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Understanding Gynecologic Bleeding (Abnormal Uterine Bleeding)

What is Gynecologic bleeding (abnormal uterine bleeding)?

Gynecologic bleeding, commonly referred to as abnormal uterine bleeding (AUB), is any alteration in the pattern, volume, or timing of menstrual bleeding that deviates from a woman’s normal cycle. This includes:

• Bleeding that is heavier or lighter than usual
• Bleeding that occurs at irregular intervals (e.g., between periods)
• Bleeding that lasts longer than 7‑8 days or stops suddenly
• Bleeding after menopause

The condition is not a disease itself; rather, it is a symptom that may arise from a wide range of hormonal, structural, or systemic problems. Because the uterus is central to reproductive health, any abnormal bleeding warrants careful evaluation.

Common Causes

More than 30 distinct conditions can lead to AUB. The most frequent etiologies are grouped using the PALM‑COEIN classification (Structural vs. Non‑structural causes). Below are 10 common causes:

• Polycystic Ovary Syndrome (PCOS) – Hormonal imbalance causing anovulatory cycles and irregular, often heavy bleeding.<sup>1</sup>
• Leiomyomas (Uterine Fibroids) – Benign smooth‑muscle tumors that distort the uterine cavity and increase flow.
• Endometrial Polyps – Small growths in the uterine lining that can cause spotting or heavy bleeding.
• Adenomyosis – Endometrial tissue grows into the uterine muscle, leading to painful, prolonged periods.
• Coagulopathies – Blood‑clotting disorders such as von Willebrand disease or platelet function defects.<sup>2</sup>
• Thyroid Dysfunction – Both hypothyroidism and hyperthyroidism can disrupt menstrual regularity.
• Medications – Hormonal contraceptives (especially progestin‑only), anticoagulants, and some antiplatelet drugs.
• Intrauterine Device (IUD) Complications – Particularly copper IUDs, which may increase spotting.
• Endometrial Hyperplasia or Cancer – Abnormal growth of the uterine lining that often presents with irregular bleeding, especially after menopause.
• Pregnancy‑related Issues – Implantation bleeding, miscarriage, or ectopic pregnancy can masquerade as abnormal bleeding.

Associated Symptoms

While the primary complaint is bleeding, many women experience additional signs that help clinicians narrow the cause:

• Pelvic pain or cramping (common with fibroids, adenomyosis, or endometriosis)
• Feeling of pressure or fullness in the lower abdomen
• Fatigue or shortness of breath due to anemia
• Unexplained weight gain or loss (thyroid disorders, PCOS)
• Acne, excess hair growth, or hair thinning (hormonal imbalances)
• Spotting after intercourse
• Fever or chills (suggest infection such as pelvic inflammatory disease)
• Infertility or difficulty conceiving

When to See a Doctor

Most episodes of irregular bleeding can be evaluated in a primary‑care or OB‑GYN office, but certain patterns merit prompt attention:

• Bleeding that lasts longer than 2 weeks or recurs frequently
• Soaking through a pad or tampon every hour for several consecutive hours
• Bleeding after menopause (any post‑menopausal bleeding is abnormal)
• Accompanying severe pelvic pain, fever, or foul‑smelling discharge
• Signs of anemia: dizziness, rapid heart rate, shortness of breath, or pale skin
• Sudden, heavy bleeding after a change in medication or contraceptive method

Early evaluation can prevent complications such as severe anemia, infertility, or delayed diagnosis of malignancy.

Diagnosis

Diagnosing AUB involves a systematic approach that combines a thorough history, physical examination, and targeted investigations.

1. Medical History & Physical Exam

• Menstrual pattern (cycle length, flow, duration)
• Medication list (including over‑the‑counter supplements)
• Pregnancy status – urine or serum hCG test
• Family history of bleeding disorders or gynecologic cancers
• Pelvic examination – looking for fibroids, polyps, cervical lesions

2. Laboratory Tests

• Complete blood count (CBC) – assesses anemia and platelet count
• Thyroid‑stimulating hormone (TSH) – screens for hypo‑/hyper‑thyroidism
• Coagulation profile (PT/INR, aPTT) and von Willebrand factor if a bleeding disorder is suspected
• Hormone panel (estradiol, progesterone, prolactin) in selected cases

3. Imaging

• Transvaginal ultrasound – first‑line for evaluating fibroids, polyps, and endometrial thickness.
• Saline‑infusion sonohysterography – better delineates intracavitary lesions.
• MRI – reserved for complex cases (e.g., deep infiltrating adenomyosis).

