), the latter also forming the basis of a form of contraception known as the lactational amenorrhoea method.
Primary amenorrhoea (menstrual cycles never starting) may be caused by developmental problems, such as the congenital absence of the uterus or failure of the ovary to receive or maintain egg cells. Also, delay in pubertal development will lead to primary amenorrhoea
Secondary amenorrhoea (menstrual cycles ceasing) is often caused by hormonal disturbances from the hypothalamus and the pituitary gland, from premature menopause or intrauterine scar formation

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