How to Sleep With May-Thurner Syndrome
May-Thurner Syndrome (MTS) is a vascular condition in which the right iliac artery compresses the left iliac vein. It leads to restricted blood flow and an increased risk of deep vein thrombosis (DVT). This compression can cause leg pain, swelling, and heaviness that often worsen when lying down, making it difficult to sleep comfortably.
Many people with MTS experience throbbing discomfort, leg cramps, or swelling in the left leg that worsens after long periods of sitting or standing during the day. To comfortably sleep with May-Thurner Syndrome, you should elevate your legs, stretch before bed, and sleep on your left side.
If you’re living with May-Thurner Syndrome and struggling to sleep comfortably, CACVI is here to help. Our team has over 30 years of experience in providing expert evaluation and personalized treatment options to restore healthy blood flow and reduce your discomfort. Contact us today!
In this post, we’ll cover what May-Thurner Syndrome is and why it can make sleep uncomfortable. We will also share best sleeping positions and bedtime routines for people living with MTS.
What Is May-Thurner Syndrome?
May-Thurner Syndrome (MTS), also known as iliac vein compression syndrome, is a vascular condition that occurs when the right iliac artery compresses the left iliac vein. This compression restricts blood flow from the left leg back to the heart, potentially leading to serious complications such as deep vein thrombosis (DVT).
The condition primarily affects the blood vessels in the pelvis and lower extremities, particularly the left leg, where oxygen-poor blood may begin to pool due to impaired circulation. Over time, this impeded blood flow can cause the vein walls to become irritated or damaged, increasing the risk of blood clot formation and post-thrombotic syndrome.
This anatomical issue can be present from birth but may go unnoticed until symptoms develop. Individuals who experience prolonged periods of immobility, such as from extended sitting or standing, may be more likely to develop May-Thurner Syndrome. Other risk factors include female gender, pregnancy, postpartum changes, use of birth control or hormone therapy, and a history of vein disease or chronic venous insufficiency.
People who are genetically predisposed to blood clotting disorders may also be more vulnerable. The pressure caused by the iliac artery on the iliac vein can impair healthy blood circulation and lead to clot formation, which is especially dangerous if a clot travels to the lungs and causes a pulmonary embolism.
The symptoms of May-Thurner Syndrome often begin subtly and can worsen over time, especially during the night. Individuals may notice leg swelling, discomfort, heaviness, or a throbbing sensation in the affected leg, most often the left. Chronic pelvic pain and pressure may also be present, particularly in women.
Nighttime can exacerbate these symptoms because sleep naturally involves prolonged inactivity, which contributes to blood pooling in the legs. Without regular muscle contractions, such as those from walking or flexing the calf muscles, blood circulation slows significantly, increasing discomfort and the risk of clot formation. People may also experience restless legs or difficulty falling asleep due to persistent leg pain and swelling. These sleep disturbances can have a major impact on overall well-being and daily functioning.
How May-Thurner Syndrome Affects Sleep
When lying down, individuals with May-Thurner Syndrome frequently experience leg pain, heaviness, and discomfort. This discomfort stems from the pressure on the compressed vein, which worsens in certain sleep positions.
Swelling in the affected leg is common and can limit movement, making it difficult to find a comfortable sleep position. In more severe cases, this swelling may contribute to chronic pelvic pain and restless legs, leading to sleep disturbances and negatively affecting overall well-being.
As the night progresses, the risk of serious complications like deep vein thrombosis (DVT) increases due to prolonged inactivity. Without movement, the likelihood of clot formation rises, potentially leading to life-threatening outcomes such as pulmonary embolism.
Best Sleep Positions for May-Thurner Syndrome
The way you sleep can directly impact the severity of symptoms by either improving or impeding blood flow through the iliac veins. Elevating the legs during sleep is one of the most effective ways to reduce pressure in the left iliac vein. By keeping the legs elevated above the heart, blood is encouraged to flow more freely from the lower extremities back to the heart, significantly reducing swelling and relieving symptoms like leg pain and pressure.
