Endometriosis Explained: Symptoms, Diagnosis, and Treatment Options

TL;DR: Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus, causing chronic pain, heavy periods, and sometimes infertility. It affects roughly 190 million women worldwide, yet it takes an average of 7 to 10 years to get a diagnosis. Treatment ranges from pain management and hormonal therapy to surgery, and early intervention makes a real difference.

You've been told your period pain is normal. That every woman goes through it. That you just need to take a painkiller and push through. But deep down, you know something isn't right, because the pain you feel isn't just discomfort. It's the kind of pain that stops you mid-sentence, keeps you home from work, and makes you dread every cycle.

If this sounds familiar, you may be one of the roughly 190 million women and girls worldwide living with endometriosis (en-doh-mee-tree-OH-sis). And if you haven't been diagnosed yet, you're not alone in that either.

What Is Endometriosis?

Endometriosis is a chronic condition where tissue similar to the endometrium (the lining of your uterus, which sheds during your period) grows outside the uterus, in places it doesn't belong.

This tissue can grow on your ovaries, fallopian tubes, the outer surface of the uterus, the bowel, the bladder, and in rare cases, even more distant organs. Just like the lining inside your uterus, this tissue responds to your menstrual hormones. It thickens, breaks down, and bleeds with each cycle. But unlike a normal period, there's no way for the blood to leave your body. This leads to inflammation (swelling), scar tissue, and adhesions (bands of tissue that can cause organs to stick together).

The result? Pain. Sometimes debilitating pain.

Why Does It Take So Long to Diagnose?

Here is a statistic that should concern everyone: on average, it takes 7 to 10 years from the time symptoms begin to when a woman is finally diagnosed with endometriosis. That's not a typo. Years of suffering, doctor's visits, and being told nothing is wrong.

Several factors contribute to this delay:

• Normalization of pain, Period pain is so commonly accepted as "just part of being a woman" that severe symptoms get brushed aside, both by patients and by doctors.
• Symptom overlap, Endometriosis symptoms can mimic other conditions, including irritable bowel syndrome (IBS), PCOS, bladder infections, and more.
• No simple test, There's no blood test or routine ultrasound that can definitively diagnose endometriosis. The gold standard is surgery (more on this below).
• Limited awareness, Many healthcare providers, especially in under-resourced settings, receive minimal training on endometriosis.

What Are the Symptoms?

Endometriosis shows up differently in every woman. Some have severe symptoms with mild disease, while others have advanced disease with few noticeable symptoms. Common signs include:

• Extremely painful periods (dysmenorrhea), Pain that goes beyond typical menstrual cramps. It may start before your period and last for days. This isn't just "heavy periods", it's pain that interferes with daily life.
• Chronic pelvic pain, Ongoing pain in the lower abdomen, not just during your period. (Read more in our guide to pelvic pain.)
• Pain during or after sex (dyspareunia), Deep pain during intercourse, often described as sharp or stabbing.
• Painful urination or bowel movements, Especially during your period. Some women are misdiagnosed with IBS or urinary tract infections for years.
• Heavy or irregular periods, Bleeding that's heavier than usual or spotting between periods. (See our post on irregular periods.)
• Infertility, Endometriosis is found in 30 to 50% of women who struggle to conceive. The inflammation, scarring, and structural changes it causes can affect egg quality, block the fallopian tubes, or interfere with implantation. (Learn more in our fertility guide.)
• Fatigue, bloating, and nausea, These "invisible" symptoms are often overlooked but are very real for women with endo.

When to See a Doctor

If period pain regularly forces you to miss school, work, or social activities, that is not normal. If over-the-counter painkillers barely touch your pain, if you experience pain during sex, or if you've been trying to conceive for over a year without success, please see a doctor and specifically ask about endometriosis.

The Stages of Endometriosis

Endometriosis is classified into four stages based on the location, depth, and extent of the tissue growth:

• Stage I (Minimal), Small, shallow implants on or around the pelvic organs.
• Stage II (Mild), More implants that are deeper than Stage I.
• Stage III (Moderate), Many deep implants, small cysts on one or both ovaries (called endometriomas, or "chocolate cysts" because of the dark blood they contain), and some adhesions.
• Stage IV (Severe), Widespread deep implants, large endometriomas, and dense adhesions that may cause organs to fuse together.

