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Endometriosis

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Evidence-based guides on recognizing, diagnosing, and treating endometriosis throughout life—including deep infiltrating, bowel, bladder, diaphragm disease, and endometriomas—plus fertility, cancer signs, pain, and work and disability.

Overview

Endometriosis is a chronic inflammatory condition in which tissue similar to the uterine lining grows outside the uterus, most often on the ovaries, peritoneum, bowel, bladder, diaphragm, and nerves. It can cause severe period and pelvic pain, pain with sex, bowel or urinary symptoms, fatigue, and sometimes infertility—yet some people have few signs. Symptoms can begin in adolescence, fluctuate with hormones, and persist after pregnancy or menopause, affecting school, work, and daily life.


Guides here focus on recognizing patterns of disease, the path to diagnosis, and options to control symptoms and protect fertility over time. Learn when to use clinical evaluation and Diagnostics & Imaging such as Ultrasound and MRI, when laparoscopy is considered, and how results shape care. Explore approaches ranging from hormone and pain therapies to organ‑sparing Surgery and Excision Surgery, complemented by whole‑person support within Integrative & Holistic Medicine. For organ‑specific information see Bowel Endometriosis, Bladder Endometriosis, Diaphragmatic Endometriosis, and Endometriomas. Distinguish endometriosis from coexisting Adenomyosis and understand implications for Fertility & Reproductive Health and Menopause & Hormonal Transitions.

Common Questions

How rare is endosalpingiosis?

Endosalpingiosis is generally considered uncommon, but “how rare” it is depends heavily on who’s being studied and how it’s found. Many cases are discovered incidentally on pathology—meaning tissue is identified under the microscope after surgery done for other reasons—so it’s likely underrecognized in the general population. In other settings (like surgical cohorts), it may appear more often simply because more tissue is being sampled and examined carefully.


What matters most for patients is that endosalpingiosis can be confused with endometriosis on imaging or even at surgery, yet it doesn’t always behave the same way clinically. If you’ve been told you have endosalpingiosis and you also have pelvic pain, bowel/bladder symptoms, or fertility concerns, our team can help interpret what that finding means in the context of your symptoms and operative/pathology reports. You’re welcome to explore our educational content on related endometriosis and uterine conditions, and reach out to schedule a consultation if you want a personalized plan.

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How does estrogen affect the endometrium?

Estrogen is one of the main hormones that drives endometrial growth. In the first half of the menstrual cycle, rising estrogen signals the endometrium to thicken and rebuild after a period, preparing the uterus for a possible pregnancy. It also influences the local immune and inflammatory environment in the uterus, which is part of why hormonal shifts can change bleeding patterns and pain.


When estrogen’s growth signals are strong—and progesterone’s “calming” effect is weaker than expected (often described as progesterone resistance)—the endometrium can behave in a more persistently inflamed, reactive way. This hormone–inflammation pattern is especially relevant in estrogen-dependent conditions like adenomyosis and endometriosis, where tissue similar to the endometrium can contribute to ongoing symptoms. If you’re trying to make sense of heavy bleeding, severe cramping, or cycle-linked pelvic pain, our team can help you connect the hormonal biology to what you’re feeling and review next steps for diagnosis and treatment.

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What does a frozen uterus mean with endometriosis?

A “frozen uterus” isn’t a separate diagnosis—it’s a descriptive term surgeons use when the uterus is essentially stuck in place because endometriosis-related inflammation has caused dense scarring (adhesions). Instead of the uterus moving freely, it may be tethered to nearby structures like the bowel, bladder, ovaries, or pelvic sidewall, sometimes pulling the uterus into an abnormal position and making pelvic anatomy hard to distinguish.


This finding often suggests more advanced disease, such as deep infiltrating endometriosis and/or significant adhesions from prior inflammation or surgery, and it can help explain symptoms like deep pelvic pain, painful sex, bowel or bladder symptoms, or pain that doesn’t match what a routine exam shows. In these cases, surgery is less about “burning spots” and more about carefully restoring normal anatomy—freeing organs, protecting ureters and bowel, and removing endometriosis at its roots. If you’ve been told your uterus is “frozen,” our team can help you understand what that implies for imaging, surgical planning, and which adjacent organs may need to be evaluated as part of a complete excision strategy.

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What are peritoneal pockets in endometriosis?

Peritoneal pockets are small “indentations” or fold-like defects in the peritoneum—the thin lining that covers the pelvic organs and inner abdominal wall. In endometriosis surgery, we may see these pockets as tucked-in areas or little pits in the peritoneal surface, and they can be associated with superficial peritoneal endometriosis or early/developing disease patterns.


These pockets matter because endometriosis doesn’t always look like obvious black or red implants; it can hide within subtle anatomic changes, scarring, or altered peritoneal contours. In the operating room, careful inspection and technique are important so that disease within or around a peritoneal pocket isn’t missed or only treated on the surface. If you’ve been told you have “peritoneal pockets,” our team can help you understand what that finding may mean in your case—based on your symptoms, imaging, and whether deeper structures (like bowel, bladder, or ureters) could also be involved.

