Pelvic Venous Disease: When Pelvic Pain Gets Worse by Evening

TL;DR: Some chronic pelvic pain comes from veins in the pelvis that have stretched out and stopped moving blood the way they should. The clue is timing: this pain is a heavy, dragging ache that gets worse the longer you stand or sit, is at its worst by evening, and eases once you lie down. That is different from endometriosis pain, which usually tracks with your period, and you can have both at the same time. A normal pelvic ultrasound does not rule this out, because the veins empty out when you lie flat for the scan. If the pattern fits, the tests that answer it are a transvaginal ultrasound with Doppler done sitting up or while bearing down, or a scan of the veins called MR or CT venography. Write down when the pain starts and what makes it better, and bring that to your visit. The procedure that treats the veins is done by a specialist called an interventional radiologist. Your primary care doctor's job is to spot the pattern, rule out the other causes, and get you in front of the right person.

By the time this question comes up, you have usually had the ultrasound, the urine cultures, the stool tests, and sometimes a laparoscopy, and been told that everything looks normal. The pain has not gone anywhere. It is worse by evening, worse after a long shift or a long sit on I-95, and it eases once you lie down, and that last detail is usually the one nobody has asked about.

Pelvic venous disease is a recognized and treatable cause of chronic pelvic pain, and it is one that primary care rarely thinks of, because the pattern that identifies it lives in the history rather than on the standard scan. What I want you to know is that the timing of your pain carries more diagnostic weight than the report from a scan taken while you were lying still.

What does pelvic venous pain feel like, and when does it hurt?

Pelvic venous pain has a shape you can describe in a sentence, and the shape is the diagnostic clue.

The pain is usually a dull ache rather than a sharp stab, and women describe it as heaviness, fullness, or a dragging sensation low in the pelvis, often on the left. It builds with prolonged standing, prolonged sitting, walking, and anything that raises pressure inside the abdomen, and it gets heavier as the day goes on. Lying down relieves it, often within 20 to 30 minutes, which is why so many women describe the evening as the hardest part of the day and the morning as the easiest. The MSD Manual's professional summary of pelvic venous disorders describes this same rhythm: pain worse at the end of the day after sitting or standing a long time, relieved by lying down.

Several other symptoms travel with it. Deep pain during sex is common, and so is a prolonged dull ache for hours or into the next day afterward, which is a more specific clue than pain during sex alone. Periods are often heavier and more painful. Urinary urgency and frequency show up in some women. And there are visible signs on the outside worth checking for: varicose veins on the vulva, the perineum, the buttock, or the back of the thigh, and leg varicose veins in an unusual distribution or ones that came back quickly after being treated. Those extrapelvic varicose veins arise when pelvic vein reflux escapes through connections in the pelvic floor, and one review of the anatomy reports them in roughly 16.5% of women, rising to about 25.6% among women with recurrent varicose veins.

You may also read that enlarged pelvic veins press on nearby nerves and send pain radiating into the groin or down the thigh. That has been described, and the published evidence for it is a small number of case reports rather than any series, so radiating leg or groin pain deserves its own evaluation rather than being filed under the veins.

Who gets this follows the same physiology. It is described mainly in premenopausal women, and having been pregnant is the most consistently reported risk factor, since pelvic vein capacity expands considerably during pregnancy while estrogen and progesterone both relax vein walls and valves. Read that association with a caveat: the original 1984 description defined the condition in multiparous premenopausal women, so parity has been partly built into the definition ever since. What the imaging work adds is that parity does drive the anatomy, with dilated incompetent ovarian veins found in 63% of asymptomatic women who had given birth against 10% of those who had not. Symptoms are generally described as easing after menopause as estrogen falls, and postmenopausal cases do occur.

None of these features is unique on its own. Taken together, and anchored on the gravity-dependent timing, they describe a picture that is different from the other common causes of chronic pelvic pain, and different enough to change what gets ordered.

Why is it called pelvic venous disorder now instead of pelvic congestion syndrome?

Because the older name described a picture without describing the plumbing, and the plumbing decides the treatment.

