Pelvic Congestion Syndrome and POTS: Is There a Link?

People searching for pelvic congestion syndrome and POTS are often living with both: a heavy pelvic ache, and dizziness or a racing heart when they stand. Some doctors now think the two may be connected through the way blood pools in the veins. This is a new area of research, and the honest answer is that the link is possible but not proven. This guide explains what POTS is, why a link has been suggested, how POTS is diagnosed and managed, and who to see.

What is POTS?

Postural orthostatic tachycardia syndrome (POTS), also written PoTS, is a condition in which the heart rate rises more than it should when you stand up. In adults, it is usually defined as a rise of at least 30 beats per minute within 10 minutes of standing (40 in teenagers), without a big drop in blood pressure, together with symptoms on standing that have lasted for several months.

Common symptoms include:

• Dizziness or light-headedness when standing
• Palpitations, a pounding or racing heart
• Fainting or nearly fainting
• Extreme tiredness and “brain fog”
• Shakiness, sweating and breathlessness
• Headaches, nausea and other stomach problems
• Purple or discoloured legs or hands when standing

POTS mostly affects young women. It is more common in people with joint hypermobility, after viral illnesses including COVID-19, and in people with chronic fatigue syndrome. Symptoms are often worse in heat, after big meals, during periods and after standing still for a long time.

Why might pelvic veins be involved?

When you stand, gravity pulls a large volume of blood down into the veins of the belly, pelvis and legs. Normally, the leg muscles and reflexes in the blood vessels push it back up to the heart.

The venous pooling theory suggests that if the veins of the pelvis are wide and leaky, as in pelvic congestion syndrome, or blocked higher up, as in May-Thurner or nutcracker syndrome, more blood may collect there on standing. Less blood then returns to the heart, and the heart speeds up to keep blood pressure steady. In theory, this could cause or worsen POTS symptoms.

The wider group of these vein problems is called pelvic venous disorders.

What does the research show?

The evidence is limited and early. Here is what has been reported:

• Iliac vein compression on scans. A US study looked back at CT scans of 191 women with POTS and 25 women without. Significant squeezing of the left iliac vein was found in about 69% of the women with POTS, compared with 40% of the comparison group. Compression is common in people without symptoms too, so this does not show that it causes POTS.
• Pelvic vein findings in POTS clinics. A 2026 report from two US centres found pelvic vein compression or congestion in most people with POTS who also had pelvic vein symptoms. Many of those treated with iliac vein stenting reported better quality of life over a year.
• A systematic review. A 2026 review gathered 16 studies on pelvic vein problems and symptoms on standing. Most were case reports, small case series or single-group studies, and the authors judged the overall risk of bias as moderate to high. They concluded the link is biologically plausible but that proper trials are needed.
• Surveys of women with PCS. In an online survey of a pelvic congestion support group, dizziness and severe fatigue were common, and about one in eleven respondents reported a POTS diagnosis.

Put simply, these studies show an association in selected groups of patients, mostly at clinics with a special interest in the topic. None is a randomised trial, follow-up is short, and they cannot prove that pelvic veins cause POTS or that treating them is better than standard POTS care.

May-Thurner syndrome and POTS

In May-Thurner syndrome, the left iliac vein is pressed against the spine by an artery that crosses it. This can slow blood leaving the left leg and pelvis. Case reports and small series describe people with POTS, often with Ehlers-Danlos syndrome, whose symptoms improved after the narrowed vein was treated with a stent.

Iliac vein stenting is a significant procedure. Stents can block or narrow, some people need blood-thinning medicine afterwards, and long-term follow-up in young people is limited. It is not a standard treatment for POTS. If it is suggested, ask what evidence supports it in your case and get a second opinion if unsure. A Singapore vascular surgeon’s page on iliac vein compression explains how this condition is assessed.

Nutcracker syndrome, where the left kidney vein is squeezed, has also been linked to symptoms on standing in some reports, particularly in children and teenagers.

Ehlers-Danlos syndrome, POTS and pelvic congestion

Hypermobile Ehlers-Danlos syndrome (EDS) and hypermobility spectrum disorder affect the body’s connective tissue. POTS is more common in people with these conditions. Reviews suggest that vein compression syndromes and pelvic congestion may be more common too, perhaps because stretchy tissue lets veins widen more easily. In the support group survey above, a noticeable minority of women reported EDS or loose joints. The numbers are small, and more research is needed.

How POTS is diagnosed

POTS is diagnosed from your symptoms and your heart rate and blood pressure, not from pelvic scans. Tests may include:

• Active stand test. Heart rate and blood pressure are measured lying down, then repeatedly after standing for up to 10 minutes.
• Tilt table test. You lie on a table that tilts you upright while your heart rate and blood pressure are monitored.
• ECG and blood tests to look for other causes, such as anaemia, thyroid problems or heart rhythm disorders.
• Other heart tests, such as a heart scan or 24-hour monitoring, if needed.

If you also have pelvic pain, vulval or leg varicose veins, or leg swelling, your doctor may arrange a pelvic venous ultrasound. Standard scans can miss vein compression, so results need careful interpretation by someone experienced.

Managing POTS: the basics

First-line POTS management does not involve vein procedures. It usually includes:

• Drinking more fluids through the day
• Salt, but only if your doctor advises it, as extra salt is not right for everyone
• Compression garments, such as waist-high support tights or abdominal binders, which may also ease pelvic vein aching
• Graded exercise, often starting lying down or seated (rowing, swimming, recumbent cycling) and building up slowly
• Avoiding triggers such as heat, large carbohydrate-rich meals, alcohol and standing still for long periods
• Physical counter-measures when you feel faint: lie down and raise your legs, or cross your legs and clench your buttock and tummy muscles

Some people are prescribed medicines by a specialist to help control heart rate or blood volume. These need individual medical advice.

Who should I see?

POTS is usually diagnosed and managed by a cardiologist, often one with an interest in fainting and autonomic problems, or by a specialist autonomic or general medicine team. Pelvic vein problems are assessed by a vascular surgeon or interventional radiologist; see which specialist treats pelvic congestion.

If you have both sets of symptoms, it helps to have doctors who will talk to each other. Your POTS should be properly diagnosed first, and vein treatment considered only if there is clear evidence of a significant vein problem that also explains your pelvic symptoms.

When to see a doctor

See a doctor if you often feel dizzy, light-headed or have a racing heart when you stand, especially with pelvic pain, tiredness or leg swelling. Our guide to dizziness, bloating and fatigue with pelvic congestion covers other symptoms, and our pelvic symptom check can help you prepare.

Get urgent medical help if you faint and injure yourself, faint during exercise or while lying down, have chest pain, a racing heart with breathlessness, or a painful swollen leg. In Singapore, call 995 in an emergency.

This article is general information, not personal medical advice. Please speak to a doctor about your own symptoms. How we create our content.