An important note: the stage does not always match the level of pain. A woman with Stage I can experience excruciating pain, while a woman with Stage IV might have relatively mild symptoms. This is one reason diagnosis is so tricky.

What Causes Endometriosis?

The honest answer is that no one knows for certain. There are several theories, and the truth is likely a combination of factors:

Retrograde Menstruation

The most widely discussed theory. During your period, some menstrual blood flows backward through the fallopian tubes into the pelvic cavity instead of leaving the body. This blood contains endometrial cells, which then implant and grow. However, retrograde menstruation happens in most women, yet only some develop endometriosis, so this can't be the whole story.

Immune System Dysfunction

In healthy women, the immune system clears away any misplaced endometrial cells. In women with endometriosis, the immune system may fail to recognize and remove these cells, allowing them to implant and grow.

Genetics

Endometriosis tends to run in families. If your mother or sister has it, you are 7 to 10 times more likely to develop it. Researchers have identified several genes that may increase susceptibility.

Hormonal Factors

Estrogen plays a significant role in fueling endometriosis. The condition is driven by estrogen, which is why many treatments aim to lower estrogen levels or block its effects.

Other Theories

These include cellular transformation (where cells outside the uterus transform into endometrial-like cells), surgical scarring (endometrial cells spreading during procedures like a C-section), and lymphatic or blood vessel spread.

How Is Endometriosis Diagnosed?

Getting a diagnosis can feel like a journey in itself. Here's what the process usually involves:

Medical History and Physical Exam

Your doctor will ask detailed questions about your symptoms, the nature of your pain, your menstrual cycle, and your family history. A pelvic exam may reveal tenderness or nodules, but a normal exam does not rule out endometriosis.

Imaging

• Ultrasound, A transvaginal ultrasound (where a small probe is placed inside the vagina) can sometimes detect endometriomas (cysts on the ovaries), but it cannot reliably detect smaller implants or adhesions.
• MRI, Can provide more detailed images and help map the extent of disease before surgery, though it also has limitations.

Laparoscopy (The Gold Standard)

The only way to definitively confirm endometriosis is through a laparoscopy (lap-ah-ROS-koh-pee), a minimally invasive surgery where a thin camera is inserted through a small cut near the belly button. The surgeon can see endometrial implants directly and take tissue samples (biopsies) for confirmation. In many cases, the surgeon can also remove or destroy the tissue during the same procedure.

This reliance on surgery for diagnosis is one of the reasons the condition takes so long to identify. Many doctors, and patients, understandably hesitate before recommending or agreeing to surgery.

Treatment Options

There is currently no cure for endometriosis, but there are several effective ways to manage symptoms and slow the progression of the disease.

Pain Management

• NSAIDs, Non-steroidal anti-inflammatory drugs like ibuprofen can help with mild to moderate pain. They work best when taken before the pain becomes severe.
• Heat therapy, A heating pad or hot water bottle on the lower abdomen can provide relief.
• Pelvic floor physiotherapy, A specialized physiotherapist can help address pelvic pain caused by muscle tension related to endometriosis.

Hormonal Therapy

Since endometriosis is fueled by estrogen, hormonal treatments aim to reduce estrogen levels or counteract its effects:

• Hormonal birth control, Combined pills, the progestogen-only pill, hormonal IUDs (like the Mirena), or injections can help suppress ovulation and reduce the growth of endometrial tissue.
• GnRH agonists and antagonists, Medications like leuprolide or elagolix temporarily lower estrogen to menopausal levels, shrinking endometrial tissue. Side effects can include hot flushes and bone density loss, so they are usually prescribed for limited periods.
• Progestins, Synthetic progesterone can slow endometrial tissue growth and reduce pain.

Hormonal therapies do not eliminate endometriosis, they manage symptoms. When treatment is stopped, symptoms often return.

Surgery

• Laparoscopic excision or ablation, During a laparoscopy, a surgeon can cut out (excision) or burn away (ablation) endometrial implants and adhesions. Excision is generally considered more effective because it removes the tissue entirely rather than destroying the surface.
• Hysterectomy, Removal of the uterus, sometimes along with the ovaries (oophorectomy). This is generally reserved for severe cases where other treatments have failed and the patient does not wish to conceive. It is not a guaranteed cure, endometriosis can persist even after hysterectomy, especially if the ovaries are preserved.