In 2021 an international working group convened by the American Vein and Lymphatic Society published the Symptoms-Varices-Pathophysiology classification, usually shortened to SVP. It sorts a patient along 3 domains: the symptoms she has, where the varicose veins are, and the underlying pathophysiology, which is further broken into the anatomy involved, the hemodynamics (reflux versus obstruction), and the cause. The group stated plainly that the historical labels, meaning pelvic congestion syndrome, May-Thurner syndrome, and nutcracker syndrome, are misleading, because they treat as separate diseases what are often overlapping expressions of the same venous problem, and because they hide the distinction between a vein that leaks backward and a vein that is being squeezed shut.

The term now used across the consensus literature is pelvic venous disorders, sometimes abbreviated PeVD. Pelvic congestion syndrome has not disappeared from clinical conversation, and you will still see it on referral letters, in insurance policies, and in most of what a search returns, so keep using whichever phrase gets you understood. When you read the newer literature, the 2 phrases refer to the same territory.

The practical value of the newer framing is that it forces a question the older label allowed everyone to skip: is the problem reflux, obstruction, or both. Reflux is treated by closing the leaking vein, obstruction is treated by opening the squeezed one, and doing the first when the answer was the second can make a woman worse.

Why is the left side almost always the problem?

The left side dominates because the left ovarian vein has a harder job than the right one, and the anatomy is not symmetric.

The right ovarian vein drains directly into the inferior vena cava, the large vein returning blood to the heart, usually entering it at a sharp angle just below the right renal vein. The left ovarian vein does something different: it drains upward into the left renal vein, which then crosses the midline to reach the vena cava. That makes the left-sided route longer and gives it an extra junction to negotiate against gravity when you are upright.

The valves differ too. A meta-analysis of ovarian vein anatomy pooling 35 studies found that ovarian vein valves are competent in only about 72% of veins overall, with incompetence far more common on the left. A valve that does not close lets blood fall backward down the vein when you stand, and the pooled blood distends the network of veins around the ovary and uterus.

Two compression syndromes drive the same left-sided pattern, and both matter because they change what treatment is appropriate:

• Nutcracker anatomy is compression of the left renal vein where it passes between the aorta and the superior mesenteric artery. Blood that cannot get out through the squeezed segment finds another way, and one of the available routes is backward down the left ovarian vein into the pelvis. Flank pain, blood in the urine, and protein in the urine can accompany it, though many women have none of that.
• May-Thurner anatomy is compression of the left common iliac vein where the right common iliac artery crosses over it and presses it against the spine. The classic consequence is left leg swelling or a left leg clot, and pelvic symptoms can come from the same obstruction. Our guide to swollen feet and ankles covers the leg side of that picture, including when one-sided swelling needs same-day attention and how compression is chosen.

The distinction that matters is between a vein leaking backward on its own, which is called primary reflux, and a vein leaking backward because something upstream is obstructed, which is secondary. They look similar on a symptom list and call for different procedures.

How is this different from endometriosis, and can you have both?

The timing separates them, and the honest answer to the second question is yes, often.

Endometriosis pain is classically cyclical. It tracks with the menstrual cycle, peaks around periods, and frequently includes pain with bowel movements or urination during a period. Pelvic venous pain is classically postural. It tracks with gravity and time upright rather than with the calendar, builds through the day, and eases when lying flat. Both cause deep pain with sex, both cause painful periods, and both are worse in the second half of the cycle for some women, so the overlap is genuine. When women describe a pain that is present most days, heaviest in the evening, and improved by lying down, that is the venous pattern speaking, even when endometriosis is also on the chart.

Treating this as an either/or is how people end up half-treated. A woman can have laparoscopically confirmed endometriosis, be treated well for it, and still be left with a dragging evening ache that nobody has explained, because the second problem was never on the list. Observational work has reported ovarian varices more often in women with endometriosis than in women without, and the gynecologic reviews of pelvic congestion recommend that the 2 be considered together rather than as competing explanations. Our companion guide, Endometriosis: What a Normal Scan Cannot Tell You, covers why a normal pelvic ultrasound or MRI does not exclude endometriosis either, which is a parallel problem with a different mechanism.

