Chart — Maternal-Newborn
PCOS vs Endometriosis Comparison Chart
Two chronic gynecologic disorders that both threaten fertility but present oppositely: PCOS is hormones and metabolism (few periods, androgen excess, insulin resistance); endometriosis is pain (cyclic, progressive pelvic pain).
Educational use only. Diagnosis and treatment are provider-directed. This chart is educational background for nursing care. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Side by Side
| Feature | PCOS | Endometriosis |
|---|---|---|
| Core problem | Hormonal/metabolic: chronic anovulation + androgen excess, driven by insulin resistance | Endometrial-like tissue growing OUTSIDE the uterus → cyclic bleeding, inflammation, scarring |
| Hallmark presentation | Irregular/absent periods, hirsutism, acne, weight gain, acanthosis nigricans | Cyclic, progressive pelvic pain — dysmenorrhea, dyspareunia, dyschezia (the 'three D's') |
| Bleeding pattern | Oligomenorrhea/amenorrhea (too few periods) | Often painful, sometimes heavy periods; pain is the dominant symptom |
| Diagnosis | Clinical (Rotterdam: 2 of 3 — anovulation, hyperandrogenism, polycystic ovaries on US) | Definitive by laparoscopy with visualization/biopsy of lesions |
| Management focus | Weight loss/lifestyle, OCPs to regulate cycles, metformin for insulin resistance, ovulation induction for fertility | NSAIDs + hormonal suppression (OCPs, GnRH agonists), surgery for pain/fertility |
| Long-term risk | Type 2 diabetes, metabolic syndrome, endometrial cancer (unopposed estrogen) | Adhesions, chronic pain, infertility |
| Fertility | Impaired by anovulation — often improves with weight loss + ovulation induction | Impaired by adhesions/scarring — timing and surgery may help |
Exam Traps
- ✦PCOS = too FEW periods + androgen excess + insulin resistance; endometriosis = painful periods + cyclic pelvic pain.
- ✦PCOS is a clinical diagnosis (Rotterdam, 2 of 3); endometriosis is confirmed by laparoscopy.
- ✦Both impair fertility — don't tell a patient pregnancy is impossible.
- ✦PCOS anovulation = unopposed estrogen → endometrial cancer risk; regulating cycles protects the endometrium.
- ✦Endometriosis improves with pregnancy and menopause because they interrupt cyclic estrogen stimulation.
Related Resources
Standards & sources
Fact-checked Jun 20, 2026This page is written to align with American College of Obstetricians and Gynecologists (ACOG) · AWHONN · American Academy of Pediatrics (AAP) — newborn. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →