PCOS vs Endometriosis: Key Differences, and Treatments

Jun 20, 2024 | 6 min read

Question on this topic? Get an instant answer from AI Doctor.Instant answer from AI Doctor.

PCOS and endometriosis are distinct conditions affecting women's reproductive health. While PCOS is a hormonal disorder leading to irregular cycles and insulin resistance, endometriosis involves the growth of uterine-like tissue outside the uterus, causing chronic pelvic pain and infertility.

pcos vs endometriosis

Understanding PCOS

What is PCOS?

Polycystic Ovary Syndrome (PCOS) is a common hormonal disorder affecting women of reproductive age. It involves an imbalance in the levels of androgens, estrogen, and progesterone. This imbalance interferes with the normal function of the ovaries, leading to various symptoms and health issues. In PCOS, the ovaries may develop numerous small cysts (fluid-filled sacs), which can prevent them from functioning correctly.

Hormonal Basis of PCOS:

  • Androgens: Often termed as "male hormones," androgens are present in women in small amounts. Women with PCOS have higher levels of androgens, which can disrupt the menstrual cycle and cause other symptoms.
  • Insulin: Many women with PCOS have insulin resistance, meaning their bodies do not respond well to insulin. This condition can lead to higher insulin levels, which may increase androgen production and worsen PCOS symptoms.

Common Symptoms of PCOS

1. Irregular menstrual cycles

2. Elevated androgen levels, which can cause:

  • Excess facial and body hair growth (hirsutism)
  • Severe acne
  • Thinning hair or male-pattern baldness

3. Insulin resistance, leading to:

  • Increased risk of Type 2 diabetes
  • Weight gain or difficulty losing weight
  • Skin tags or dark, thick patches of skin (acanthosis nigricans)

4. Polycystic ovaries: Enlarged ovaries containing many small cysts

Potential Complications

  • Type 2 Diabetes: Due to insulin resistance, women with PCOS are at a higher risk of developing Type 2 diabetes.
  • Obesity: Weight gain is common, and managing weight can be challenging, further exacerbating insulin resistance and other symptoms.
  • Infertility: PCOS is one of the leading causes of infertility due to irregular ovulation or anovulation (absence of ovulation).
  • Cardiovascular Issues: Increased risk of high blood pressure, high cholesterol, and heart disease.
  • Sleep Apnea: Obesity and insulin resistance can contribute to sleep apnea.

Understanding Endometriosis

What is Endometriosis?

Endometriosis is a condition where tissue similar to the lining inside the uterus, known as endometrial tissue, grows outside the uterus. This tissue can attach to the ovaries, fallopian tubes, and other parts of the pelvic cavity. Unlike the endometrial tissue inside the uterus, which sheds during menstruation, this misplaced tissue has no way to exit the body, leading to inflammation, pain, and the formation of scar tissue.

Common Symptoms of Endometriosis

  • Painful periods (dysmenorrhea): Severe menstrual cramps that can begin before and extend several days into the period.
  • Heavy bleeding: Excessive menstrual bleeding or bleeding between periods.
  • Pain during intercourse: Often experienced during or after sexual activity.
  • Pain with bowel movements or urination: Typically occurring during menstrual periods.
  • Infertility: Endometriosis is often first diagnosed in those seeking treatment for infertility.
  • Other symptoms may include fatigue, diarrhea, constipation, bloating, and nausea, especially during menstrual periods.

Impact on Fertility and Development of Scar Tissue

Endometriosis can significantly impact fertility. The inflammation and scar tissue (adhesions) caused by endometrial implants can distort pelvic anatomy and impair the function of the ovaries, fallopian tubes, and uterus. This can make it difficult for the egg to be released, fertilized, or implanted in the uterus. In severe cases, endometriosis can cause blockage of the fallopian tubes.

Comparing Symptoms of PCOS and Endometriosis

Symptom PCOS Endometriosis
Irregular Menstrual Cycles + +
Heavy Bleeding + +
Painful Periods - +
Infertility + +
Excess Hair Growth (Hirsutism) + -
Severe Acne + -
Thinning Hair + -
Chronic Pelvic Pain - +
Pain During Intercourse - +
Painful Bowel Movements or Urination - +
Ovarian Cysts + -
Weight Gain + -
Insulin Resistance + -

If you are not sure about your symptoms, use Symptom Checker for Women to help identify your symptoms and take the first step toward finding the right care. Remember, it can be used for informative purposes, no online tool is a substitute for a real doctor.

Docus AI Symptom Checker

Docus AI Symptom Checker

Just 3 simple steps to efficiently understand and manage your health symptoms online.

Causes and Risk Factors

Causes of PCOS

  • Genetic Factors: PCOS often runs in families, suggesting a genetic predisposition. Specific genes may be linked to the condition.
  • Insulin Resistance: Many women with PCOS have insulin resistance, where their bodies do not use insulin effectively. This can lead to higher insulin levels, which may increase androgen production and exacerbate symptoms.
  • Hormonal Imbalance: Elevated levels of androgens (male hormones) interfere with the normal functioning of the ovaries, affecting the menstrual cycle and ovulation.

