Can sclerotherapy cause clotting?

If the chemical is injected directly into the vein and stops it up, couldn't the blood clot and cause problems? Is sclerotherapy safe if someone has a blood clotting disorder?

Answers from doctors (10)


San Fernando Valley Vascular Group

Published on Aug 13, 2019

Yes, sclerotherapy can cause clotting, but the incidence is 1 in 1,000.

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Answered by San Fernando Valley Vascular Group

Yes, sclerotherapy can cause clotting, but the incidence is 1 in 1,000.

Published on Jul 11, 2012


Finesse Surgical Solutions

Published on Mar 27, 2013

Sclerotherapy does cause thrombosis and scarring of the small target veins. This promotes abliteration and subsequent elimination of these veins. However the clotting is not dangerous and should not involve any larger or deeper veins.

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Answered by Finesse Surgical Solutions

Sclerotherapy does cause thrombosis and scarring of the small target veins. This promotes abliteration and subsequent elimination of these veins. However the clotting is not dangerous and should not involve any larger or deeper veins.

Published on Jul 11, 2012


Columbia Doctors Interventional Radiology

Published on Jan 25, 2013

Not really. Sclerotherapy is usually reserved for tiny spider veins. Injecting them does not carry a risk of clotting deep veins. If the veins are larger than spider veins, injecting them with some sort of imaging guidance would be best.

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Answered by Columbia Doctors Interventional Radiology

Not really. Sclerotherapy is usually reserved for tiny spider veins. Injecting them does not carry a risk of clotting deep veins. If the veins are larger than spider veins, injecting them with some sort of imaging guidance would be best.

Published on Jul 11, 2012


Vanish Vein and Laser Center

Published on Sep 16, 2010

Sclerotherapy works usually in one of two ways-displacing the blood in the vein to cause it to seal and later dissolve or clotting the blood in the vein first which will lead to resorption of the vein. So sclerotherapy can cause clotting but this is in only superficial veins. It would be unusual for sclerotherapy to cause clots in deeper veins. Sclerotherapy can be done in someone with a blood clotting disorder but it would carry increased risks. I have done sclero in several such patients without any major problems but it has been more difficult to clear all of the spiders. I would recommend you confer with a hematologist before commencing treatment.

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Answered by Vanish Vein and Laser Center

Sclerotherapy works usually in one of two ways-displacing the blood in the vein to cause it to seal and later dissolve or clotting the blood in the vein first which will lead to resorption of the vein. So sclerotherapy can cause clotting but this is in only superficial veins. It would be unusual for sclerotherapy to cause clots in deeper veins. Sclerotherapy can be done in someone with a blood clotting disorder but it would carry increased risks. I have done sclero in several such patients without any major problems but it has been more difficult to clear all of the spiders. I would recommend you confer with a hematologist before commencing treatment.

Published on Jul 11, 2012


More About Doctor Laser Vein Center

Published on Nov 16, 2009

The intention of sclerotherapy is to create inflammation within the lining of the vein, causing it to collapse and seal closed. This process frequently involves trapping and subsequent clotting of small amounts of blood within the involved vessel, which the body slowly reabsorbs over time. This process is perfectly normal, and is not dangerous. The dangerous types of blood clots are called "deep vein clots", these vessels are all superficial, and very small. I have not experienced difficulties with patients who have clotting disorders, again because the treated areas are very superficial, and involve small vessels. However, common sense would dictate that we would simply exercise more caution, and be more conservative with someone who has a known clotting disorder, depending on what type it is.

Answered by Laser Vein Center (View Profile)

The intention of sclerotherapy is to create inflammation within the lining of the vein, causing it to collapse and seal closed. This process frequently involves trapping and subsequent clotting of small amounts of blood within the involved vessel, which the body slowly reabsorbs over time. This process is perfectly normal, and is not dangerous. The dangerous types of blood clots are called "deep vein clots", these vessels are all superficial, and very small. I have not experienced difficulties with patients who have clotting disorders, again because the treated areas are very superficial, and involve small vessels. However, common sense would dictate that we would simply exercise more caution, and be more conservative with someone who has a known clotting disorder, depending on what type it is.

Published on Jul 11, 2012


Miller Vein

Published on Nov 03, 2009

The short answer is sclerotherapy is very safe. Blood clots in the superficial veins (the ones being treated) are usually not problematic unless extensive.

