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158 Menstrual Disorders on Exams: How to Think, Not Just Memorize

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Menstrual Disorders: How to Think

Definition

Abnormalities in the pattern, frequency, volume, or timing of menstrual bleeding

Thinking It Through

Every question about menstrual abnormalities should trigger this sequence:

1. Rule Out Pregnancy First

  • Pregnancy can present with bleeding or amenorrhea
  • A pregnancy test is almost always the first step

2. Characterize the Bleeding Pattern

  • Amenorrhea: absence of menses
  • Oligomenorrhea: infrequent cycles
  • Menorrhagia / Heavy Menstrual Bleeding (HMB): excessive flow
  • Metrorrhagia / Intermenstrual Bleeding: bleeding between cycles
  • Dysmenorrhea: painful periods

3. Assess Stability

  • Life-threatening bleeding or anemia requires stabilization and referral

4. Consider Age and Reproductive Stage

  • Adolescents, reproductive age, perimenopause, postmenopause each have typical patterns

5. Decide the Category

  • Hormonal (anovulatory)
  • Structural (fibroids, polyps)
  • Systemic (coagulopathy, endocrine)
  • Iatrogenic (medications or contraceptives)

Menstrual Disorders

  • Abnormal timing, frequency, or volume of menstrual bleeding
  • Exam focus is pattern recognition and next step

Amenorrhea

  • Absence of menstruation
  • Common causes: pregnancy, PCOS, hyperprolactinemia, hypothalamic dysfunction, ovarian insufficiency, menopause
  • Exam keys: pregnancy test first; if negative, think anovulation or endocrine cause

Oligomenorrhea

  • Infrequent or unpredictable cycles
  • Common causes: PCOS, perimenopause, stress, energy imbalance
  • Exam keys: irregular timing points to anovulation; PCOS most common in reproductive-age patients

Menorrhagia

  • Excessive or prolonged bleeding during menses
  • Common causes: anovulation, fibroids, coagulopathy, medications
  • Exam keys: assess hemodynamic stability and anemia

Metrorrhagia

  • Bleeding between expected menstrual periods
  • Common causes: hormonal imbalance, structural lesions, pregnancy complications
  • Exam keys: intermenstrual bleeding requires evaluation

Dysmenorrhea

  • Painful menstruation
  • May be associated with structural disease such as endometriosis or fibroids
  • Exam keys: new or worsening pain warrants further workup

Physical Exam, Labs, and Studies (Shared Workup)

  • Pregnancy test is the first step in all reproductive-age patients
  • CBC assesses for anemia in heavy or prolonged bleeding
  • TSH screens for thyroid disease; both hypo- and hyperthyroidism disrupt ovulation
  • Prolactin evaluates for hyperprolactinemia, especially with galactorrhea or headaches
  • Androgen testing evaluates for PCOS when irregular cycles occur with acne, hirsutism, or obesity
  • Pelvic ultrasound evaluates for fibroids, polyps, or ovarian pathology
  • Endometrial evaluation rules out hyperplasia or malignancy in postmenopausal bleeding or prolonged unopposed estrogen exposure

Polycystic Ovary Syndrome (PCOS)

  • Common endocrine disorder of reproductive-age women
  • Caused by chronic anovulation and hyperandrogenism, often driven by insulin resistance
  • Most common cause of irregular menses and anovulatory infertility

Clinical Presentation

  • Irregular or infrequent menstrual cycles
  • Signs of hyperandrogenism: acne, hirsutism, androgenic alopecia
  • Obesity or weight gain common
  • Infertility may be the presenting complaint
  • Typical stem: young woman with irregular periods, acne, and difficulty conceiving

Diagnostics

  • Clinical diagnosis based on pattern and exclusion
  • Rule out pregnancy, thyroid disease, hyperprolactinemia
  • Androgen levels may be elevated
  • Pelvic ultrasound may show polycystic ovaries but is not required

Treatment

  • Lifestyle modification and weight loss first-line
  • Combined hormonal contraceptives regulate cycles and reduce androgen effects
  • Metformin improves insulin resistance and may restore ovulation
  • Ovulation induction if fertility desired

Exam Keys

  • Irregular menses plus hyperandrogenism equals PCOS until proven otherwise
  • Most common cause of anovulatory infertility
  • Ultrasound findings are supportive, not diagnostic

Infertility

  • Inability to conceive after 12 months of regular, unprotected intercourse
  • After 6 months if the female is age 35 or older

Clinical Presentation

  • Failure to conceive despite regular intercourse
  • May have menstrual irregularities
  • History may suggest ovulatory, tubal, uterine, or male factor causes
  • Typical stem: couple trying to conceive for over a year asking what to evaluate first

