Amenorrhea classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Classification
Primary amenorrhea
In primary amenorrhea there is absence of menarche by the age of 16.
Menstruation cycles never begin.
There will be a delay of menses one year beyond the family history of first menses.
There is no defining sexual characteristics by age 14. Primary amenorrhea 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 amenorrhea
Secondary amenorrhea is defined as absence of menses in a woman who had previously menstruated for at least 3 cycles or 6 months. Secondary amenorrhea is more common than primary Amenorrhea.
Secondary amenorrhea is often caused by hormonal disturbances from the hypothalamus and the pituitary gland or from premature menopause, or intrauterine scar formation.
Oligomenorrhea
Oligomenorrhea is a condition in which menses are infrequent. This condition is not the same as Amenorrhea.