What are the differential diagnoses for heavy menstrual bleeding with clots in a reproductive‑age woman?

Differential Diagnosis for Heavy Menstrual Bleeding with Clots

Use the PALM-COEIN classification system to systematically evaluate all potential causes of heavy menstrual bleeding with clots in reproductive-age women. 1

Structural Causes (PALM)

P - Polyp (Endometrial)

• Endometrial polyps are common structural sources of abnormal uterine bleeding in premenopausal women 1
• More prevalent in women over 40 years of age 2
• Best diagnosed with saline infusion sonohysterography (sensitivity 96-100%) or hysteroscopy rather than endometrial biopsy alone 1, 3

A - Adenomyosis

• Common structural cause of heavy menstrual bleeding in reproductive-age women 1
• Can cause incomplete visualization on transvaginal ultrasound, requiring MRI for definitive diagnosis 1
• Frequently coexists with other pathology 4

L - Leiomyoma (Fibroids)

• Most common cause in women under 40 years of age 2
• Submucous leiomyomas are particularly associated with heavy bleeding 1, 5
• May be asymptomatic even when present, so correlation with symptoms is essential 4

M - Malignancy and Hyperplasia

• Endometrial or myometrial malignancy must be considered 1
• Critical: Any abnormal uterine bleeding in perimenopausal or postmenopausal women should be considered malignancy until proven otherwise 5
• Cervical, vaginal, vulvar, and oviduct malignancies also possible 5
• Granulosa theca cell ovarian tumors can cause bleeding 5

Nonstructural Causes (COEIN)

C - Coagulopathy

• Von Willebrand disease and other coagulation disorders are more common than many physicians realize 5, 6
• Critical: Menorrhagia in adolescents should be attributed to coagulopathy until proven otherwise 5
• Heavy menstrual bleeding affects ~90% of women with underlying bleeding disorders 6
• Predictive features include clots ≥1 inch diameter, flooding (changing pad/tampon more than hourly), and low ferritin 6
• Screen for coagulopathy in: adolescents with menorrhagia, women with high-risk bleeding history, those failing medical/surgical therapy, and women with ovulatory dysfunction without anatomic lesions 5

O - Ovulatory Dysfunction

• Includes oligo-ovulation and anovulation causing heavy, irregular bleeding 1
• Causes include: adolescence, perimenopause, lactation, pregnancy, hyperandrogenic conditions (PCOS), hypothalamic dysfunction, hyperprolactinemia, thyroid disease, primary pituitary disease, premature ovarian failure, iatrogenic causes, and medications 1
• Requires assessment of thyroid-stimulating hormone and prolactin levels 1

E - Endometrial

• Primary endometrial disorders including molecular deficiencies in regulation of endometrial hemostasis 1
• Endometritis and other infections 5

I - Iatrogenic

• Exogenous gonadal steroids and intrauterine devices 1
• Anticoagulation therapy causes heavy menstrual bleeding in ~70% of women 6
• Other medications: hypothalamic depressants, digitalis, phenytoin 5

N - Not Yet Classified

• Other causes not fitting above categories 1
• Systemic diseases: hypothyroidism, cirrhosis 5
• Traumatic lesions, foreign bodies, cervical erosion, cervicitis 5

Critical Diagnostic Priorities

First, exclude pregnancy-related causes in all reproductive-age women—complications of pregnancy (threatened/incomplete/missed abortion, ectopic pregnancy, trophoblastic disease, placental polyp, subinvolution of placental site) must be ruled out immediately. 1, 5

High-Risk Red Flags Requiring Urgent Evaluation:

• Personal or family history of bleeding disorders with flooding/prolonged menses → immediate hematology referral 6
• Perimenopausal/postmenopausal age → assume malignancy until excluded 5
• Adolescent with menorrhagia → assume coagulopathy until excluded 5
• Severe anemia or hemodynamic instability 6