Common Causes

  • Ovulatory dysfunction most common overall, especially PCOS
  • Tubal factor disease from prior PID or surgery
  • Uterine abnormalities such as fibroids or congenital anomalies
  • Male factor infertility accounts for a significant portion

Labs, Studies, and Imaging

  • Evaluate both partners
  • Assess ovulation through menstrual history and targeted hormone testing
  • Semen analysis is part of initial workup
  • Pelvic ultrasound if uterine or ovarian pathology suspected
  • Tubal evaluation if obstruction or prior infection suspected

Treatment

  • Management depends on underlying cause
  • Ovulation induction for anovulatory infertility
  • Treat endocrine disorders if present
  • Refer to reproductive endocrinology for advanced care

Exam Keys

  • PCOS is the most common cause of anovulatory infertility
  • Always evaluate both partners
  • Regular cycles suggest ovulation
  • Begin workup after 12 months, or 6 months if age 35 or older

Menopause

  • Permanent cessation of menstruation due to loss of ovarian follicular activity
  • Diagnosed retrospectively after 12 months of amenorrhea
  • Exam focus is distinguishing menopause from other causes and managing symptoms

Clinical Presentation

  • Irregular cycles progressing to amenorrhea
  • Vasomotor symptoms: hot flashes, night sweats
  • Sleep disturbance, mood changes
  • Vaginal dryness, dyspareunia
  • Typical stem: woman in late 40s or 50s with missed periods and hot flashes

Labs, Studies, and Imaging

  • Diagnosis is clinical in appropriate age group
  • FSH may be elevated but is not required
  • Pregnancy test if amenorrhea occurs earlier than expected
  • Further evaluation if symptoms are atypical or occur at a young age

Treatment

  • Symptom driven and optional
  • Lifestyle modification for mild symptoms:
    • Dressing in layers
    • Cool environment
    • Avoid triggers such as hot beverages, alcohol, spicy foods
    • Regular exercise and weight management
    • Sleep hygiene
  • Moderate to severe symptoms:
    • Systemic hormone therapy if no contraindications
    • Estrogen is primary agent
    • Add progestin if uterus present
    • Estrogen alone if no uterus
    • Local vaginal estrogen for isolated vaginal symptoms
    • Nonhormonal options include SSRIs, SNRIs, gabapentin

Contraindications to Hormone Therapy

  • History of breast cancer
  • History of endometrial cancer
  • Prior venous thromboembolism, stroke, myocardial infarction
  • Active liver disease
  • Unexplained vaginal bleeding

Exam Keys

  • Menopause is a clinical diagnosis
  • Hormone therapy is optional and symptom based
  • Estrogen treats symptoms; progestin protects the uterus
  • Local estrogen treats vaginal symptoms only
  • FSH testing usually unnecessary

Contraceptive Methods

  • Used for pregnancy prevention, cycle regulation, and symptom control
  • Exam focus is choosing the safest effective option
  • Most questions test estrogen risk, not brand names

How to Choose a Method

  • Estrogen safe and cycle control desired: combined hormonal method
  • Estrogen contraindicated: progestin-only method
  • Hormones contraindicated or declined: nonhormonal method

Combined Hormonal Contraceptives

  • Oral pills, patch, vaginal ring
  • Suppress ovulation and stabilize endometrium
  • Improve cycle regularity, dysmenorrhea, acne
  • Appropriate for healthy patients without estrogen risk

Progestin-Only Contraceptives

  • Progestin-only pills, depot medroxyprogesterone, implant, hormonal IUD
  • Thicken cervical mucus and variably suppress ovulation
  • Preferred when estrogen contraindicated
  • May cause irregular bleeding

Nonhormonal Contraceptives

  • Copper IUD (may increase bleeding and cramping)
  • Barrier methods
  • Permanent sterilization

Contraindications to Estrogen

  • History of venous thromboembolism
  • History of stroke or myocardial infarction
  • Migraine with aura
  • Estrogen-dependent malignancy
  • Active liver disease
  • Uncontrolled hypertension
  • Smoking over age 35

Fertility and Cycle Implications

  • Most methods are fully reversible
  • Fertility returns quickly after stopping most methods
  • Depot medroxyprogesterone may delay return to fertility
  • Hormonal contraception does not cause infertility

Exam Keys

  • Estrogen increases thrombotic risk
  • Migraine with aura is an absolute contraindication
  • Progestin-only methods safest when estrogen contraindicated
  • Copper IUD is nonhormonal and may worsen bleeding
  • Choose contraception based on safety first