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Answered by Miller Vein

The short answer is sclerotherapy is very safe. Blood clots in the superficial veins (the ones being treated) are usually not problematic unless extensive.

Published on Jul 11, 2012


Vein Specialty Medical Clinic, Inc.

Published on Nov 02, 2009

First we should separate clotting in superficial veins versus clotting in deep veins. Clot formation in sclerotherapy targeted superficial varicose veins and even spider veins is expected and is part of the treatment, not a complication. In fact the name of same type of medication that we use here in US, is ThromboVar (meaning cLot in Varice) in France. VeinClots in superficial veins of legs is not dangerous and cannot lead to pulmonary embolization per se. Normally, clots (trapped blood) in superficial veins that are treated with sclerotherapy are removed by simple procedures about 1-3 weeks after sclerotherapy. Clotting in the deep vein system is referred to DVT (deep Vein thrombosis) and is a risk and complication of any leg surgery or other treatments, which can lead to life threatening pulmonary embolization specially in the case of deep vein clots at thigh and groin levels. With proper sclerotherapy, risk of DVT is very slim and estimated at less than 1/10,000 (when done by experienced phlebologists).

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Answered by Vein Specialty Medical Clinic, Inc.

First we should separate clotting in superficial veins versus clotting in deep veins. Clot formation in sclerotherapy targeted superficial varicose veins and even spider veins is expected and is part of the treatment, not a complication. In fact the name of same type of medication that we use here in US, is ThromboVar (meaning cLot in Varice) in France. VeinClots in superficial veins of legs is not dangerous and cannot lead to pulmonary embolization per se. Normally, clots (trapped blood) in superficial veins that are treated with sclerotherapy are removed by simple procedures about 1-3 weeks after sclerotherapy. Clotting in the deep vein system is referred to DVT (deep Vein thrombosis) and is a risk and complication of any leg surgery or other treatments, which can lead to life threatening pulmonary embolization specially in the case of deep vein clots at thigh and groin levels. With proper sclerotherapy, risk of DVT is very slim and estimated at less than 1/10,000 (when done by experienced phlebologists).

Published on Jul 11, 2012


General Vascular Surgery Group

Published on Nov 02, 2009

By definition sclerotherapy causes clotting of the targeted veins injected. This is the desired effect to close off the dysfunctional veins. Generally these clotted veins cause no problems, but it does aleviate symptoms and unsightly veins. There may be contraindications to injection sclerotherapy in patients with clotting disorders i.e hypercoaguable states.

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Answered by General Vascular Surgery Group

By definition sclerotherapy causes clotting of the targeted veins injected. This is the desired effect to close off the dysfunctional veins. Generally these clotted veins cause no problems, but it does aleviate symptoms and unsightly veins. There may be contraindications to injection sclerotherapy in patients with clotting disorders i.e hypercoaguable states.

Published on Jul 11, 2012


Angelo N. Makris MD

Published on Nov 02, 2009

What you are saying is true and a known complication of sclerotherapy.
However, in experienced hands, it is safe even in patient's with a
clotting disorder.

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Answered by Angelo N. Makris MD

What you are saying is true and a known complication of sclerotherapy.
However, in experienced hands, it is safe even in patient's with a
clotting disorder.

Published on Jul 11, 2012


VeinSolutions - Edina

Published on Nov 02, 2009

Sclerotherapy can cause pockets of trapped blood (which can be drained),
but this is very superficial and doesn't typically cause further
problems. It is very rare for a patient to get a DVT (deep vein clot)
from sclerotherapy. We do have our patients walk around for about 10
minutes directly following a treatment. The reason for this is to get
the blood circulating and flush out any of the solution from the deep
veins if it were to accidentally end up in the deep veins.

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Answered by VeinSolutions - Edina

Sclerotherapy can cause pockets of trapped blood (which can be drained),
but this is very superficial and doesn't typically cause further
problems. It is very rare for a patient to get a DVT (deep vein clot)
from sclerotherapy. We do have our patients walk around for about 10
minutes directly following a treatment. The reason for this is to get
the blood circulating and flush out any of the solution from the deep
veins if it were to accidentally end up in the deep veins.

Published on Jul 11, 2012


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