Absent Periods

(Absent Menses; Amenorrhea)


Menstruation, or a menstrual period, refers to the monthly process in which the uterus sheds blood and tissue because pregnancy did not occur.Not having or missing a menstrual period is called amenorrhea. This condition is divided into 2 types:
  • Primary amenorrhea—when an adolescent female has not yet begun menstruation by around age 16 years
    • Most females begin menstruating between the ages 9-18, but age 12 is the average.
  • Secondary amenorrhea—when a woman who has previously menstruated misses 3 or more periods in a row
Menstrual Flow
Menstrual Flow
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The most common cause of secondary amenorrhea is pregnancy. In non-pregnant women, it may be due to a variety of factors.

Risk Factors

Factors that may increase the risk of amenorrhea include:
  • Dramatic weight loss (such as from extreme diets, eating disorders, or excessive exercise) or dramatic weight gain
  • Malnutrition
  • Birth defects, including lack of female reproductive organs
  • Chromosomal or hormonal abnormalities
  • Certain conditions such as thryoid disorder and pituitary tumor
  • Medications such as certain contraceptives
  • Emotional distress
  • Uterine scarring


The main symptom for primary amenorrhea is the absence of a menstrual period in a female by age 16 or older. The main symptom for secondary amenorrhea is 3 or more missed periods in a row in a woman who has previously had menstrual periods.

When Should I Call My Doctor?

Call your doctor if you:
  • Have not had your first period and are aged 16 years or older
  • Miss having your period

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