4. Endometrial Sampling

If the endometrial lining is >4–5 mm in a woman >45 years or any post‑menopausal patient, an endometrial biopsy (office pipelle) or hysteroscopic directed curettage is recommended to rule out hyperplasia or cancer.<sup>3</sup>

5. Additional Procedures

• Hysteroscopy – direct visualization and removal of polyps/fibroids.
• Laparoscopy – evaluates extra‑uterine causes such as endometriosis.

Treatment Options

Treatment is individualized based on the underlying cause, severity of bleeding, desire for future fertility, and patient preferences.

Medical Management

• Hormonal therapy
  • Combined oral contraceptives (COCs) – regulate cycle and reduce flow.
  • Progestin‑only pills, injectable medroxyprogesterone acetate, or the levonorgestrel‑releasing intrauterine system (LNG‑IUS) – especially effective for anovulatory bleeding.
• Tranexamic acid – antifibrinolytic that decreases menstrual blood loss by up to 50 % when taken during bleeding days.<sup>4</sup>
• Non‑steroidal anti‑inflammatory drugs (NSAIDs) – reduce prostaglandin‑mediated bleeding and provide pain relief.
• Gonadotropin‑releasing hormone (GnRH) agonists – temporarily induce a hypo‑estrogenic state; used before surgery for large fibroids.
• Selective progesterone receptor modulators (SPRMs) – e.g., ulipristal acetate for fibroid‑related bleeding (available in some countries).

Surgical & Procedural Options

• Endometrial ablation – destroys the uterine lining; suitable for women who have completed childbearing.
• Myomectomy – removal of fibroids while preserving the uterus; can be hysteroscopic, laparoscopic, or open.
• Hysteroscopic polypectomy – excision of endometrial polyps.
• Hysterectomy – definitive treatment for refractory bleeding; considered when other measures fail and fertility is not desired.
• Uterine artery embolization (UAE) – minimally invasive radiologic procedure that shrinks fibroids and reduces bleeding.

Home & Lifestyle Measures

• Track menstrual cycles with an app or diary to identify patterns.
• Maintain a balanced diet rich in iron (red meat, leafy greens, legumes) and consider an iron supplement if labs show deficiency.
• Stay hydrated and practice regular moderate exercise, which can improve hormonal balance.
• Limit caffeine and alcohol, as they may exacerbate bleeding in some women.

Prevention Tips

While not all causes of AUB are preventable, several strategies may reduce the likelihood of abnormal bleeding:

• Attend regular gynecologic exams (annually for most women; more often if you have risk factors).
• Manage chronic conditions—keep thyroid disease, diabetes, and hypertension well‑controlled.
• Use hormonal contraception consistently and discuss any side‑effects with your provider.
• Maintain a healthy weight; obesity contributes to estrogen excess and PCOS.
• Avoid smoking, which can worsen vascular fragility and interfere with hormone metabolism.
• If you have a known bleeding disorder, work with a hematologist to develop a bleeding‑management plan before surgeries or dental procedures.

Emergency Warning Signs

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Key Take‑aways

• Abnormal uterine bleeding is a symptom, not a disease; it signals an underlying hormonal, structural, or systemic issue.
• Common causes include fibroids, polyps, hormonal imbalances (PCOS, thyroid), coagulopathies, and malignancy.
• A thorough history, pelvic exam, labs, and imaging guide diagnosis; endometrial sampling is crucial in women over 45 or post‑menopausal.
• Most cases are managed medically (hormonal therapy, tranexamic acid, NSAIDs) while surgical options are reserved for refractory or structural problems.
• Prompt evaluation of heavy or prolonged bleeding prevents anemia and helps rule out serious conditions like cancer.

For personalized advice, always discuss symptoms and treatment options with a qualified health professional.

References

1. Mayo Clinic. Polycystic Ovary Syndrome (PCOS). https://www.mayoclinic.org
2. Cleveland Clinic. Abnormal Uterine Bleeding: Causes & Treatment. https://my.clevelandclinic.org
3. American College of Obstetricians and Gynecologists (ACOG). Practice Bulletin No. 136: Endometrial Hyperplasia. https://www.acog.org
4. World Health Organization. Tranexamic Acid for Heavy Menstrual Bleeding. WHO Model List of Essential Medicines, 2023.

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