Menstrual disorders are changes in normal menstruation (periods). Changes may be short or long term.
A normal cycle is about 28 days from the first day of bleeding to the first day of the next period. It is also normal for it to be 21 to 35 days. The rise and drop of the hormones progesterone and estrogen cause a period to happen. A rise causes the lining of the uterus to become thin. A drop causes the lining to break down and pass out of the body. This is what causes bleeding. Bleeding often lasts from 3 to 5 days. It is also normal for it to last 7 days.
This cycle will happen each month from about 12 years of age to an average age of 51 years of age. The cycle normally only ends with pregnancy or
Most women lose about 2 ounces of blood or less.
Menorrhagia is a loss of more blood than normal. This happens if there is a high volume of blood or a period that lasts more than 7 days. It can be caused by hormone changes or physical problems. The loss of blood can lead to
and other health problems.
Absence of Menstruation
Girls may not start to have their period when expected. This is called primary
amenorrhea. It is found when a girl does not have a period by:
Age 14 without growth of pubic hair and breasts
Age 16 with or without growth of pubic hair and breasts
Periods may also stop after they have already started. Secondary amenorrhea is when it is absent for at least 3 cycles. It may be caused by:
Bleeding Disorders in Women. US Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/ncbddd/blooddisorders/women/index.html. Updated April 25, 2018. Accessed November 14, 2019.
Klein DA, Poth MA. Amenorrhea: an approach to diagnosis and management. Am Fam Physician. 2013 Jun 1;87(11):781-788.
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