Does pelvic congestion syndrome cause weight gain? The honest answer is that there is no good evidence that it does. Pelvic congestion syndrome (PCS) is pain caused by widened pelvic veins, and no study has shown that these veins make you put on weight. But many women with PCS do describe bloating, a swollen lower tummy, tiredness and dizzy spells, and these can feel like weight gain. This guide explains what is known, what is not, and which other causes are worth checking.
Does pelvic congestion syndrome cause weight gain?
Widened pelvic veins hold more blood than normal, but the extra volume is small and does not show up as weight on the scales. We found no research showing that pelvic congestion syndrome causes weight gain.
There are some indirect ways it could play a part:
- Less activity. Pain that builds with standing and walking can make it harder to exercise.
- Poor sleep and low mood. Both are common with long-term pain and can affect appetite and energy.
- Medicines. Some hormonal treatments used for PCS, particularly certain progestogens, can cause weight gain as a side effect. If you think a medicine is affecting your weight, talk to your doctor rather than stopping it yourself.
If you are gaining weight without a clear reason, do not assume it is your veins. See the section on other causes below.
Does pelvic congestion syndrome cause bloating?
Bloating is one of the symptoms women with PCS mention most often. They describe a full, tight or swollen lower tummy that is worse by the end of the day, after standing, or before a period, and better after lying down. That pattern matches the way pelvic vein pain behaves.
The evidence, though, is thin. In an online survey of members of a PCS support group, most respondents reported symptoms of irritable bowel syndrome (IBS), which commonly includes bloating. A small study of 45 women treated for pelvic vein problems found bloating in about four in five, and scores improved after treatment. These studies relied on people reporting their own symptoms, had no comparison groups and came from specialist practices, so they cannot prove that the veins cause the bloating.
What we can say is that bloating and PCS often appear together, and that IBS, constipation and hormonal changes in the menstrual cycle are common causes of bloating in their own right.
Can pelvic congestion syndrome cause dizzy spells?
Some women with PCS describe feeling light-headed, dizzy or faint, especially when they stand for a long time. In the support group survey, dizziness was reported by about six in ten respondents who had not yet been treated.
One theory is venous pooling. When you stand, gravity pulls blood down into the veins of the pelvis and legs. If those veins are wide and their valves leak, more blood may collect there, so less returns to the heart. The heart may then speed up to compensate, and you may feel dizzy.
This is the same kind of problem seen in postural tachycardia syndrome (POTS), a condition in which the heart rate rises abnormally on standing. Some researchers have found that pelvic vein problems are common in people with POTS. The evidence is still emerging; read more in our guide to pelvic veins and POTS.
Dizziness has many other causes, including dehydration, low blood pressure, anaemia, inner ear problems, some medicines and heart rhythm problems. It should be assessed rather than put down to your veins.
Does pelvic congestion syndrome cause fatigue?
Tiredness is very common in women with PCS. Severe fatigue was the most frequent extra symptom in the support group survey, and specialist patient information also lists a lack of energy. Likely reasons include:
- Long-term pain, which is tiring in itself
- Poor sleep, especially if pain wakes you
- Low mood or anxiety, which often go with chronic pain
- Heavy periods, which can lead to iron deficiency anaemia
Our guide to PCS symptoms covers the wider range of symptoms women describe.
What about headaches and nausea?
Migraines and headaches were also commonly reported in the survey, but there is no clear evidence that pelvic veins cause them. Nausea is not a typical symptom of PCS itself. It can happen for a few days after embolisation as part of the body’s reaction to the treated veins; see recovery after pelvic vein embolisation.
Can treating pelvic veins help these symptoms?
Some small studies report that bloating, tiredness and dizziness improved after pelvic vein treatment. But these studies had no comparison groups, so part of the improvement may be due to other factors, such as less pain, better sleep or the natural ups and downs of symptoms. Embolisation is a treatment for pelvic pain from proven vein reflux. It should not be offered for weight gain, bloating or fatigue alone. See pelvic congestion syndrome treatment for the main options.