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How long does endo belly (bloating) usually last?

“Endo belly” can last anywhere from a few hours to several days, and for some people it can linger longer or feel nearly constant during certain parts of the month. The duration often depends on what’s driving it for you—hormone-linked inflammation around ovulation or a period, bowel slowing/constipation, pelvic adhesions restricting organ movement, or a combination. Many patients notice it waxes and wanes, sometimes changing noticeably within the same day.


If your bloating is predictable and cyclical, that pattern can be a clue that endometriosis or adenomyosis-related inflammation is playing a major role—even when imaging looks “normal.” If it’s frequent, severe, or paired with bowel or bladder symptoms (pain with bowel movements, urinary urgency, rectal pressure), it can also suggest deeper pelvic disease or significant inflammation affecting nearby organs. Our team can help you sort out whether your “endo belly” is primarily hormonal, GI-driven, or related to pelvic disease that may benefit from targeted treatment, including excision when appropriate—reach out to schedule a consultation and we’ll map your symptoms to a clear plan.

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What causes estrogen dominance with endometriosis?

“Estrogen dominance” in endometriosis usually isn’t just about making too much estrogen overall—it’s more often about an estrogen-favoring environment in the pelvis and within the lesions themselves. Many endometriosis lesions can produce estrogen locally (for example, through higher aromatase activity), and that local estrogen can help lesions survive, inflame surrounding tissue, and stimulate nerve growth that drives pain. At the same time, endometriosis commonly behaves as a chronic inflammatory condition, and inflammation can reinforce estrogen signaling and keep the cycle going.


Another key piece is that endometriosis often shows a weaker response to progesterone (“progesterone resistance”), so the normal hormonal braking system that should counterbalance estrogen doesn’t work as well. This can make symptoms feel very hormone-driven even when blood hormone labs look “normal.” Because endometriosis is multifactorial and likely includes different subtypes, the specific drivers of estrogen dominance can vary from person to person—genetics/epigenetics, immune dysfunction, and tissue-level changes can all play a role. If you’re trying to make sense of your symptoms or why hormonal suppression hasn’t brought lasting relief, our team can help you sort out what may be driving your disease and discuss options that focus on treating the endometriosis itself, not just temporarily quieting it.

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How fast does endometriosis grow?

Endometriosis doesn’t grow at one predictable “rate.” It’s a heterogeneous condition—meaning different subtypes and lesion types can behave very differently—so one person may have slow, relatively stable disease while another has more biologically aggressive, invasive lesions that progress faster. Growth is influenced by where it is (surface vs deeper tissues or organs), the local inflammatory environment, and hormone signaling (including local estrogen activity and reduced progesterone response).


What most people notice first isn’t literal growth you can feel happening day-to-day, but changing symptoms over months or years—new bowel or bladder symptoms, worsening pain, or the appearance/enlargement of an endometrioma on imaging. It’s also why “stage” doesn’t reliably predict pain, and why a normal exam (or even normal imaging) doesn’t rule out active disease, especially with deep infiltrating endometriosis. If you’re trying to understand whether your symptoms suggest progression, our team can help you connect your symptom pattern with the most likely disease types and next diagnostic steps, and discuss when strategic excision surgery is appropriate.

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Is a retroverted uterus linked to endometriosis?

A retroverted uterus (a uterus that tilts backward) is usually a normal anatomical variation, and by itself it doesn’t diagnose endometriosis. That said, endometriosis can be associated with a “fixed” or less-mobile retroverted uterus when inflammation, adhesions, or deep disease tether the uterus backward and limit how it moves on exam.


If your imaging report mentions a retroverted uterus and you also have symptoms like painful periods, deep pain with sex, bowel/bladder pain (often cyclical), or chronic pelvic pain, we look at the whole picture—not just the uterine position—to assess whether endometriosis and/or adenomyosis could be contributing. Our team can help interpret your ultrasound/MRI findings in context and, when appropriate, discuss whether minimally invasive excision surgery is the best next step for both diagnosis and lasting relief.

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Reach Out

Have a question?

Dr. Steven Vasilev delivers best-in-class endometriosis guidance and a personalized treatment plan—built on evidence and your unique biology.


Led by Steven Vasilev, MD—an internationally recognized endometriosis specialist & MIGS surgeon—Lotus Endometriosis Institute is virtual-forward, with many patients traveling nationally for care. Clinical evaluation and surgical treatment are provided in California.

Santa Monica, CA

2121 Santa Monica Blvd, Santa Monica, CA 90404

Operating Hours

8:00 am - 5:00 pm
Monday - Friday

Arroyo Grande, CA

154 Traffic Way, Arroyo Grande, CA 93420