Tags: Disease.
Cryptomenorrhea or cryptomenorrhoea also known as hematocolpos[citation needed] is a condition where menstruation occurs but is not visible due to an obstruction of the outflow tract. Specifically the endometrium is shed but a congenital obstruction such as a vaginal septum or on part of the hymen retains the menstrual flow. A patient with cryptomenorrhea will appear to have amenorrhea but will experience cyclic menstrual pain.