Pelvic Congestion Syndrome (PCS):
A Hidden Cause of Chronic Pelvic Pain

What’s PCS? 🩸

Pelvic Congestion Syndrome (PCS) is an often overlooked cause of chronic pelvic pain.

In simple terms, it's like varicose veins, but inside your pelvis.

These veins around the ovaries and pelvic organs can become stretched and twisted (“tortuous”). Instead of keeping blood moving upward and back to the heart, they allow it to fall backward and pool.

This creates pressure inside the veins, which can lead to that heavy, aching discomfort (pelvic venous insufficiency).

A helpful comparison: in men, a similar condition exists called a varicocele (varicose veins around the testicles). PCS is essentially the pelvic equivalent.

A quick anatomy moment

In PCS, you’ll often hear about affected ovarian veins and iliac veins.

  • Ovarian veins → drain blood from the ovaries

  • Iliac veins → larger veins that drain blood from the pelvis, bladder, uterus, and legs, carrying it back toward the heart

Think of those veins acting like a drainage system. Veins normally have tiny one-way valves that keep blood flowing upward.

When veins widen, and those valves are weaker → blood flows backward (reflux) → pressure builds → aching pain develops.

Why Does It Happen?

Risk factors include:

  • Pregnancy (especially multiple pregnancies), which stretches veins and weakens valves

  • PCS can still occur in people who have never been pregnant

Other contributing factors:

  • Hormones (especially estrogen, which relaxes vein walls)

  • Genetics (weaker connective tissue)

  • Structural differences in veins

  • Existing varicose veins in the legs

What Does It Feel Like?

PCS pain often has a characteristic pattern:

  • Dull, heavy, aching pelvic pain

Worse:

  • After long standing or walking

  • At the end of the day

  • Before periods

Other signs:

  • Visible varicose veins (vulva or upper thighs)

Overlap with Endometriosis:

  • Pain during or after sex

  • Period pain

  • Bladder or rectal pressure

Helpful Clue:

  • PCS pain is often postural (worse when standing due to gravity)

  • Endometriosis pain is often cyclical (linked to periods)

People can absolutely have both.

Diagnosis

  • Venography (gold standard): dye test showing backflow, enlarged veins, congestion (invasive)

Less invasive options:

  • Transvaginal ultrasound with Doppler

  • MRI or CT venography

Who Manages PCS?

Management is usually multidisciplinary:

  • Interventional radiologists

  • Vascular surgeons

  • Gynecologists

Treatment May Include:

  • Vein embolization

  • Hormonal treatments

  • Compression strategies (garments, compression socks)

  • Pain management

PCS & Endometriosis

In one study, about 61.5% of women with chronic pelvic pain and pelvic vein enlargement also showed signs of endometriosis.

This suggests these conditions can coexist and explains why some patients:

  • Don’t improve as expected after endometriosis treatment alone

  • Have symptoms that don’t fully fit one diagnosis

Research is still evolving, but overlap appears significant.

PCS & Connective Tissue (EDS/HSD)

You may also hear about:

  • Hypermobile Ehlers-Danlos syndrome (hEDS)

  • Hypermobility Spectrum Disorders (HSD)

These affect connective tissue throughout the body, including veins.

If connective tissue is more fragile:

  • Vein walls are weaker

  • Valves fail more easily

This can lead to earlier PCS symptoms, even without typical risk factors.

The Bigger Picture: Pevic Venous Disorders

PCS may be part of a broader venous issue involving compression.

Examples:

  • Nutcracker syndrome → kidney vein compression → blood backs up into ovarian vein

  • May-Thurner syndrome → iliac vein compression → blood struggles to leave pelvis

This creates a “traffic jam” effect, leading to pooling and enlarged veins.

These conditions may be more common in people with connective tissue disorders.

The Takeaway

Endometriosis awareness is growing, which is a powerful step forward.

But other causes of chronic pelvic pain—like PCS—are still underrecognized.

For some patients, PCS may be a missing piece of the puzzle, especially when symptoms overlap or don’t fully respond to endometriosis treatment.

References:
  1. Durham JD, Machan L. Pelvic congestion syndrome. Semin Intervent Radiol. 2013;30(4):372–380.
  2. Steenbeek MP, van der Vleuten CJM, Schultze Kool LJ, Nieboer TE. Noninvasive diagnostic tools for pelvic congestion syndrome: a systematic review. Acta Obstet Gynecol Scand. 2018;97(7):776–786.
  3. Sheikh AB, Fudim M, Garg I, Minhas AA, Sobotka PA, Patel MR, et al. The clinical problem of pelvic venous disorders. Interv Cardiol Clin. 2022;11(3):307–324.
  4. Antropova EY, Sharafutdinov BM, Mazitova MI, Gaziev EA, Khisamieva GA, Shtern VV. Venous congestive syndrome—an interdisciplinary problem. RMJ “Mother and Child”. 2021;(4):346–350.
  5. Krambeck C, Tesch K, Watrowski R, Maass N, Alkatout I. Pelvic congestion syndrome: the gynecological perspective. J Clin Med. 2026;15(4):1655.
  6. Amato ACM, Cardoso da Silva AE, Bernal IM, de Oliveira JC, Ribeiro MDP, Schinzari PS, et al. Combined nutcracker and Ehlers-Danlos syndromes: a case report. EJVES Vasc Forum. 2020;47:12–17.
  7. Gilliam E, Hoffman JD, Yeh G. Urogenital and pelvic complications in the Ehlers-Danlos syndromes and associated hypermobility spectrum disorders: a scoping review. Clin Genet. 2019;97(1):168–178.
  8. Clark MR, Taylor AC. Pelvic venous disorders: an update in terminology, diagnosis, and treatment. Semin Intervent Radiol. 2023;40(4):362–371.
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False-Negative Biopsies in Endometriosis