Amenorrhea - Primary
Alternate Names : Absent Menses, Absent Periods, No Periods, Primary Amenorrhea
Definition This condition is the absence of any menstrual flow in a woman who has never menstruated by the age of 16.
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Overview, Causes, & Risk Factors
Most girls begin menstruating between ages 9 and 18, with an average around 12 years old. Primary amenorrhea is not considered to have occurred until a girl is beyond age 16, if she has undergone other normal changes that occur during puberty. Primary amenorrhea may occur with or without other signs of puberty.
There are many possible causes of primary amenorrhea:
- Drastic weight reduction (resulting from poverty, fad dieting, anorexia nervosa, bulimia, very strenuous exercise, or other cause)
- Malnutrition
- Genital abnormalities present since birth (absence of the uterus or vagina, vaginal septum, cervical stenosis, imperforate hymen)
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Hypoglycemia
- Extreme obesity
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Gonadal dysgenesis
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Hypothyroidism and hyperthyroidism
- Chronic (long term) illnesses
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Cystic fibrosis
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Cushing's disease
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Polycystic ovarian disease
- Galactorrhea
- Chromosomal abnormalities such as Turner's syndrome (XO), or Swyer's syndrome (XY)
- Hypogonadotropic hypogonadism
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Testicular feminization syndrome
- True hermaphroditism
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Adrenogenital syndrome
- Congenital heart disease (cyanotic)
- Congenital adrenal hyperplasia
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Craniopharyngioma, ovarian tumors, adrenal tumors
- Prader-Willi syndrome
- Pregnancy
Primary amenorrhea in the United States occurs in less than 0.1% of girls.
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