The same principle applies to the other neighbors. Interstitial cystitis and bladder pain syndrome, irritable bowel syndrome, pelvic floor myofascial pain, and hip and abdominal wall problems all sit in the same neighborhood and all coexist with each other more often than a tidy diagnosis would suggest.

Why does a normal pelvic ultrasound not rule this out?

Because a standard pelvic ultrasound is done with you lying flat, and lying flat is the position in which these veins empty.

A normal supine pelvic ultrasound does not rule out pelvic venous disease. The veins that hurt are distended by gravity when you are upright and decompress when you are horizontal, so a scan performed lying down can show a normal-caliber vein in a woman whose veins are visibly dilated when she stands. The same limitation applies to a supine MRI or CT. The diagnostic literature names this directly, and the NIHR systematic review of imaging accuracy flags supine positioning as a reason non-invasive imaging misjudges pelvic vein incompetence.

The workup that does answer it runs from the bedside to the catheter lab.

Transvaginal ultrasound with Doppler, done dynamically. This is the practical first-line test. Doppler adds flow direction and duration, so the study can show blood falling backward rather than only measuring how wide a vein is. To be adequate it needs to be done both lying and either semi-upright or standing, with a Valsalva maneuver, which is bearing down as if straining. A 2025 systematic review and meta-analysis of 7 studies covering 802 patients found pooled sensitivity of 96% and specificity of 84% for ultrasound against catheter venography, with transvaginal scanning performing at 96% and 86%. That is good enough to be the screening test, and it depends heavily on the operator knowing what to look for and how to position you.

The thresholds, and what they are worth. Commonly used criteria include an ovarian vein diameter above 6 mm, dilated periovarian and parauterine veins above 4 to 5 mm, slow or reversed flow, and reflux on Valsalva. Diameter alone is a weak criterion. In the same meta-analysis, a larger diameter cutoff bought specificity at the cost of sensitivity: studies using a threshold above 7 mm pooled at 94% sensitivity and 96% specificity, while studies using a smaller threshold reached 99% sensitivity but only 75% specificity. Reflux carries more weight than caliber.

MR or CT venography. These map the anatomy the ultrasound cannot see well, including the renal vein, the iliac veins, and any compression. MR venography is the usual choice when nutcracker or May-Thurner anatomy is a question, because it images the crossings without radiation. Read with the same caution about position: a supine study underestimates distension.

Catheter venography remains the reference standard. A catheter is threaded into the pelvic veins and contrast is injected, giving direct pressure and flow information. It is invasive, it belongs in specialist hands, and it is usually done at the same sitting as treatment rather than as a standalone diagnostic step.

How strong is the evidence that pelvic veins cause pain?

Strong enough to take seriously, and not strong enough to accept an imaging finding as a verdict.

Two facts have to sit side by side. The first is that pelvic vein incompetence is much more common in women with chronic pelvic pain than in women without it. A case-control study of 328 premenopausal women found pelvic vein incompetence in 62% of women with chronic pelvic pain against 19% of matched controls, an odds ratio of 6.79. Pelvic varices themselves were found in 27% of the women with pain and 2% of the controls, an odds ratio of 18.9. Those are large differences.

The second fact is that dilated pelvic veins also turn up in women who feel nothing. A CT study of asymptomatic women found incompetent and dilated ovarian veins in 63% of asymptomatic women who had given birth and in 10% of those who had not, and its authors concluded that as an isolated finding it is unlikely to represent pelvic congestion syndrome. The 2016 NIHR health technology assessment reviewed the whole field and concluded that the causal relationship between pelvic vein incompetence and chronic pelvic pain is not established, and that there were no consistent diagnostic criteria across the studies it examined.

Both things being true has a practical consequence. The diagnosis is made from symptoms that fit plus imaging that fits, in a woman whose other causes have been considered. A scan report saying "dilated left ovarian vein" in someone without the postural pattern is a finding rather than an answer.

You may see it written that pelvic congestion accounts for up to a third of chronic pelvic pain. I have not been able to trace that figure to a primary study, and it circulates mainly through review articles and clinic pages that cite each other. What the primary literature supports is the association above, plus the older observation that a large share of women who undergo laparoscopy for chronic pelvic pain have no visible pathology at all, and that is the group in whom a venous cause deserves a thought.

