Menstrual Disorders Practice Questions

Q: Primary amenorrhoea is most commonly associated with which of the following?

Chromosomal abnormality. **Explanation:** The most common cause of **Primary Amenorrhoea** is **Chromosomal Abnormality**, accounting for approximately **45-50%** of cases. Among these, **Turner Syndrome (45,XO)** is the single most frequent etiology. These abnormalities lead to gonadal dysgenesis, where ovaries are replaced by non-functional fibrous streaks, resulting in hypergonadotropic hypogonadism (low estrogen, high FSH/LH). **Analysis of Options:** * **A. Developmental defect of the genital tract:** This is the second most common cause (approx. 15-20%). The most frequent defect is **Müllerian Agenesis** (Mayer-Rokitansky-Küster-Hauser syndrome), characterized by the absence of the uterus and upper vagina despite normal ovaries and secondary sexual characteristics. * **B. Tuberculosis:** While Genital TB is a significant cause of *secondary* amenorrhoea in developing countries (due to Asherman’s syndrome), it rarely presents as primary amenorrhoea unless the infection occurs prepubertally and causes extensive endo-myometrial destruction. * **C. Endocrine disorders:** Conditions like PCOS, thyroid dysfunction, or Congenital Adrenal Hyperplasia (CAH) can cause primary amenorrhoea, but statistically, they occur less frequently than chromosomal or structural defects. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Absence of menarche by age 13 (without secondary sexual characteristics) or age 15 (with secondary sexual characteristics). * **First Investigation:** The most important initial step is assessing for the presence or absence of **secondary sexual characteristics** (Breast development/Tanner Staging). * **Karyotyping:** Essential if FSH is elevated (to diagnose Turner’s) or if there is Müllerian agenesis (to rule out Androgen Insensitivity Syndrome - 46,XY). * **Most common cause of Secondary Amenorrhoea:** Pregnancy (Physiological); PCOS (Pathological).

Q: A 35-year-old lady has not had her menses for the last 4 months. She has high serum FSH and LH levels with low estradiol. What is the likely cause?

Premature menopause. ### **Explanation** The clinical presentation of secondary amenorrhea (4 months) associated with **high gonadotropins (FSH and LH)** and **low estradiol** indicates **Hypergonadotropic Hypogonadism**. **1. Why Premature Menopause is Correct:** Premature menopause, or Premature Ovarian Insufficiency (POI), occurs when ovarian follicles are depleted or dysfunctional before age 40. In this state, the ovaries fail to produce estradiol. The lack of negative feedback from estradiol on the HPO axis leads to a compensatory rise in FSH and LH from the anterior pituitary. A serum **FSH level >40 IU/L** on two occasions is the diagnostic hallmark. **2. Analysis of Incorrect Options:** * **Panhypopituitarism:** This results in *Hypogonadotropic Hypogonadism*. Both FSH/LH and estradiol would be low because the pituitary fails to secrete gonadotropins. * **Polycystic Ovarian Disease (PCOS):** Characterized by an increased LH:FSH ratio (often 2:1 or 3:1) and normal or elevated estrogen levels. FSH is typically normal or low-normal, not high. * **Exogenous Estrogen Administration:** High levels of exogenous estrogen would exert negative feedback on the pituitary, resulting in **low** FSH and LH levels. **3. NEET-PG High-Yield Pearls:** * **Definition:** Menopause before age 40 is Premature Ovarian Insufficiency; before age 45 is Early Menopause. * **Most common chromosomal cause:** Turner Syndrome (45,X) or Mosaicism. * **Most common reversible cause:** Autoimmune oophoritis. * **Kariotype:** Mandatory in all women with POI under age 30 to rule out Y-chromosome material (risk of gonadoblastoma). * **Management:** Hormone Replacement Therapy (HRT) is essential until the natural age of menopause (approx. 50 years) to prevent osteoporosis and cardiovascular disease.

Q: All of the following conditions present with secondary amenorrhoea EXCEPT:

