DVT Treatment Window: When Blood Thinners May Not Be Enough

Blood thinners are the main treatment for most deep vein thromboses (DVTs). In selected patients with an extensive clot affecting the large veins near the groin or pelvis, early assessment may also identify a role for clot removal or treatment of an underlying narrowing. The decision depends on symptoms, clot anatomy, timing and the risks of treatment.

In this video, Dr Andrew Choong, vascular and endovascular surgeon in Singapore, explains why a new DVT and persistent problems after an old DVT need different assessments.

Sudden breathlessness, chest pain, coughing blood or fainting may indicate a pulmonary embolism. Seek emergency care immediately; call 995 in Singapore for life-threatening symptoms. Do not wait for a routine appointment or an online reply.

What do blood thinners do for a DVT?

A deep vein thrombosis is a clot in a deep vein, commonly in the leg. Anticoagulants, often called blood thinners, reduce further clotting and help prevent the clot from growing or travelling to the lungs. They remain essential treatment for many patients.

They do not directly remove the clot or repair a scarred vein. The body gradually deals with the clot, and recovery varies. Some patients recover well with medication and follow-up; others have significant obstruction or persistent symptoms that warrant further assessment. Continue prescribed treatment and discuss any changes with your treating clinician.

When might early clot removal be considered?

The location matters. An iliofemoral DVT involves the iliac veins in the pelvis and/or the common femoral vein near the groin. Extensive clot in these veins can interfere substantially with blood draining from the leg, particularly when swelling and pain are severe.

Assessment considers:

• Where the clot is and how much of the vein is affected.

• When symptoms began and whether they are improving or worsening.

• The effect on walking, daily activity and the condition of the leg.

• Bleeding risk, recent surgery, other illnesses and the patient's preferences.

Selected patients with recent, symptomatic iliofemoral DVT may benefit from a discussion about early clot removal. For clot limited to veins farther down the thigh, behind the knee or in the calf, clot removal is generally not recommended. Severe, rapidly worsening swelling or pain with a marked change in leg colour needs emergency assessment.

What does the treatment window mean?

A fresh clot and longstanding scar tissue are different problems. Some clot-directed treatments are most relevant early, before the clot becomes more organised. This is why a newly diagnosed DVT with a very swollen, painful leg deserves prompt review of both the initial treatment and the clot's extent.

There is no single deadline that tells every patient whether a procedure will help. The technique, symptom duration, scan findings and overall health all matter. Seeking advice promptly preserves the opportunity to consider suitable options; it does not mean every patient needs an intervention.

What treatments may be discussed?

As Dr Choong explains, options in carefully selected cases include catheter-directed treatment, thrombectomy, venoplasty and venous stenting. Catheter-directed thrombolysis delivers clot-dissolving medicine into the clot. Thrombectomy uses a device to remove clot. If an important underlying vein narrowing is identified, a balloon or stent may sometimes be considered to improve drainage.

These approaches have different risks and evidence. Thrombolysis can cause major bleeding, and other procedures also have complications. Removing clot does not guarantee that post-thrombotic syndrome will be prevented, and anticoagulation usually remains part of care after an intervention. The DVT treatment guide explains how medication, selected procedures and follow-up fit together.

Why can symptoms persist months or years later?

A previous DVT can leave residual obstruction, vein scarring or damaged valves that allow backward flow, called reflux. The leg may remain swollen, heavy or painful. Skin around the ankle can darken, and some people develop venous ulcers. These problems may form part of post-thrombotic syndrome (PTS).

PTS can develop despite appropriate treatment. Persistent symptoms do not automatically mean that the original clot was treated incorrectly, that a new clot is present, or that a procedure is required. New or suddenly worsening symptoms need prompt assessment rather than being assumed to be the old problem.

A review asks whether there is residual blockage, pelvic vein narrowing, reflux or another explanation. Duplex ultrasound helps assess the veins; further imaging is selected when needed. Comparing previous scans can help distinguish longstanding changes from a new concern.

Preparing for a vascular review

Bring the date symptoms started, previous scan reports and images, hospital discharge information, and an up-to-date medication list. Describe how symptoms affect standing, walking, work and skin care. The aim is to understand the problem and discuss realistic options, including care without a procedure.

For ongoing symptoms after DVT or a discussion of an existing treatment plan, contact Andrew Choong Vascular Surgery at Mount Elizabeth Novena Specialist Centre, Singapore. A new suspected DVT needs urgent medical assessment. You can also watch Dr Choong's short explanation of the DVT treatment window.

DVT Warning: Red, hot, swollen painful leg

A new swollen, painful or unusually warm leg, especially on one side, needs urgent medical assessment. It may be a deep vein thrombosis, or DVT: a blood clot in a vein deep inside the leg. Not everyone has every symptom, and you should not wait for a complete checklist before seeking help.

In this video, I explain why this combination matters, which situations can increase the risk of a clot and how an ultrasound scan helps investigate it. The message is straightforward: do not dismiss a sudden change as ordinary tiredness or your usual leg swelling.

