Living With May-Thurner Syndrome: Life Expectancy, Stents, Blood Thinners, Sleep and Activity

If you have just been told you have May-Thurner syndrome, one of the first things you may search for is may-thurner syndrome life expectancy. The reassuring answer is that the vein compression itself is not known to shorten life. What matters is the risk of blood clots, and that risk can be reduced and watched for. This guide explains the outlook, then covers everyday life with a stent or after a clot: blood thinners, exercise, sleep, travel, pregnancy and hormones, and the warning signs to act on.

May-Thurner syndrome life expectancy: the short answer

In May-Thurner syndrome, the left iliac vein in the pelvis is pressed between the right iliac artery and the spine. Read more in our May-Thurner syndrome overview.

That anatomy is common. In one study of people scanned for other reasons, about 1 in 4 had the left iliac vein narrowed by more than half, and most had no symptoms at all. So having the compression is not, on its own, a disease that shortens life.

There are no good studies of lifespan in May-Thurner syndrome specifically. Based on what is known about the condition, most people can expect a normal life expectancy. The exceptions come from complications, mainly clots, which is why the rest of this page focuses on lowering that risk.

Where the real risks come from

The narrowed vein slows blood leaving the left leg. Over time, that can lead to:

• Deep vein thrombosis (DVT). A clot in the deep veins, often starting high in the pelvis and causing swelling of the whole left leg. Our sister site explains deep vein thrombosis in detail.
• Pulmonary embolism (PE). Part of a clot breaks off and travels to the lungs. This can be life-threatening and needs emergency treatment.
• Post-thrombotic syndrome. Long-term swelling, heaviness, aching and skin changes in a leg that has had a DVT.
• Chronic swelling and varicose veins in the left leg, even without a clot.

Knowing the warning signs, and getting treatment early, is what keeps these risks low. See May-Thurner syndrome symptoms for the early signs.

Post-thrombotic syndrome and life expectancy

Post-thrombotic syndrome (PTS) develops in a proportion of people after a DVT, especially a large clot high in the leg. It mainly affects comfort, mobility and quality of life rather than lifespan. In its most severe form, it can cause leg ulcers that are slow to heal.

Things that may help include regular walking, raising the leg when resting, compression stockings if your doctor advises them, and, in some people with a narrowed iliac vein, treatment with a stent. Speak to your specialist if your leg symptoms are getting worse.

Living with a stent

A stent is a small mesh tube that holds the vein open. It stays in permanently. To look after it:

• Keep your follow-up scans. Ultrasound checks are usually done in the first weeks and then at intervals, often yearly, to spot narrowing early.
• Know the signs of a problem. Swelling, heaviness or aching that returns after improving can mean the stent is narrowing or clotting. Contact your team the same day if swelling comes on suddenly.
• Carry your stent card if you are given one, and mention the stent before any scan, operation or MRI.

For the procedure and the first weeks afterwards, see our guide to iliac vein stenting.

Blood thinners: what to know

Many people take an anticoagulant or an anti-platelet medicine for a time after a stent or a clot. How long depends on the reason. After stenting for compression alone, it is often a few months. After a clot, or if you have a clotting tendency, it may be longer or lifelong.

Practical points:

• Never stop or change a blood thinner without speaking to your specialist, even if you feel well.
• Take it at the same time each day, and ask in advance what to do if you miss a dose.
• Tell every doctor, dentist and pharmacist that you take one, including before procedures.
• Check before taking anything new, including painkillers, herbal remedies and supplements, as some raise bleeding risk or interact.
• Know the signs of bleeding: blood in your urine or stools, black stools, vomiting blood, heavy or unusual bruising, or a severe headache. Seek help promptly.

Exercise and staying active

Activity is good for leg veins. The calf muscles act as a pump that pushes blood back towards the heart. Walking, swimming, cycling and gentle strength work are all reasonable choices for most people. Build up gradually after a procedure, following your team’s timetable.

If you take a blood thinner, ask your doctor about contact sports and activities with a high risk of falls or blows to the head.

How to sleep with May-Thurner syndrome

No sleeping position has been shown to treat May-Thurner syndrome, so the aim is comfort and less swelling:

• Raise the leg if it swells. A pillow or wedge under the calf and foot, so the foot is a little above the hip, helps fluid drain overnight.
• Choose the position that feels best. Back, side or front are all fine for most people.
• In later pregnancy, follow your midwife’s or doctor’s advice, which is usually to sleep on your side.
• If leg pain or swelling keeps you awake, mention it at your next review, as it may mean the vein needs reassessing.

Travel and long journeys

Long flights, car rides and bus journeys mean hours of sitting, which slows blood flow in the legs. Before a long journey, especially soon after a clot or procedure, ask your doctor whether you need any extra precautions. On the way:

• Get up and walk every hour or two when you can
• Flex and circle your ankles while seated
• Drink enough water and limit alcohol
• Wear compression stockings if your doctor has advised them

Our sister site has more on how to prevent DVT.

Pregnancy, contraception and HRT

Pregnancy, oestrogen-containing contraceptive pills, patches and rings, and some types of hormone replacement therapy (HRT) all raise the risk of clots. This does not mean you cannot have them, but it does mean planning ahead:

• Before pregnancy, talk to your specialist and obstetrician. Some blood thinners are not used in pregnancy and may need to be switched. Your team may suggest blood-thinning injections during pregnancy or after the birth, depending on your overall risk.
• For contraception or HRT, tell the prescriber about May-Thurner syndrome and any past clot. Options that do not contain oestrogen may be suggested.

Compression stockings

Compression stockings may ease leg swelling and aching, and are sometimes advised after a DVT or for post-thrombotic symptoms. They need to be the right type and size. Our sister site explains compression stockings for blood clots, including when they help and when they may not. A Singapore vascular surgeon’s May-Thurner syndrome page gives another overview of treatment and follow-up.

When to see a doctor

See a doctor if your left leg is often swollen, heavy or aching, if symptoms return after a stent, or if you are planning pregnancy or starting hormones and have had a clot before. You can use our pelvic symptom check to organise your thoughts before an appointment.

Get urgent medical help if you have:

• Sudden swelling, pain, warmth or redness in one leg, especially the whole leg
• Sudden breathlessness, chest pain that is worse when you breathe in, coughing up blood, a racing heart, or fainting
• Heavy bleeding that will not stop, vomiting blood, black stools or a sudden severe headache while taking a blood thinner

These can be signs of a clot or of serious bleeding. 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.