Turner syndrome. ### Explanation **Core Concept: Primary vs. Secondary Amenorrhoea** The distinction lies in the timing of onset. **Primary amenorrhoea** is the failure to start menses by age 15 (with secondary sexual characteristics) or age 13 (without them). **Secondary amenorrhoea** is the cessation of previously established menses for ≥3 months (regular cycles) or ≥6 months (irregular cycles). **Why Turner Syndrome (Option D) is the Correct Answer:** Turner Syndrome (45, XO) is the most common cause of **primary amenorrhoea**. It is characterized by gonadal dysgenesis (streak ovaries) due to accelerated oocyte atresia. Since these patients typically never achieve menarche, it is classified as primary amenorrhoea. *Note: Rarely, mosaic Turner (45,X/46,XX) can present with secondary amenorrhoea, but in the context of competitive exams, it is the classic prototype for primary amenorrhoea.* **Analysis of Incorrect Options:** * **A. Pregnancy:** The most common cause of secondary amenorrhoea worldwide. It must always be ruled out first with a UPT. * **B. PCOD (Polycystic Ovarian Disease):** A common endocrine cause of secondary amenorrhoea/oligomenorrhoea due to chronic anovulation and hyperandrogenism. * **C. Asherman’s Syndrome:** An outflow tract cause where intrauterine adhesions (usually post-curettage) prevent menstruation despite normal hormonal axes. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of Primary Amenorrhoea:** Turner Syndrome (Hypergonadotropic Hypogonadism). * **Most common cause of Secondary Amenorrhoea:** Pregnancy (Physiological). * **Most common pathological cause of Secondary Amenorrhoea:** PCOD. * **Kallmann Syndrome:** A key differential for primary amenorrhoea presenting with **anosmia** (Hypogonadotropic Hypogonadism). * **Mullerian Agenesis (MRKH):** Second most common cause of primary amenorrhoea; characterized by 46,XX karyotype and normal ovaries but absent uterus/vagina.

Q: A 28-year-old female presents with irregular slight bleeding after taking combined oral contraceptive pills for three months to manage heavy menstrual bleeding. What is your advice?

Reassure the patient as this is breakthrough bleeding.. **Explanation:** **1. Why Option C is Correct:** The patient is experiencing **breakthrough bleeding (BTB)**, which is the most common side effect of Combined Oral Contraceptive Pills (COCPs), especially during the first **3–6 months** of use. This occurs because the exogenous hormones cause the endometrium to become thin and fragile, leading to asynchronous breakdown and spotting. Since the patient has only been on the pills for three months, the initial management is **reassurance and observation**, as this side effect usually resolves spontaneously once the endometrium stabilizes. **2. Why Other Options are Incorrect:** * **Option A:** Endometrial sampling is generally reserved for women >35 years or those with persistent abnormal uterine bleeding (AUB) despite medical therapy. In a 28-year-old with a clear pharmacological cause (COCP initiation), neoplasia is highly unlikely. * **Option B:** Progestin-only preparations (POPs) are actually *more* likely to cause irregular spotting and breakthrough bleeding compared to COCPs due to the lack of estrogen-induced endometrial stabilization. * **Option D:** Discontinuing the pills is unnecessary and would lead to the return of her original complaint (heavy menstrual bleeding) and loss of contraceptive protection. **Clinical Pearls for NEET-PG:** * **Breakthrough Bleeding (BTB):** Most common in the first 3 cycles. * **Management of persistent BTB:** If bleeding persists beyond 3 months, the dose of estrogen can be increased or the type of progestin changed. * **Early vs. Late Cycle Bleeding:** * Bleeding in the **early/follicular phase** suggests estrogen deficiency (increase estrogen). * Bleeding in the **late/luteal phase** suggests progestin deficiency (increase progestin). * **Most common cause of BTB:** Missing a pill (non-compliance). Always rule this out first in clinical practice.

Q: What is the most common cause of pubertal menorrhagia?

Anovulation. **Explanation:** **1. Why Anovulation is the Correct Answer:** Pubertal menorrhagia refers to excessive menstrual bleeding occurring between menarche and 19 years of age. The most common cause is an **immature Hypothalamic-Pituitary-Ovarian (HPO) axis**. In the first few years following menarche, the feedback mechanism is not fully developed, leading to **anovulatory cycles**. Without ovulation, there is no corpus luteum formation and no progesterone production. This results in "unopposed estrogen" action, causing the endometrium to proliferate excessively. Eventually, this thickened lining becomes unstable and sheds in an irregular, heavy, and prolonged manner (estrogen breakthrough bleeding). **2. Analysis of Incorrect Options:** * **Malignancy:** Extremely rare in the adolescent age group. Genital tract cancers (like cervical or endometrial cancer) typically present in postmenopausal or older reproductive-age women. * **Endometriosis:** Usually presents with chronic pelvic pain and secondary dysmenorrhea rather than heavy menstrual bleeding (menorrhagia). * **Bleeding Disorders:** While **Von Willebrand Disease (vWD)** is the most common *systemic* or *organic* cause of pubertal menorrhagia (found in up to 20% of severe cases), it is still statistically less common than physiological anovulation. **3. NEET-PG High-Yield Pearls:** * **First-line investigation:** Pelvic Ultrasound (to rule out structural causes) and CBC (to assess anemia). * **Management:** Most cases are managed with reassurance or Combined Oral Contraceptive Pills (COCPs) to stabilize the endometrium. * **Rule of Thumb:** If a teenager presents with menorrhagia requiring hospitalization or blood transfusion from the very first period (menarche), always suspect a **coagulation disorder** (vWD).