What is the connection between pelvic venous disease and POTS?

Two things sit close together here that were not connected in the literature until recently. Women with postural orthostatic tachycardia syndrome get worse standing up, and so do women with pelvic venous disease. The proposed mechanism is the same in both directions: blood pools in the pelvic and leg veins when a compressed vein blocks the way out, less blood returns to the heart, and the heart rate climbs to compensate for what it is not receiving.

A pair of retrospective studies published in early 2026 put numbers on it. In the first, 129 patients carrying a POTS or orthostatic intolerance diagnosis who also had symptoms suggesting a pelvic venous problem were imaged, and 107 of them, 83%, had confirmed compression of the iliac vein, the renal vein, or both, or pelvic venous congestion. That figure describes a group already selected for pelvic symptoms, so it is not the rate of pelvic venous disease in POTS generally.

The finding in that study with the widest reach is about the scans. Measured against catheter venography with intravascular ultrasound, screening ultrasound picked up iliac vein compression 53% of the time, CT 50%, and MR 72%. A normal screening scan in this group missed the diagnosis roughly half the time, which is the same lesson the postural history teaches, arriving from a different direction.

The second study followed 271 women with POTS or orthostatic intolerance who had a compressed left common iliac vein opened with a stent, averaging 78% narrowing before treatment. Their orthostatic symptom scores fell from 6.24 before the procedure to 4.07 at 3 months and 3.67 at a year, around 70% met the threshold for a clinical response, and roughly 8 in 10 reported feeling better overall. Pelvic pain and urinary scores improved alongside. There were no major complications and a 5.5% rate of minor ones.

Read that second study for what its design can carry. It was retrospective with no comparison group, so improvement over a year cannot be separated from the natural course of the condition or from the effect of having had a procedure, the outcomes are questionnaires filled in by women who knew they had been treated, and the data come from the practice that performs the stenting. What it establishes is that the question deserves a proper trial, which is what its authors say as well.

What this means for you is narrower than the headline. If you carry a POTS or dysautonomia diagnosis and you also have the postural pelvic ache, pelvic heaviness, left leg swelling, or vulvar or thigh varicose veins, the venous question is worth putting on the table, and a normal screening scan is not the end of it.

What does primary care do while a referral is pending?

Three things, and each of them is useful whether or not the veins turn out to be the answer.

Rule out the mimics properly. Chronic pelvic pain has a long differential and most of it belongs in primary care. That means a pregnancy test where relevant, testing for sexually transmitted infection, urinalysis and culture, an assessment for endometriosis and adenomyosis, an examination of the pelvic floor for muscle tension and trigger points, consideration of irritable bowel syndrome and constipation, an abdominal wall and hernia examination, a look at the hip and sacroiliac joints, and a review of what a previous laparoscopy did and did not find. A pelvic ultrasound still belongs in the workup for masses, fibroids, and ovarian pathology, and knowing why it was ordered keeps a normal result from being read as an all-clear for the veins.

Treat what travels with it. Heavy periods deplete iron long before they cause anemia, and iron deficiency with heavy periods is worth checking with a ferritin rather than a hemoglobin alone. Pelvic floor physical therapy with a therapist trained in manual internal work helps the muscle component that almost always accompanies a long-standing pelvic pain problem. Constipation raises intra-abdominal pressure and makes venous symptoms worse. Sleep and mood deserve attention on their own terms, because years of unexplained pain take a toll that is separate from the mechanism. Graduated compression garments help some women with vulvar or leg varicosities, and for anyone with leg symptoms the compression discussion in our swollen feet and ankles guide applies here too, including the arterial check that comes before firm compression.

Set expectations plainly. Hormonal suppression has been studied. The best-known randomized trial, Soysal and colleagues in 2001, compared goserelin with medroxyprogesterone acetate over 6 months in 47 women and found goserelin superior on both symptom and venographic measures at 1 year. That is a small trial from 25 years ago, and it is close to the whole of the randomized medical-therapy evidence, so it is reasonable to try and unreasonable to promise. Medical therapy suppresses; it does not fix the vein.

