Menstrual Disorders — MCQs

Menstrual Disorders Indian Medical PG Practice Questions and MCQs

Question 111: Primary amenorrhoea is most commonly associated with which of the following?

A. Developmental defect of the genital tract
B. Tuberculosis
C. Endocrine disorders
D. Chromosomal abnormality (Correct Answer)

Explanation: **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).

Question 112: A 30-year-old woman, para 2+0, with hypertension presents with menorrhagia. What is the best treatment option for her?

A. Combined oral contraceptive pills
B. Levonorgestrel-releasing intrauterine system (Mirena) (Correct Answer)
C. Hysterectomy
D. Transcervical endometrial resection

Explanation: ### Explanation **Correct Answer: B. Levonorgestrel-releasing intrauterine system (Mirena)** **Why it is the correct choice:** The **Levonorgestrel-releasing intrauterine system (LNG-IUS)** is currently considered the **first-line medical management** for Heavy Menstrual Bleeding (HMB) according to NICE and FIGO guidelines. It works by releasing 20 mcg of levonorgestrel daily, causing profound endometrial atrophy and thickening of cervical mucus. In this specific case, the patient has **hypertension**. Estrogen-containing preparations are generally contraindicated or used with extreme caution in hypertensive patients due to the risk of stroke and thromboembolism. The LNG-IUS is a progestogen-only method, making it safe for women with cardiovascular risk factors while providing a 70–90% reduction in menstrual blood loss. **Why other options are incorrect:** * **A. Combined Oral Contraceptive Pills (COCPs):** These contain estrogen, which can further elevate blood pressure and increase the risk of cardiovascular events in a hypertensive patient. * **C. Hysterectomy:** This is a major surgical procedure and is considered the last resort when medical management and less invasive surgeries fail or when the patient has completed her family and specifically requests it. * **D. Transcervical Endometrial Resection (TCER):** This is a second-line surgical option for women who do not wish to conceive. Medical management (LNG-IUS) should always be attempted first unless contraindicated. **High-Yield Clinical Pearls for NEET-PG:** * **First-line for HMB:** LNG-IUS (Mirena). * **Mechanism:** Local endometrial atrophy (not inhibition of ovulation). * **Failure rate:** Comparable to tubal sterilization (Pearl Index ~0.2). * **Hypertension & Contraception:** Avoid Estrogen (COCPs); Progestogen-only methods (LNG-IUS, POPs, DMPA) are preferred. * **Non-hormonal first-line:** Tranexamic acid (Antifibrinolytic) is the preferred non-hormonal treatment for HMB.

Question 113: Which of the following is NOT a feature of anovulatory menstruation?

A. The only symptom may be failure of conception.
B. It is usually associated with painless periods.
C. May be associated with dysfunctional uterine bleeding (DUB).
D. May be associated with premenstrual syndrome. (Correct Answer)

Explanation: **Explanation:** The core concept to understand here is the relationship between **progesterone** and the menstrual cycle. Anovulatory cycles are characterized by the absence of ovulation, meaning no corpus luteum is formed and, consequently, no progesterone is produced. **Why Option D is the Correct Answer:** Premenstrual Syndrome (PMS) is strictly associated with **ovulatory cycles**. The symptoms of PMS occur during the luteal phase and are triggered by the hormonal fluctuations following ovulation (specifically the rise and fall of progesterone). In anovulatory cycles, there is no luteal phase and no progesterone production; therefore, PMS cannot occur. **Analysis of Other Options:** * **Option A:** In many women, anovulatory cycles are regular and mimic normal menses. In such cases, the inability to release an oocyte (infertility) may be the only presenting symptom. * **Option B:** Primary dysmenorrhea (painful periods) is caused by prostaglandins ($PGF_{2\alpha}$) produced by a secretory endometrium under the influence of progesterone. Since anovulatory cycles lack progesterone, the endometrium remains proliferative, and periods are typically **painless**. * **Option C:** Dysfunctional Uterine Bleeding (DUB), now classified under PALM-COEIN as AUB-O (Ovulatory dysfunction), is frequently caused by anovulation. Estrogen acts unopposed, leading to endometrial hyperplasia and irregular "estrogen breakthrough bleeding." **NEET-PG High-Yield Pearls:** 1. **Painless periods** in a young girl usually indicate anovulatory cycles (common in the first 1-2 years post-menarche). 2. **Basal Body Temperature (BBT):** Anovulatory cycles show a monophasic curve (no mid-cycle rise). 3. **Endometrial Biopsy:** In anovulatory cycles, the biopsy (taken on Day 21-23) will show a **proliferative** rather than a secretory pattern. 4. **Fern Test:** Persistent ferning throughout the cycle indicates anovulation (due to unopposed estrogen).

Question 114: Halba disease is related to which of the following?