Other causes to check
Weight gain, bloating, tiredness and dizziness are common, and most have nothing to do with veins. A doctor may want to rule out:
- An underactive thyroid. This can cause weight gain, tiredness, constipation and feeling cold. A simple blood test checks it.
- Iron deficiency anaemia, often from heavy periods. It causes tiredness, breathlessness and dizziness.
- Bowel problems such as IBS, constipation, coeliac disease or food intolerance, which commonly cause bloating.
- Hormonal changes, including the menstrual cycle, perimenopause and PMOS (formerly PCOS), which can affect weight and bloating.
- Medicines, including some hormonal treatments, antidepressants and steroids.
- Ovarian causes, including ovarian cysts and, rarely, ovarian cancer.
Hormones and periods can affect how veins feel too; a Singapore vascular surgeon’s article on veins and the menstrual cycle explains this link.
Persistent bloating: when to think about ovarian cancer
Ovarian cancer is uncommon, but its early symptoms can be vague and overlap with PCS. The NHS advises seeing a doctor if you often have:
- Bloating or a swollen tummy
- Tummy or pelvic pain
- Loss of appetite or feeling full quickly
- A need to pass urine urgently or more often
These symptoms usually have other causes, but they should be checked, especially if they are new, frequent or getting worse. Do not assume they are caused by known pelvic veins. Read more about pelvic congestion and ovarian cancer.
When to see a doctor
See a doctor if you have unexplained weight gain or weight loss, bloating that keeps coming back, tiredness that does not improve with rest, or dizzy spells. Mention all your symptoms, not just the pelvic pain, as they help your doctor see the whole picture. Our pelvic symptom check can help you prepare.
Get urgent medical help if you faint, have chest pain or a racing heart with breathlessness, a swollen tummy with sudden severe pain, vomiting blood, or cannot pass urine, stool or wind. In Singapore, call 995 in an emergency.
Frequently asked questions
Can pelvic congestion syndrome cause weight gain?
Not directly, as far as we know. No study has shown that widened pelvic veins make you put on weight. Indirect reasons are possible: pain can make it harder to stay active, and some hormonal medicines used for pelvic congestion list weight gain as a side effect. Unexplained weight gain should be checked for other causes.
Does pelvic congestion syndrome cause bloating?
Many women with pelvic congestion describe bloating or a swollen, full lower tummy, often worse by the end of the day or before a period. It is not clear whether the veins cause it or whether it comes from a common bowel problem such as irritable bowel syndrome. Bloating that is persistent or new should be checked.
Can pelvic congestion syndrome cause dizzy spells?
Some women with pelvic vein problems report dizziness, especially when standing. One theory is that blood pools in the widened veins of the pelvis and legs, so less returns to the heart. This overlaps with POTS. The evidence is still emerging, and dizziness has many other causes.
Does pelvic congestion syndrome cause fatigue?
Tiredness is common in women with pelvic congestion. Long-term pain, poor sleep and low mood all drain energy. Heavy periods can also cause iron deficiency, which leads to tiredness. A doctor can check for treatable causes such as anaemia or an underactive thyroid.
Can pelvic congestion syndrome cause headaches or nausea?
Headaches and nausea have been reported by some women with pelvic congestion in surveys, but there is no clear evidence that the veins cause them. Nausea can also happen for a few days after embolisation. New or severe headaches, or headaches with other worrying symptoms, need prompt assessment.
Sources and further reading
- Smith SJ, Sichlau MJ. An online survey of pelvic congestion support group members regarding comorbid symptoms and syndromes. Phlebology 2022
- CIRSE — Pelvic congestion syndrome (patient information)
- NHS — Bloating
- NHS — Symptoms of ovarian cancer
- NHS — Underactive thyroid (hypothyroidism)
- Smith SJ et al. Nonpelvic comorbid symptoms of 45 patients with pain of pelvic venous origin, before and after treatment. Phlebology 2024
This article is general information, not personal medical advice. Please speak to a doctor about your own symptoms. How we create our content.