At Fishtown Medicine the workup for this happens over messages and scheduled visits rather than in 12-minute slots, which matters for a condition whose diagnosis is built out of a careful history. Labs and imaging run through your insurance in the usual way; the visits themselves are covered by membership or a package. If you have been through several rounds of testing already, the most useful next step is to tell Dr. Ash what the pattern looks like, including what has already been ruled out.

What does treatment look like once you reach a specialist?

The main interventional option is ovarian vein embolization. An interventional radiologist performs it in a hospital or procedure suite, and Fishtown Medicine refers for it rather than performing it.

The procedure is done through a small puncture in a vein at the neck, arm, or groin, under local anesthetic and sedation, usually as a day case. A catheter is guided into the incompetent ovarian vein, venography confirms the reflux, and the vein is then closed off from the inside using coils, a sclerosing foam, or a liquid embolic agent, sometimes in combination. Blood that was falling backward down that vein is redirected into the normal drainage routes. Internal iliac vein branches are treated in the same session when they are part of the problem. Where the underlying issue is obstruction rather than reflux, the plan changes: a compressed iliac or renal vein may need stenting, and that decision belongs to a vascular specialist who has seen the venography.

The results reported across the published literature are good. A 2024 systematic review of 25 studies covering 2,038 women found that 18 of the 25 reported pain scores before and after embolization, and nearly all showed a statistically significant reduction, with meaningful improvement reported in dyspareunia and urinary symptoms. Serious complications were uncommon; coil migration is the most discussed one and is generally reported in the low single digits by percentage and usually retrievable.

The caveats belong in the same breath. Most of that literature is uncontrolled: retrospective and prospective case series in which every woman received the treatment, so improvement over time cannot be separated from the natural course of the condition or from the effect of undergoing a procedure. Recurrent or persistent pain after coil embolization is described at 1 to 2 years in some series. Randomized evidence is thin and recent. A 2023 randomized trial of 60 women compared venography plus transvenous occlusion against venography alone and reported lower pain scores in the treated group at 12 months, and a single-blinded randomized trial comparing embolization with venography alone, the EMBOLIZE trial, was published in 2026. The field is building the controlled evidence it spent 3 decades without.

The order of operations matters here, and getting it wrong causes harm. When the left renal vein is compressed and the ovarian vein has become an escape route for blood that cannot get out any other way, closing that ovarian vein removes an outflow channel and can raise pressure back in the kidney, producing new or recurrent symptoms. That is why the obstruction question has to be answered before the reflux is treated, and why a workup that stops at "dilated ovarian vein" is incomplete.

When does pelvic pain need to be seen sooner?

Most chronic pelvic pain can be worked up over weeks. A short list moves it up the queue.

Go to an emergency department for sudden severe pelvic pain, particularly with fainting, a racing heart, or a positive pregnancy test, since ovarian torsion, a ruptured cyst, and ectopic pregnancy present that way. The same applies to pelvic or abdominal pain with fever and feeling systemically unwell.

Arrange same-day evaluation for new swelling of 1 leg with pain, warmth, or redness, which needs a deep vein clot ruled out, and for pelvic pain with heavy vaginal bleeding that is soaking through protection hourly.

Reach out within the week for blood in the urine, new pain after a procedure, unexplained weight loss, a change in bowel or bladder habit that is new and persistent, or pelvic pain that has become severe enough to keep you from working or sleeping.

Guidance from the Clinic

"The question that changes the direction of these visits is when the pain is at its worst and what position makes it better. If someone tells me it builds through the day, that standing at work or sitting through a long meeting makes it heavier, and that lying down takes the edge off within half an hour, I am thinking about veins before I am thinking about anything else. That history costs nothing and takes 2 minutes, and it is the reason a scan gets ordered the right way instead of being repeated lying flat for a third time. I do not do the procedure that treats this. What I can do is recognize the pattern, work through what else it could be, and put you in front of the person who does."