A. Irregular shedding due to persistent corpus luteum (Correct Answer)
B. Irregular menstruation
C. Irregular ripening
D. Adenomatous polyp

Explanation: **Explanation:** **Halban’s Disease** (also known as Halban’s syndrome) refers to **irregular shedding of the endometrium** caused by a **persistent corpus luteum**. ### 1. Why Option A is Correct: Under normal physiological conditions, the corpus luteum regresses if pregnancy does not occur, leading to a drop in progesterone and subsequent menstruation. In Halban’s disease, the corpus luteum persists abnormally, continuing to secrete low levels of progesterone. This prevents the synchronous shedding of the endometrium. Instead, the endometrium sheds in patches over a prolonged period. * **Clinical Presentation:** Patients typically present with a short period of amenorrhea followed by prolonged, heavy, and irregular bleeding. * **Diagnosis:** Confirmed by a D&C (Dilatation and Curettage) performed on the 5th or 6th day of the cycle, which reveals a mixture of secretory and proliferative endometrium. ### 2. Why Other Options are Incorrect: * **Option B (Irregular menstruation):** This is a broad clinical symptom (metrorrhagia) rather than a specific pathological entity like Halban’s disease. * **Option C (Irregular ripening):** This is the opposite of irregular shedding. It is caused by **poor formation/function of the corpus luteum** (Luteal Phase Defect), leading to premature spotting before the period. * **Option D (Adenomatous polyp):** This is a structural/anatomical cause of bleeding, whereas Halban’s is a functional/hormonal disorder. ### 3. NEET-PG High-Yield Pearls: * **Key Histology:** The hallmark of irregular shedding is the presence of **secretory endometrium on the 5th day of menstruation** (normally, it should be proliferative by then). * **Differential Diagnosis:** Halban’s disease is a common mimic of **Ectopic Pregnancy** because both present with a period of amenorrhea, irregular bleeding, and a persistent corpus luteum (or adnexal mass). * **Treatment:** Progesterone therapy or D&C (which is often curative).

Question 115: 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?

A. Panhypopituitarism
B. Polycystic ovarian disease
C. Exogenous estrogen administration
D. Premature menopause (Correct Answer)

Explanation: ### **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.

Question 116: In dysmenorrhea, how does indomethacin exert its therapeutic effect?

A. Inhibiting prostaglandin synthetase (Correct Answer)
B. Suppressing ovulation
C. Reducing inflammation
D. Relaxing smooth muscle

Explanation: **Explanation:** **Primary Dysmenorrhea** is primarily caused by the excessive production of **Prostaglandins (specifically PGF2α and PGE2)** in the secretory endometrium. During menstruation, the breakdown of endometrial cells releases arachidonic acid, which is converted into prostaglandins via the cyclooxygenase (COX) pathway. High levels of PGF2α lead to potent uterine contractions, myometrial ischemia, and sensitization of nerve endings, resulting in pain. **Why Option A is Correct:** Indomethacin is a Non-Steroidal Anti-Inflammatory Drug (NSAID) that acts as a potent **inhibitor of prostaglandin synthetase (COX enzyme)**. By blocking this enzyme, it reduces the synthesis of PGF2α, thereby decreasing intrauterine pressure and alleviating menstrual cramps. **Why Other Options are Incorrect:** * **B. Suppressing ovulation:** While Combined Oral Contraceptive Pills (OCPs) work by suppressing ovulation (which prevents the formation of a secretory endometrium and reduces prostaglandin levels), NSAIDs like indomethacin do not interfere with the hypothalamic-pituitary-ovarian axis. * **C. Reducing inflammation:** Although indomethacin has anti-inflammatory properties, the primary mechanism in *dysmenorrhea* is the specific reduction of prostaglandin-induced uterine hypercontractility, not the resolution of a systemic inflammatory process. * **D. Relaxing smooth muscle:** While the end result is reduced contraction, indomethacin is not a direct myometrial relaxant (like Tocolytics); it works upstream by removing the stimulus (prostaglandins) that causes the contraction. **High-Yield NEET-PG Pearls:** * **First-line treatment** for primary dysmenorrhea: NSAIDs (Mefenamic acid is often preferred due to dual action: inhibiting synthesis and blocking PG receptors). * **Timing:** NSAIDs are most effective if started 1–2 days before the onset of menses or at the very first sign of pain. * **Secondary Dysmenorrhea:** If NSAIDs fail to provide relief, clinicians should investigate for underlying pathology like **Endometriosis** (most common cause) or Adenomyosis.

Question 117: All of the following conditions present with secondary amenorrhoea EXCEPT:

A. Pregnancy
B. PCOD
C. Asherman's syndrome
D. Turner syndrome (Correct Answer)

Explanation: ### 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.

Question 118: 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?

A. Endometrial sampling to rule out neoplasia.
B. Change over to progestin-only preparations.
C. Reassure the patient as this is breakthrough bleeding. (Correct Answer)
D. Discontinue oral contraceptive pills.

Explanation: **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.

Question 119: What is the most common cause of pubertal menorrhagia?

A. Anovulation (Correct Answer)
B. Malignancy
C. Endometriosis
D. Bleeding disorder

Explanation: **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).

Question 120: What is the most common cause of secondary amenorrhea?

A. Pregnancy (Correct Answer)
B. Tuberculosis
C. Thyrotoxicosis
D. None of the above

Explanation: **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).

Practice by Chapter

Normal Menstrual Physiology

Practice Questions

Primary Dysmenorrhea

Practice Questions

Secondary Dysmenorrhea

Practice Questions

Premenstrual Syndrome and PMDD

Practice Questions

Primary Amenorrhea

Practice Questions

Secondary Amenorrhea

Practice Questions

Polycystic Ovary Syndrome

Practice Questions

Abnormal Uterine Bleeding: Classification

Practice Questions

Evaluation of Menstrual Disorders

Practice Questions

Management Approaches to Menstrual Disorders

Practice Questions

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