Pelvic congestion syndrome (PCS) is a condition where veins in the pelvis become enlarged and swollen, similar to varicose veins in the legs, causing chronic pelvic pain that lasts six months or longer. It accounts for roughly 30% of chronic pelvic pain cases in women and primarily affects those of childbearing age. About one quarter of reproductive-age women experience chronic pelvic pain, and PCS is one of the most common causes, yet it often goes undiagnosed for years because its symptoms overlap with other conditions.
What Happens Inside the Pelvis
Veins carry blood back toward the heart. In PCS, the valves inside the ovarian and pelvic veins stop working properly, allowing blood to flow backward and pool. This backward flow, called reflux, stretches the veins over time. A normal ovarian vein measures less than 5 mm in diameter. In PCS, these veins dilate to 6 mm or larger, and blood moves sluggishly through them at less than 3 cm per second. The pooling blood increases pressure in the surrounding pelvic veins, which become tortuous and engorged, essentially creating a network of varicose veins deep inside the pelvis.
The left ovarian vein is more commonly affected because of the way it connects to other veins at a steep angle, making it more vulnerable to reflux. In some cases, the left renal vein gets compressed between two arteries (a situation sometimes called Nutcracker syndrome), which raises pressure and worsens the backup into the ovarian vein.
Who Is Most at Risk
Pregnancy is the strongest risk factor. During pregnancy, the ovarian veins expand significantly to handle increased blood flow to the uterus, and hormone changes soften vein walls. After delivery, these veins don’t always return to their original size or function. The more pregnancies you’ve had, the greater the likelihood of lasting vein damage. PCS is most commonly diagnosed in women between their late 20s and early 40s, with one study reporting a mean age of 38 at diagnosis.
Interestingly, having enlarged ovarian veins doesn’t guarantee symptoms. Up to 47% of women who have given birth show left ovarian reflux and enlarged veins on imaging but experience no pain at all. This disconnect between anatomy and symptoms is one reason PCS can be difficult to diagnose and why imaging alone isn’t enough to confirm it.
How Pelvic Congestion Pain Feels
The hallmark of PCS is a dull, achy, or heavy sensation in the pelvis. Less commonly, the pain can be sharp and intense. What sets it apart from many other causes of pelvic pain is its relationship to position and timing. The pain typically gets worse:
- At the end of the day
- After prolonged standing or sitting
- Before and during your period
- During or after intercourse
Lying down usually brings relief, because gravity stops pulling blood downward into the dilated veins. Many women also notice lower back pain and fatigue. Some develop visible varicose veins on the upper thighs, buttocks, or vulva, which can be an important visual clue for both patients and clinicians.
How PCS Differs From Endometriosis
PCS and endometriosis share several symptoms, including pelvic pain and discomfort during sex, which is why they’re frequently confused. The differences come down to pattern and associated symptoms. Endometriosis pain is tightly linked to the menstrual cycle and often comes with heavy or prolonged periods, irregular bleeding, and fertility problems. PCS pain is more influenced by body position and activity than by your cycle. PCS does not cause abnormal uterine bleeding or affect fertility. The presence of visible varicose veins in the lower body points toward PCS, while worsening bloating, diarrhea, or nausea around your period is more characteristic of endometriosis.
It’s also possible to have both conditions at the same time, which complicates diagnosis. If treatment for one condition doesn’t resolve your symptoms, it’s worth exploring whether the other is also contributing.
How PCS Is Diagnosed
PCS is often a diagnosis of exclusion, meaning other causes of pelvic pain are ruled out first. Transvaginal ultrasound is typically the initial imaging test. It can reveal dilated pelvic veins, slow blood flow, and reversed flow direction in the ovarian veins. Vein structures larger than 5 mm in diameter suggest pelvic varicosities. At a 6 mm cutoff for the ovarian vein, the positive predictive value for PCS reaches about 83%, meaning that size reliably identifies the condition in most cases.
If ultrasound findings are suggestive, the next step is usually pelvic venography, a specialized imaging procedure where contrast dye is injected directly into the pelvic veins. This gives the clearest picture of which veins are affected, how blood is flowing, and whether veins are filling abnormally across the midline or feeding into visible varicose veins in the thighs or vulva. CT or MRI scans can also show enlarged veins and help rule out other pelvic abnormalities.
A newer classification system called SVP (Symptoms, Varices, Pathophysiology) has been developed by vascular specialists to standardize how pelvic venous disorders are described, accounting for symptom severity, the location of varicose veins, and the underlying cause at each anatomical level.
Treatment Options
Treatment generally starts conservatively. Pain management with anti-inflammatory medications and hormonal therapies that suppress ovarian function can reduce the engorgement of pelvic veins and ease symptoms. These approaches work well enough for some women, but when pain persists or significantly affects quality of life, a minimally invasive procedure called ovarian vein embolization is the most common next step.
During embolization, an interventional radiologist threads a thin catheter through a vein (usually in the neck or groin) and guides it to the affected ovarian or pelvic veins using imaging. Small metal coils or other materials are placed inside the faulty veins to block blood flow. Once flow stops, the veins shrink and the pressure that was causing pain drops. In one study, nearly 89% of women experienced more than 80% immediate pain relief after the procedure. At an average follow-up of about 13 months, symptom relief ranged from 40% to 100% depending on the specific symptom.
The recovery is quick. Most patients go home the same day and return to normal activities within a week. The veins that are blocked are not needed once they’re sealed off, because blood reroutes through healthy veins.
What to Expect Long Term
For most women who undergo embolization, pain improves significantly and stays improved. The procedure has a strong track record of durability, though some women need a second procedure if additional veins are contributing to symptoms that weren’t addressed the first time. Women who respond well to hormonal management can continue that approach, though symptoms may return if treatment is stopped.
PCS does not increase your risk of serious complications like blood clots in the deep veins. It’s primarily a quality-of-life condition, but one that can be genuinely debilitating when untreated. The pain, fatigue, and discomfort during sex can affect relationships, work, and mental health for years before a correct diagnosis is made. If you’ve been experiencing positional pelvic pain that worsens through the day and improves when lying down, especially if you’ve had pregnancies or notice varicose veins in your lower body, PCS is worth raising with your provider specifically, since it’s not always on the standard checklist for pelvic pain evaluation.