Endometriosis vs. PCOS: What’s the Difference?
Endometriosis and polycystic ovary syndrome (PCOS) are two of the most common reproductive health conditions affecting people assigned female at birth. Although some symptoms overlap, these conditions differ significantly in causes, diagnosis, and treatment. Understanding these differences is key to getting the right support and care.
What Is Endometriosis?
Endometriosis is a chronic inflammatory condition where tissue similar to the lining of the uterus (called the endometrium) grows outside the uterus. These growths can occur on the ovaries, fallopian tubes, bladder, bowel, and other organs. Each menstrual cycle, this tissue behaves like it’s inside the uterus — thickening, breaking down, and bleeding — but since it has no way to leave the body, it causes inflammation, pain, and scar tissue.
Common symptoms include:
- Chronic pelvic pain
- Painful periods (dysmenorrhea)
- Pain during or after sex
- Digestive issues
- Fatigue
- Infertility
Reference: World Health Organization (2021). Endometriosis fact sheet
What Is PCOS?
Polycystic ovary syndrome (PCOS) is a hormonal disorder marked by elevated levels of androgens (male hormones) and irregular ovulation. Despite the name, not everyone with PCOS has ovarian cysts. PCOS affects how the ovaries function and is often linked to insulin resistance and metabolic issues.
Common symptoms include:
- Irregular or absent periods
- Excess facial or body hair (hirsutism)
- Acne
- Weight gain or difficulty losing weight
- Thinning hair or scalp hair loss
- Fertility problems
Reference: National Health Service (NHS), 2023. Polycystic ovary syndrome (PCOS)
Key Differences
| Feature | Endometriosis | PCOS |
|---|---|---|
| Cause | Endometrial-like tissue outside uterus | Hormonal imbalance (high androgens, insulin) |
| Periods | Painful, heavy, often regular | Irregular or absent |
| Pain | Chronic pelvic pain common | Not always present |
| Fertility | Can cause scarring, blocked fallopian tubes | Can affect ovulation and egg release |
| Hormones | Typically normal hormone levels | Elevated androgens, insulin resistance |
| Diagnosis | Often requires laparoscopy | Blood tests, symptoms, ultrasound |
Can Someone Have Both?
Yes. It’s possible to have both endometriosis and PCOS simultaneously, which can complicate diagnosis and treatment. If you suspect symptoms of either or both, consult a healthcare professional experienced in reproductive health.
Why It Matters
Both conditions are often misunderstood or misdiagnosed, leading to delays in proper care. Accurate diagnosis is crucial for effective management, which may include hormonal treatments, surgery, lifestyle changes, or fertility support.
Final Thoughts
Endometriosis and PCOS can both significantly impact quality of life, but they are very different conditions. Increasing awareness about their differences helps more people get the right diagnosis earlier and access appropriate treatment.
