II. Types

  1. Primary Amenorrhea
    1. No secondary sexual characteristics by 13 years old or
    2. No menstrual period by (failure to reach Menarche by):
      1. Fifteen years old or
      2. Three years after initial Breast development (Thelarche)
  2. Secondary Amenorrhea
    1. Previously regular cycles: 3 months of no Menses
    2. Previously irregular cycles: 6 months of no Menses

III. Causes: Axis 1 - Hypothalamus

  1. Primary Amenorrhea (congenital causes)
    1. Anovulation (10% of primary causes)
    2. Constitutional (6% of primary causes): Family History
    3. Gonadotropin deficiency such as Kallmann's Syndrome (Rare): Associated with Anosmia
  2. Secondary Amenorrhea (acquired causes)
    1. Anovulation (50% of secondary causes)
    2. Post-Hor monal Contraception (Post-Pill)
    3. CNS injury
      1. Traumatic Brain Injury
      2. Meningitis
      3. CNS Neoplasm
      4. Brain Radiation
      5. Infiltrative or autoimmune (e.g. Sarcoidosis)
    4. Functional Hypothalamic Amenorrhea
      1. Eating Disorder (e.g. Anorexia Nervosa)
      2. Female Athlete Triad
      3. Malabsorption, Malnutrition or rapid weight loss

IV. Causes: Axis 2 - Pituitary

  1. Primary Amenorrhea (congenital causes)
    1. Hyperprolactinemia (2% of primary causes)
    2. Pituitary Tumor (8% of primary causes)
      1. Pituitary Adenoma (Hormone producing)
      2. Pituitary Null Cell Tumor (No Hormone produced)
      3. Empty Sella Syndrome
      4. Pituitary Tuberculosis
      5. Pituitary Schistosomiasis
  2. Secondary Amenorrhea (acquired causes)
    1. Hyperprolactinemia (25% of secondary causes)
      1. See Medication Causes of Hyperprolactinemia
    2. Sheehan Syndrome (infarction, rare)
    3. Hypothyroidism (1% of secondary causes): Prolactin-like effect
    4. Pituitary infiltration (e.g. Sarcoidosis)
    5. Cushing Syndrome

V. Causes: Axis 3 - Ovarian insufficiency

  1. Primary Amenorrhea (congenital causes)
    1. Polycystic Ovary Syndrome (10% of primary causes)
      1. Findings: Obesity, Hirsutism, and Acne Vulgaris
    2. Turners Syndrome and Mosaics (30% of primary causes)
      1. Findings: Short Stature, Web neck, and Shield Chest
    3. Genetic Male (10% of primary causes)
    4. Gonadal dysgenesis (other than Turner Syndrome)
  2. Secondary Amenorrhea (acquired causes)
    1. Polycystic Ovary Syndrome (8% of secondary causes)
    2. Premature Ovarian Failure (10% of secondary causes)
    3. Oophoritis (rare)
      1. Chemotherapy or Radiation
      2. Infection (e.g. Mumps, Tuberculosis)

VI. Causes: Axis 4: Uterus (Uterine Outflow Tract Obstruction and abnormalities)

  1. Primary Amenorrhea (congenital causes)
    1. Mullerian Agenesis (20% of primary causes)
      1. Mayer-Rokitansky-Kuster-Hauser Syndrome
    2. Imperforate Hymen
    3. Transverse vaginal septum
    4. Complete androgen resistance or androgen insensitivity syndrome
    5. 5a-reductase Deficiency
  2. Secondary Amenorrhea (acquired causes)
    1. Asherman Syndrome (5% of secondary causes)
    2. Endometritis
    3. Cervical stenosis

VII. Causes: Miscellaneous

  1. Other endocrine causes
    1. See Hypoandrogenism
    2. Late-Onset Congenital Adrenal Hyperplasia (adult onset)
    3. Androgen-Secreting tumor
    4. Adrenal Insufficiency
    5. Cushing Syndrome
    6. Diabetes Mellitus (uncontrolled)
    7. Polycystic Ovary Syndrome
    8. Hypothyroidism
  2. Chronic Disease
    1. Celiac Disease
    2. Inflammatory Bowel Disease
  3. Physiologic causes
    1. Pregnancy!
    2. Lactation
    3. Contraception
    4. Menopause
    5. Exogenous androgens