Causes of Endometriosis

The exact cause of endometriosis is also unclear, but several theories exist that were published in NCBI:

  • Retrograde Menstruation: This theory suggests that menstrual blood flows backward through the fallopian tubes into the pelvic cavity instead of leaving the body, causing endometrial tissue to implant outside the uterus.
  • Coelomic Metaplasia: This theory proposes that cells outside the uterus transform into endometrial-like cells.
  • Embryonic Cell Transformation: Hormones such as estrogen might transform embryonic cells into endometrial-like cell implants during puberty.
  • Immune System Disorders: Problems with the immune system might make the body unable to recognize and destroy endometrial-like tissue growing outside the uterus.
  • Surgical Scars: After surgeries like a hysterectomy or C-section, endometrial cells may attach to the surgical incision.

Risk Factors for PCOS

  • Family History: Women with a mother or sister with PCOS are at higher risk.
  • Obesity: Being overweight can increase insulin levels and exacerbate symptoms.
  • Insulin Resistance: High levels of insulin can lead to higher androgen levels, affecting ovulation.

Risk Factors for Endometriosis

  • Never Giving Birth: Women who have never given birth are at higher risk.
  • Menstrual History: Starting periods at an early age, having short menstrual cycles (less than 27 days), and heavy menstrual periods that last more than seven days.
  • Family History: Having relatives with endometriosis increases risk.
  • Medical Conditions: Any condition that prevents the normal passage of menstrual flow out of the body.
  • Low Body Mass Index (BMI): Some studies suggest a link between low BMI and endometriosis.

Diagnosis Methods for PCOS and Endometriosis

Diagnostic Procedures for PCOS

  • Physical Exams: A thorough physical exam includes checking for signs of excess hair growth, acne, and other symptoms of high androgen levels. Weight and body mass index (BMI) are also measured.
  • Blood Tests: These tests measure hormone levels, including androgens, luteinizing hormone (LH), and follicle-stimulating hormone (FSH). Blood tests can also check for insulin resistance, cholesterol levels, and glucose tolerance.
  • Pelvic Ultrasound: An ultrasound uses sound waves to create an image of the ovaries and check for the presence of multiple cysts. The thickness of the uterine lining can also be assessed.
Lab Test Interpretation

Lab Test Interpretation

Upload your lab tests, receive detailed interpretations, personalized insights and recommendations.

Diagnostic Methods for Endometriosis

Endometriosis diagnosis often involves more invasive procedures to confirm the presence of endometrial tissue outside the uterus:

  • Pelvic Exams: During a pelvic exam, a doctor may feel for cysts or scars behind the uterus.
  • Imaging Tests: Ultrasound and MRI scans are used to identify larger endometrial cysts or nodules. While these tests can suggest endometriosis, they cannot definitively diagnose it.
  • Laparoscopy: This is the gold standard for diagnosing endometriosis. During this surgical procedure, a doctor inserts a laparoscope (a small camera) into the abdomen to directly visualize the endometrial tissue. Biopsies can also be taken during laparoscopy to confirm the diagnosis.

Treatment Options for PCOS and Endometriosis

Treatment Options for PCOS

  1. Lifestyle Changes: Adopting a healthy diet and regular exercise can help manage weight, improve insulin resistance, and reduce symptoms.
  2. Collaborative Care: Managing PCOS effectively often requires a team of specialists, including gynecologists, endocrinologists, dermatologists, and dietitians. This comprehensive approach ensures that all aspects of the condition are addressed.
  3. Medications:
  • Hormonal Treatments: Birth control pills can regulate menstrual cycles, reduce androgen levels, and clear acne.
  • Anti-Androgens: These medications reduce hair growth and other symptoms of high androgen levels.
  • Insulin Sensitizers: Medications can help improve insulin resistance and lower insulin levels.

Treatment Approaches for Endometriosis

According to Yale Medicine, there is currently no cure for endometriosis, so treatment focuses on managing symptoms, reducing inflammation, and preserving fertility.

1. Pain Management: Over-the-counter pain relievers and prescription medications can help manage the chronic pain associated with endometriosis.

2. Hormonal Therapies:

  • Hormonal Contraceptives: Birth control pills, patches, and vaginal rings can reduce or eliminate pain by controlling the hormones responsible for the buildup of endometrial tissue.
  • Other Hormonal Treatments: These medications reduce estrogen levels, which can shrink endometrial tissue and reduce pain.

3. Surgical Options:

  • Laparoscopy: This minimally invasive surgery is used to remove or destroy endometrial tissue outside the uterus. It can also improve fertility by clearing blockages in the fallopian tubes.
  • Hysterectomy: In severe cases, removing the uterus may be considered, especially if other treatments have failed. This option is typically reserved for women who do not wish to become pregnant in the future.

When to Seek Medical Advice

  • Severe or chronic pelvic pain
  • Irregular or absent menstrual cycles
  • Heavy menstrual bleeding
  • Pain during or after intercourse
  • Unexplained weight gain or difficulty losing weight
  • Excessive hair growth on the face or body
  • Difficulty getting pregnant

Frequently Asked Questions

Have more questions?Ask AI Doctor


Understanding the differences between PCOS and endometriosis is crucial for effective diagnosis and treatment. Both conditions can significantly impact a woman's quality of life and fertility, but with the right medical support and lifestyle changes, symptoms can be managed, and overall health can be improved. Early diagnosis and personalized treatment plans are key to managing these chronic conditions.

AI Assistant

Have Questions?

Have a question on this topic? Submit it here and get an instant answer from our AI Doctor.

Please Note!This tool is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult a professional before taking any actions.

Make Informed Health Decisions

Talk to Docus AI Doctor, generate health reports, get them validated by Top Doctors from the US and Europe.

Make Informed Health Decisions

You’re only one click away from a life-changing journey

Virtual health assistant powered by AI
350+ world-renowned Doctors