To achieve this elevation, pillows or specially designed wedges can be placed under the knees and calves. An adjustable bed is even more effective, as it allows for precise control of elevation to suit your comfort level while also promoting healthy blood circulation. For people dealing with chronic symptoms, this type of setup can make the difference between a night of tossing and turning and a restful sleep that supports vascular health.
Another position that may relieve symptoms of May-Thurner Syndrome is sleeping on the left side. This position has been found to reduce the compression of the left iliac vein by shifting internal pressure away from the iliac artery. As a result, it supports improved blood circulation through the pelvic veins and reduces the chances of blood pooling in the left leg. This position may also help alleviate chronic pelvic pain caused by the condition.
Conversely, sleeping on the right side or lying flat on your back can worsen symptoms. These positions may increase pressure on the iliac veins or reduce the ability of gravity to assist with venous return. The result is restricted blood flow that can trigger swelling, pain, or cramping during the night.
Sleep Accessories for Iliac Vein Compression Syndrome
When choosing pillows for leg elevation, it’s important to select ones that provide firm yet gentle support. Memory foam wedges are ideal, as they help maintain a consistent angle and apply gentle pressure that enhances venous return without compromising comfort. Adjustable beds are even more effective, allowing you to elevate the lower body while also reducing pressure on the hips and lower back. This setup can be particularly beneficial for patients managing post-thrombotic syndrome or chronic venous insufficiency.
While compression stockings are a key part of managing May-Thurner Syndrome during the day, they are not always necessary to wear overnight. Some vascular specialists may recommend removing them before bed unless advised otherwise, as compression during sleep is not typically required when legs are elevated and movement is minimal. However, if swelling is persistent, a vein doctor may recommend mild overnight compression to help maintain blood flow.
Cooling sheets and leg wraps can also help relieve symptoms by reducing inflammation and temperature in the affected leg. This can be especially useful for individuals dealing with swelling, restless legs, or discomfort caused by chronic pelvic pain. Maintaining a cool, comfortable sleep environment supports your body’s natural vascular function and helps promote deep, uninterrupted sleep.
When It’s Time to Seek Medical Help for MTS
It is critical to contact a vascular doctor if you experience severe or persistent leg pain, swelling that doesn’t improve with leg elevation, or symptoms that may suggest deep vein thrombosis (DVT), such as redness, warmth, and tenderness in one leg. A sudden onset of chest pain, rapid heartbeat, or difficulty breathing could indicate a pulmonary embolism, which is a medical emergency. Additionally, if your symptoms worsen over time despite wearing compression stockings or making lifestyle changes, it’s a sign that conservative treatment may no longer be effective, and advanced medical intervention is needed.
One of the most serious risks of leaving May-Thurner Syndrome untreated is DVT, where a blood clot forms in the deep veins of the leg, most often the left leg, due to compression of the left iliac vein. If that clot dislodges, it can travel to the lungs and cause a pulmonary embolism, which can be life-threatening. This makes early diagnosis and intervention vital.
MTS can also progress to chronic venous insufficiency (CVI), a condition where veins lose the ability to return blood efficiently to the heart. Over time, this can result in blood pooling, varicose veins, leg pain, skin changes, and even open sores (venous ulcers). These complications not only cause discomfort but also significantly affect your day-to-day quality of life. If you’re noticing persistent swelling, leg fatigue, or pain that disrupts sleep or daily activities, don’t wait to seek expert care.
Medical Treatments for May-Thurner Syndrome (MTS)
Treating May-Thurner Syndrome typically requires professional care to restore healthy blood circulation and prevent further vein damage. While conservative treatments may help relieve symptoms in the early stages, medical intervention becomes essential as the condition progresses. A vascular surgeon or specialist will assess your symptoms and perform diagnostic tests like Doppler ultrasounds or CT scans to determine the extent of the iliac vein compression.