VIII. History

  1. Sexual Development History (if possible Primary Amenorrhea)
    1. Breast development
    2. Pubic hair development
  2. Menstrual and Gynecologic history
    1. Age at Menarche
    2. Menstrual Cycle characteristics
    3. Premenstrual symptoms
    4. Sexual Activity
  3. Family History
    1. Genetic anomaly
    2. Menarche age of onset in first degree relatives
  4. Obstetric history
  5. Past medical history
    1. Chronic disease history
    2. Chemotherapy
    3. Radiation Therapy
  6. Medications (including Substance Abuse)
    1. See Medication Causes of Hyperprolactinemia
    2. See Medication Causes of Abnormal Uterine Bleeding
  7. Eating Disorder or Female Athlete Triad (Functional Hypothalamic Amenorrhea)
    1. Diet, Weight change, or Eating Disorder
    2. Overtraining or Exercise addiction
    3. History of Stress Fractures
  8. Prolactinoma symptoms
    1. Galactorrhea
    2. Headache
    3. Bitemporal field cut
  9. Hyperandrogenism or Polycystic ovary symptoms and signs
    1. Hirsutism
    2. Acne Vulgaris
  10. Growth abnormalities
    1. Short Stature (Turner Syndrome)
  11. Other history
    1. Vasomotor Symptoms of Menopause (e.g. Hot Flushes)
    2. Hypothyroidism symptoms (cold intolerance, Palpitations, Constipation, Major Depression)
    3. Anosmia (Kallmann Syndrome)

IX. Examination

  1. Breast Exam
    1. Normal Breast development suggests circulating Estrogens (Primary Amenorrhea)
    2. Galactorrhea (Hyperprolactinemia)
  2. Gynecologic exam
    1. Rule out uterine or ovarian anomaly
    2. Vaginal Atrophy (red or thin vaginal mucosa)
      1. Low Estrogen
    3. Transverse septum or Imperforate Hymen
      1. Outflow tract obstruction
    4. Shortened Vagina
      1. Uterine outflow obstruction
      2. Mullerian Agenesis
    5. Absent Cervix or Uterus
      1. Mullerian Agenesis
      2. Androgen Insensitivity Syndrome
    6. Clitoromegaly
      1. Androgen Secreting tumor
      2. Congenital Adrenal Hyperplasia
      3. 5a-Reductase Deficiency
  3. Body Mass Index (and height and weight)
    1. Low BMI in Functional Hypothalamic Amenorrhea
    2. High in Polycystic Ovary Syndrome
  4. Hyperandrogenism or Polycystic Ovary Syndrome
    1. Hirsutism
    2. Acne Vulgaris
    3. Acanthosis Nigricans
    4. Male pattern baldness
  5. Other focus areas
    1. Cushing's Disease
      1. Central Obesity
      2. Buffalo Hump
      3. Hypertension
      4. Hirsutism
      5. Wide, purple abdominal and thigh striae
    2. Thyromegaly
    3. Turner Syndrome
      1. Webbed Neck
      2. Short Stature
      3. Low hairline