Fertility Treatments

For women with endometriosis who want to become pregnant:

• Laparoscopic surgery to remove implants and adhesions can improve natural conception rates.
• IUI (intrauterine insemination), Sperm is placed directly into the uterus around the time of ovulation.
• IVF (in vitro fertilization), Eggs are retrieved, fertilized in a lab, and the resulting embryo is transferred to the uterus. IVF bypasses many of the obstacles endometriosis creates and is often recommended for moderate to severe cases.

Early referral to a fertility specialist is important if you have endometriosis and are planning a pregnancy.

Living with Endometriosis

Endometriosis is a chronic condition, and managing it is often a long-term commitment. Here are some things that can help:

• Find a knowledgeable doctor, Not all gynaecologists are experienced with endometriosis. Look for specialists or centres that focus on the condition. If your concerns are being dismissed, seek a second opinion.
• Track your symptoms, Use a journal or an app to record your pain, energy levels, bowel habits, and cycle. This data is incredibly valuable during medical appointments.
• Build a support system, Living with chronic pain can be isolating. Support groups, both online and in person, connect you with women who understand what you're going through.
• Prioritize mental health, Chronic pain conditions are strongly linked to anxiety and depression. Therapy, mindfulness practices, and simply acknowledging the emotional burden of endo are all worthwhile.
• Communicate with your partner, If pain during sex is an issue, open communication and exploring different approaches to intimacy can help. A pelvic floor physiotherapist can also provide guidance.

Getting Diagnosed in Africa: The Extra Challenge

In many parts of Africa, the diagnostic delay for endometriosis is likely even longer than the global average, though reliable data is scarce because research on endometriosis in African populations remains limited.

Several factors make diagnosis harder:

• Cultural normalization of period pain, In many communities across Nigeria, Kenya, Ghana, South Africa, and beyond, girls are taught from a young age that painful periods are simply part of womanhood. Severe pain is met with advice to "bear it" or "it will get better after you have children."
• Limited access to specialist care, Gynaecologists with endometriosis expertise are concentrated in major cities. Rural and semi-urban communities often lack the diagnostic tools (MRI, laparoscopy) needed to identify the condition.
• Cost of diagnosis and treatment, Laparoscopy and hormonal treatments can be expensive, and many health insurance schemes in African countries do not adequately cover them.
• Stigma around reproductive health, Open conversations about periods, pelvic pain, and pain during sex remain taboo in many settings, preventing women from seeking help early.
• Misdiagnosis, Women with endometriosis symptoms are frequently diagnosed with pelvic inflammatory disease (PID), fibroids, or simply "painful periods" without further investigation.

If you are in Africa and suspect you have endometriosis, know this: your pain is valid, and you deserve a thorough evaluation. Seek out a gynaecologist, bring your symptom records, and don't be afraid to push for answers. Advocacy, for yourself and for better healthcare systems, is part of the path forward.

The Bottom Line

Endometriosis is not rare. It is not "just bad periods." It is a real, complex medical condition that affects every aspect of a woman's life, her physical health, her mental well-being, her relationships, and her fertility.

The 7-to-10-year diagnostic delay is not acceptable, and it won't change until we all, patients, doctors, policymakers, and communities, take period pain seriously. If something feels wrong, trust your body. Seek help. And know that you are not alone.

References

1. World Health Organization. "Endometriosis." who.int
2. Zondervan, K.T., Becker, C.M., & Missmer, S.A. "Endometriosis." New England Journal of Medicine, 382(13), 2020. nejm.org
3. Endometriosis Foundation of America. "What Is Endometriosis?" endofound.org
4. Nnoaham, K.E., et al. "Impact of endometriosis on quality of life and work productivity: a multicenter study across ten countries." Fertility and Sterility, 96(2), 2011. fertstert.org
5. Agarwal, S.K., et al. "Clinical Diagnosis of Endometriosis: A Call to Action." American Journal of Obstetrics and Gynecology, 220(4), 2019. ajog.org
6. Kyama, C.M., et al. "Endometriosis in African Women." Women's Health, 3(5), 2007. journals.sagepub.com

Related posts on Asele:

• PCOS Explained: Symptoms, Causes, and What You Can Do About It
• Fertility 101: Tips and Facts About Getting Pregnant
• Heavy Periods: What's Normal, What's Not, and What to Do
• Why Is My Period Irregular? Causes, Concerns, and When to See a Doctor
• Pelvic Pain: Causes, Types, and When to See a Doctor