N91: Absent, scanty and rare menstruation
N91.1: Secondary amenorrhoea
The uterus consists mainly of a layer of muscle and a lining of mucous membrane (mucosal lining). The mucosal lining receives a good supply of blood and steadily increases in size. Unless an egg is fertilized, a large part of the mucosal lining is shed and replaced. The menstrual bleeding starts when the mucosal lining is shed. The uterus is connected to the vagina. During your menstrual bleeding the mucosal lining is discharged through the vagina to the outside of the body along with some blood.
You have not had a menstrual bleeding for at least 3 months. This can have many different causes. Menstrual bleeding may not occur if there is a change in the levels of messenger substances in the body. Menstrual bleedings are controlled by various messenger substances. Another reason menstrual bleeding may not occur is if you are under psychological stress or underweight.
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