XI. Labs: Second-Line

  1. Karyotype
    1. Turner Syndrome (45 X with one missing X)
    2. Mullerian Agenesis (46 XX)
    3. Genetic Male (46 XY) with male-range Serum Testosterone
      1. Androgen Insensitivity Syndrome
      2. 5A-Reductase Deficiency
  2. Serum Testosterone
    1. Mildly decreased
      1. Functional Hypothalamic Amenorrhea
      2. Menopause
      3. Primary Ovarian Insufficiency
    2. Mildly increased Testosterone
      1. Polycystic Ovary Syndrome (PCOS)
    3. Increased to male range Testosterone
      1. See Hyperandrogenism
      2. Congenital Adrenal Hyperplasia
      3. Adrenal or ovarian tumor
      4. Cushing Syndrome
      5. Genetic male
        1. Androgen insensitivity syndrome
        2. 5a-Reductase Deficiency
  3. 17-Hydroxyprogesterone (17-OHP, obtained at 8 am)
    1. Increased
      1. Congenital Adrenal Hyperplasia (late onset)
  4. Dehydroepiandrosterone Sulfate (DHEA-S)
    1. Mildly increased
      1. Congenital Adrenal Hyperplasia
      2. Hyperprolactinemia
      3. Polycystic Ovary Syndrome (PCOS)
  5. Anti-Mullerian Hormone (AMH)
    1. Decreased
      1. Primary Ovarian Insufficiency
      2. Menopause
    2. Mildly increased
      1. Polycystic Ovary Syndrome (PCOS)
    3. Increased
      1. Functional Hypothalamic Amenorrhea
  6. Serum Estradiol
    1. Decreased in poor ovarian function (low in most Amenorrhea except for outflow obstruction)

XII. Imaging: First-Line

  1. Pelvic Ultrasound
    1. Evaluate uterine structure
    2. Uterine outflow obstruction

XIII. Imaging: Second-Line (as indicated)

XIV. Evaluation

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Related Studies

Ontology: Amenorrhea (C0002453)

Definition (CSP) absence of menses for three months or more.
Definition (MSH) Absence of menstruation.
Definition (PSY) Absence or abnormal cessation of the menses.
Concepts Disease or Syndrome (T047)
MSH D000568
ICD9 626.0
ICD10 N91.2
SnomedCT 156034000, 198414005, 156037007, 14302001
French AMENORRHEE, Absence de règles, Absence de menstruation, Aménorrhée SAI, Aménorrhée
English AMENORRHEA, AMENORRHOEA, Amenorrhoea NOS, Amenorrhea, unspecified, Amenorrhoea, unspecified, Amenorrhea NOS, amenia, amenorrhea, amenorrhea (diagnosis), Amenorrhea, Menses lack of, Amenorrhea [Disease/Finding], cessation of menses, menstruation absence, absence of menstruation, lack of menses, Amenorrhoea (finding), Amenorrhea NOS (finding), Amenorrhoea NOS (finding), Absence of menstruation, Amenorrhoea, Amenorrhea (finding), absence; menstruation, Absence of menstruation, NOS, Amenorrhea, NOS, Amenorrhoea, NOS, amenorrhoea
Portuguese AMENORREIA, Falta de menstruação, Amenorreia NE, Ausência de menstruação, Amenorreia
Spanish AMENORREA, Amenorrea NEOM, Ausencia de menstruación, Falta del periodo, Amenorrhoea NOS, amenorrea, SAI, amenorrea, SAI (hallazgo), Amenorrhea NOS, amenorrea (hallazgo), amenorrea, ausencia de menstruación, falta de menstruación, Amenorrea
German AMENORRHOE, Ausbleiben der Menstruation, Amenorrhoe NNB, Ausbleiben der Menses, Amenorrhoe, nicht naeher bezeichnet, Amenorrhoe
Dutch missende menstruatie, amenorroe NAO, afwezigheid van menstruatie, afwezigheid; menstruatie, Niet gespecificeerde amenorroe, amenorroe, Amenorroe
Italian Assenza di mestruazioni, Amenorrea NAS, Amenorrea
Japanese 無月経NOS, 月経欠如, ムゲッケイ, ゲッケイケツジョ, ムゲッケイNOS, 無月経
Swedish Menstruation, utebliven
Czech amenorea, Chybění menses, Amenorrhoea NOS, Amenorea, Nepřítomnost menstruace
Finnish Amenorrea
Korean 상세불명의 무월경
Polish Brak miesiączki
Hungarian Amenorrhoea k.m.n., Amenorrhoea, amenorrhoea, Menstruatio hiánya, Menses hiánya
Norwegian Manglende menstruasjon, Amenorrhea, Uteblitt menstruasjon, Amenoré