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Published on: 8/20/2026

How can you tell the difference between endometriosis and PCOS?

Endometriosis and PCOS are two distinct conditions that can share overlapping symptoms, but they affect the body in very different ways.

  • Endometriosis is an inflammatory condition where tissue similar to the uterine lining grows outside the uterus, often causing pelvic pain and heavy periods.
  • PCOS (Polycystic Ovary Syndrome) is a hormonal disorder marked by enlarged ovaries with small cysts, irregular periods, and elevated androgen levels.

Because symptoms like irregular cycles, pelvic discomfort, and fertility challenges can appear in both, it's easy to confuse the two — yet the causes, diagnosis, and treatments differ significantly.

If you're experiencing symptoms and unsure what may be behind them, taking a free, instant, online symptom check can help you better understand your body, identify possible causes, and guide your next steps with confidence before seeing a doctor.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Endometriosis and polycystic ovary syndrome (PCOS) are two different conditions that can affect women, but they are not the same.

Endometriosis:

  • This condition occurs when tissue similar to the lining inside the uterus starts growing outside the uterus.
  • It can cause pain, especially during periods, and sometimes leads to fertility problems.
  • The pain is often severe and can occur in the pelvis, but it can also affect other areas of the body.

PCOS:

  • PCOS is a hormonal disorder where the ovaries become enlarged and contain small collections of fluid, called follicles, or cysts.
  • This condition can lead to irregular periods, excessive hair growth, acne, and obesity.
  • Women with PCOS may also have trouble getting pregnant.

Both conditions can sometimes occur together, but they have different causes and treatments. While endometriosis involves tissue growth outside the uterus, PCOS primarily involves hormonal imbalances affecting the ovaries. Understanding these differences is important for proper diagnosis and treatment. If you're experiencing symptoms related to either condition, try our free AI symptom checker to better understand what might be causing your discomfort and whether you should seek medical care.

(References)

  • Dinsdale NL, & Crespi BJ. (2021). Endometriosis and polycystic ovary syndrome are .... Evolutionary applications, 34295358.

  • Singh KB, Patel YC, & Wortsman J. (1989). Coexistence of polycystic ovary syndrome and pelvic .... Obstetrics and gynecology, 2797642.

  • Kirkegaard S, Uldall Torp NM, Andersen S, & Andersen SL. (2024). Endometriosis, polycystic ovary syndrome, and the thyroid. Endocrine connections, 38078917.

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