Q: What is the most common cause of secondary amenorrhea?

Pregnancy. **Explanation:** **1. Why Pregnancy is the Correct Answer:** Secondary amenorrhea is defined as the absence of menses for 3 months in a woman with previously regular cycles, or 6 months in those with irregular cycles. In any woman of reproductive age presenting with a cessation of menses, **pregnancy** is the most common physiological cause and must be ruled out first using a urine pregnancy test (hCG). It is the single most frequent reason for secondary amenorrhea globally. **2. Analysis of Incorrect Options:** * **B. Tuberculosis:** Genital tuberculosis is a significant cause of secondary amenorrhea in developing countries (leading to Asherman’s syndrome or endometrial destruction), but it is far less common than pregnancy. * **C. Thyrotoxicosis:** While thyroid dysfunctions (both hyper- and hypothyroidism) can cause menstrual irregularities, they typically present more frequently with oligomenorrhea or polymenorrhea rather than complete amenorrhea. * **D. None of the above:** Incorrect, as pregnancy is the established primary cause. **3. NEET-PG High-Yield Clinical Pearls:** * **Step 1 Investigation:** The first investigation for secondary amenorrhea is always a **Urine Pregnancy Test**. * **Most Common Pathological Cause:** Polycystic Ovary Syndrome (PCOS) is the most common *pathological* cause of secondary amenorrhea. * **Asherman’s Syndrome:** This is the most common *uterine* cause of secondary amenorrhea, often following over-zealous curettage or TB endometritis. * **Premature Ovarian Failure (POF):** Defined as menopause occurring before the age of 40; it is a common hypergonadotropic cause. * **Progesterone Challenge Test:** Used to assess endogenous estrogen levels and outflow tract patency; a positive bleed indicates anovulation (commonly seen in PCOS).

Question 1

Primary amenorrhoea is most commonly associated with which of the following?

Accepted Answer

Chromosomal abnormality

Answer

Developmental defect of the genital tract

Answer

Tuberculosis

Answer

Endocrine disorders

Question 2

A 30-year-old woman, para 2+0, with hypertension presents with menorrhagia. What is the best treatment option for her?

Accepted Answer

Levonorgestrel-releasing intrauterine system (Mirena)

Answer

Combined oral contraceptive pills

Answer

Hysterectomy

Answer

Transcervical endometrial resection

Question 3

Which of the following is NOT a feature of anovulatory menstruation?

Accepted Answer

May be associated with premenstrual syndrome.

Answer

The only symptom may be failure of conception.

Answer

It is usually associated with painless periods.

Answer

May be associated with dysfunctional uterine bleeding (DUB).

Question 4

Halba disease is related to which of the following?

Accepted Answer

Irregular shedding due to persistent corpus luteum

Answer

Irregular menstruation

Answer

Irregular ripening

Answer

Adenomatous polyp

Question 5

A 35-year-old lady has not had her menses for the last 4 months. She has high serum FSH and LH levels with low estradiol. What is the likely cause?

Accepted Answer

Premature menopause

Answer

Panhypopituitarism

Answer

Polycystic ovarian disease

Answer

Exogenous estrogen administration

Question 6

In dysmenorrhea, how does indomethacin exert its therapeutic effect?

Accepted Answer

Inhibiting prostaglandin synthetase

Answer

Suppressing ovulation

Answer

Reducing inflammation

Answer

Relaxing smooth muscle

Question 7

All of the following conditions present with secondary amenorrhoea EXCEPT:

Accepted Answer

Turner syndrome

Answer

Pregnancy

Answer

PCOD

Answer

Asherman's syndrome

Question 8

A 28-year-old female presents with irregular slight bleeding after taking combined oral contraceptive pills for three months to manage heavy menstrual bleeding. What is your advice?

Accepted Answer

Reassure the patient as this is breakthrough bleeding.

Answer

Endometrial sampling to rule out neoplasia.

Answer

Change over to progestin-only preparations.

Answer

Discontinue oral contraceptive pills.

Question 9

What is the most common cause of pubertal menorrhagia?

Accepted Answer

Anovulation

Answer

Malignancy

Answer

Endometriosis

Answer

Bleeding disorder

Question 10

What is the most common cause of secondary amenorrhea?

Accepted Answer

Pregnancy

Answer

Tuberculosis

Answer

Thyrotoxicosis

Answer

None of the above

Menstrual Disorders — MCQs

Menstrual Disorders — MCQs

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