Non-surgical treatments often include compression therapy, where wearing compression stockings helps manage swelling, encourages healthy blood flow, and reduces the risk of clot formation. Blood thinners or anticoagulants may be prescribed to patients at risk of developing DVT or pulmonary embolism. Additionally, lifestyle modifications such as avoiding prolonged sitting, exercising regularly, and keeping the legs elevated can improve blood flow and reduce swelling. These steps help in preventing blood clots and promoting vein health.
For more advanced cases, invasive procedures may be necessary. Stenting is a common solution where a vascular specialist inserts a small mesh tube into the compressed vein to keep it open, restoring blood flow and relieving pressure. Another minimally invasive option is angioplasty, where a balloon is used to widen the vein, often followed by stent placement for lasting results. Endovenous laser therapy (EVLT), which uses targeted heat to close off diseased veins, may also be considered in select cases..
In rare and severe cases, surgical interventions such as vein bypass surgery may be required to reroute blood flow around the compressed vein. This is especially common in patients who have developed extensive clotting or who are not responding to less invasive treatments. Venous stent placement during surgery may be used to keep the iliac vein open and prevent future compression.
Due to the complexity of May-Thurner Syndrome and its potential for serious complications, consulting with a vascular specialist is essential. A vascular doctor has the expertise to diagnose and treat vein disease, including iliac vein compression, and to create a treatment plan tailored to your individual needs. With the right medical guidance, you can improve blood flow, reduce swelling, relieve symptoms, and restore your sleep quality and overall well-being. Early diagnosis and treatment can significantly reduce the risk of severe complications and improve your vascular health long-term.
Need to Talk to a Doctor About May-Thurner Syndrome?
Living with May-Thurner Syndrome (MTS) requires more than awareness. It requires strategic routines, proper positioning, and the right support tools to maintain your vascular health.
From elevating your legs to avoiding prolonged periods of inactivity, small daily choices can make a big difference in relieving symptoms and preventing complications like deep vein thrombosis or chronic venous insufficiency. Maintaining these habits can improve blood circulation, reduce swelling, and contribute to better sleep quality and overall well-being.
However, no amount of at-home care can replace the importance of expert medical evaluation and treatment. Every case of MTS is different, and symptoms such as leg pain, blood pooling, and chronic pelvic discomfort may point to more serious underlying issues. That’s why it’s essential to consult with a vascular specialist who understands the complexities of iliac vein compression and can tailor a treatment plan that fits your unique needs.
If you’re experiencing signs of MTS or want a second opinion, don’t wait. At our Center for Advanced Cardiac and Vascular Interventions (CACVI) in Los Angeles, we have a team of experienced vein doctors and vascular surgeons who can diagnose, treat, and help you prevent serious complications associated with May-Thurner Syndrome. Contact CACVI today to schedule your consultation.
FAQs
Can I Wear Compression Stockings While Sleeping With MTS?
Compression stockings are typically worn during the day to support healthy blood circulation. Wearing them overnight should only be done if specifically recommended by your vascular specialist.
Is MTS a Permanent Condition or Can It Be Corrected?
May-Thurner Syndrome can often be effectively managed or corrected through treatments like stenting, which relieve vein compression and restore normal blood flow.
Should I Be Concerned About Blood Clots During Sleep?
Yes, prolonged inactivity during sleep can increase the risk of blood clots, especially if you have restricted blood flow in the left iliac vein.
How Long Does It Take To Recover From a May-Thurner Syndrome Stent?
Most people experience significant symptom relief within a few days, but full recovery and return to normal activity typically take a few weeks, depending on individual health and treatment response.
What Type of Mattress Is Best for MTS-Related Discomfort?
A medium-firm mattress with good support and pressure relief is ideal, especially when paired with leg elevation pillows or an adjustable bed to promote venous return and reduce swelling.
✓ Medically reviewed by
Dr. Moinakhtar Lala
M.D., FACC, FSCAI, RPVI · Limb salvage and endovascular intervention
Built the limb salvage and amputation prevention programme at CACVI, which is why patients call him the leg saver. Board certified in general cardiology, endovascular interventions, echocardiography, nuclear cardiology and vascular ultrasound.
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