Related at Fishtown Medicine

• Endometriosis: What a Normal Scan Cannot Tell You - the other cause of chronic pelvic pain that normal imaging fails to exclude
• Swollen Feet and Ankles - venous insufficiency, May-Thurner anatomy, and how compression is chosen
• Bladder Pain When Every Urine Culture Comes Back Negative - the bladder condition that shares this neighborhood and this delay
• Iron, Heavy Periods, and Hair Loss - checking ferritin when periods are heavy, long before anemia appears
• Bloated After Every Meal? Here's Why. - the gut causes that sit in the same differential
• Lost Your Drive? Its Fixable. - where pelvic pain and sexual health intersect
• Lipedema: When Diet and Exercise Never Touch Your Legs - another condition women are told to try harder about
• The Patient Who Connected Her Own Dots: POTS, MCAS, and Hypermobility - when several overlapping diagnoses turn out to be one pattern

Scientific References

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2. Champaneria R, Shah L, Moss J, et al. "The relationship between pelvic vein incompetence and chronic pelvic pain in women: systematic reviews of diagnosis and treatment effectiveness." Health Technology Assessment. 2016;20(5). NIHR Journals Library | NCBI Bookshelf
3. Hansrani V, Dhorat Z, Ubhi J, et al. "Pelvic vein incompetence and chronic pelvic pain: a case-control study." BJOG: An International Journal of Obstetrics and Gynaecology. 2023. Wiley | PMC
4. Rozenblit AM, Ricci ZJ, Tuvia J, Amis ES Jr. "Incompetent and dilated ovarian veins: a common CT finding in asymptomatic parous women." American Journal of Roentgenology. 2001;176(1):119-122. AJR
5. Pitoulias AG, Andrioti Petropoulou N, Bontinis V, et al. "Ultrasonography in the diagnosis of pelvic vein insufficiency, a systematic review and meta-analysis." Phlebology. 2025. SAGE
6. Hanna L, et al. "Efficacy of embolotherapy for the treatment of pelvic congestion syndrome: A systematic review." Irish Journal of Medical Science. 2024;193:1441-1451. Springer | PMC
7. Hansrani V, Abbas A, Bhandari S, et al. "Transvenous occlusion of incompetent pelvic veins to treat chronic pelvic pain in women: A randomised controlled trial." BJOG: An International Journal of Obstetrics and Gynaecology. 2023. Wiley | PubMed
8. Winokur RS, Martinez-Salazar GM, et al. "Randomized Controlled, Single-Blinded, Parallel-Group Trial of Ovarian Vein and Pelvic Vein Embolization in Women with Chronic Pelvic Pain and Pelvic Varices (EMBOLIZE Trial)." Journal of Vascular and Interventional Radiology. 2026. PubMed
9. Knuttinen MG, Khilnani NM, et al. "Diagnosis and Management of Pelvic Venous Disorders: AJR Expert Panel Narrative Review." American Journal of Roentgenology. 2023;221(5):565-574. AJR | PubMed
10. Kot A, et al. "Anatomical variations of the ovarian veins and their clinical implications: a meta-analysis." Folia Morphologica. Folia Morphologica
11. Soysal ME, Soysal S, Vicdan K, Ozer S. "A randomized controlled trial of goserelin and medroxyprogesterone acetate in the treatment of pelvic congestion." Human Reproduction. 2001;16(5):931-939. Oxford Academic
12. Kurstjens RLM, et al. "Management of Extra-Pelvic Varicose Veins of Pelvic Origin in Female Patients." Journal of Clinical Medicine. 2025;14(8):2707. PMC
13. "Pelvic Congestion Syndrome: The Gynecological Perspective." Journal of Clinical Medicine. 2026;15(4):1655. MDPI
14. "Pelvic Venous Disorders." MSD Manual Professional Edition. MSD Manual
15. "Pelvic Congestion Syndrome." StatPearls. StatPearls Publishing. NCBI Bookshelf
16. Beard RW, Highman JH, Pearce S, Reginald PW. "Diagnosis of pelvic varicosities in women with chronic pelvic pain." The Lancet. 1984;2(8409):946-949. (The original description, which defined the condition in multiparous premenopausal women.)
17. Spencer EB, Elhage Hassan M, Saikia J, et al. "Association and post-iliac vein stenting symptom improvement of postural orthostatic tachycardia syndrome and orthostatic intolerance with pelvic venous disorders: two retrospective studies." eClinicalMedicine. 2026;92:103772. PubMed (Both studies are retrospective and the treatment cohort has no comparison group.)