What symptoms can a DVT cause?

Possible symptoms include:

• Swelling: commonly affecting one leg more than the other.

• Pain or tenderness: often in the calf or thigh, without an obvious explanation.

• Warmth: an affected area that feels hotter than usual.

• A change in skin colour: including redness or darker colouring, which may be less obvious on some skin tones.

Other conditions, such as infection, injury or inflammation, can produce similar symptoms. Some people with DVT have few or no obvious signs. This is why appearance alone cannot confirm or exclude a clot. Our DVT information page explains the condition in more detail.

Why can a clot in the leg affect the lungs?

A DVT can interfere with blood drainage from the leg. If part of the clot breaks away, it can travel through the circulation and lodge in the blood vessels of the lungs. This is called a pulmonary embolism (PE), which can be life-threatening.

Sudden breathlessness, chest pain, coughing blood, fainting or collapse require emergency assessment. These symptoms can occur even without obvious leg symptoms. In Singapore, call 995 for a life-threatening emergency. Do not wait for a clinic appointment or an online reply.

Who has a higher risk of DVT?

In the video, I highlight cancer, some blood conditions, long-haul travel, periods of immobility and major orthopaedic surgery. These situations may increase the tendency for blood to clot or reduce its movement through the leg veins.

Previous DVT, pregnancy and the period after childbirth, and some hormone treatments are also relevant. Several risks can occur together. However, DVT can happen without an obvious trigger, so the absence of a recent flight or operation is not a reason to ignore symptoms.

Long journeys by car, bus or train can also involve prolonged sitting. The concern is not unique to flying; limited movement and a person’s underlying risk both matter.

How is a suspected DVT assessed?

A clinician will ask about the symptoms, examine the leg and review your risk factors. A venous duplex ultrasound is a common first-line imaging test. It examines the deep veins and helps identify a clot and its location.

Depending on the clinical assessment, blood tests or further imaging may also be needed. If symptoms persist or change after an initial assessment, follow the advice given about reassessment. A scan result needs to be interpreted alongside the full clinical picture.

What happens if a DVT is confirmed?

Treatment commonly involves anticoagulant medicines, often called blood thinners. They help stop the clot extending and reduce the risk of further clots while the body deals with the existing clot. The medicine and duration depend on factors such as the clot’s location, cause and bleeding risk.

Some patients need additional specialist treatment. Follow-up also considers ongoing swelling or discomfort and whether there are underlying factors to address. A new suspected clot needs urgent care, rather than treatment based only on information in a video.

What can you do before a long journey?

Move your legs regularly and take opportunities to walk when safe. Keeping normally hydrated is sensible, but drinking water alone should not be regarded as protection against a travel-related clot.

If you have had a clot, recent surgery, cancer or another significant risk factor, discuss travel precautions with your clinician beforehand. Compression stockings or preventive medicines are appropriate for selected people and should be individually advised.

Related DVT Guides

Read more about DVT treatment in Singapore, pulmonary embolism and vascular duplex ultrasound. These guides support the urgent-care advice above; do not delay assessment for new symptoms.

DVT assessment in Singapore

Seek urgent medical care for new one-sided painful swelling. For non-emergency questions about previous DVT or ongoing venous care, contact Andrew Choong Vascular Surgery at Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563.

This article provides general education and does not replace an individual medical assessment.

When Is Leg Swelling Not Just Water Retention? 2 of 2

Leg swelling that builds towards evening may be related to venous reflux, but new swelling in one leg needs prompt attention. A red, hot, painful calf can occur with deep vein thrombosis, and a clot does not always cause every one of those signs. The safest next step depends on the pattern and timing of symptoms.

This is the second part of the series. Part one explains the different causes of leg swelling.

What can the timing of swelling tell us?

With venous reflux, leaking valves make it harder for blood to return efficiently from the legs. Gravity and long periods with little movement can increase pressure in the veins. Some people notice more swelling after standing, sitting or travelling, and less after resting with their legs elevated.

That pattern can support a discussion about venous disease, but it cannot confirm the cause. In particular, swelling after a long flight should not automatically be dismissed as familiar reflux. A new one-sided change deserves assessment even if you have had varicose veins for years.

Does improvement with compression prove that the veins are responsible?

No. Feeling better in compression stockings can be useful information for your clinician, but it is not a diagnostic test. It does not rule out a blood clot or another explanation for swelling.

Tell your doctor what you have tried and how symptoms responded. If compression is being considered, the appropriate type and fit should be assessed, including whether arterial circulation or other health conditions make it unsuitable. New symptoms should be evaluated rather than managed simply by choosing tighter stockings.

When should one-sided leg swelling be checked?

New unexplained swelling affecting one leg should be checked promptly, especially if accompanied by calf pain, warmth, redness or a change in skin colour. These findings can occur with deep vein thrombosis, often called DVT, but can also have other causes.

A DVT is a clot in a deep vein. The classic description of a red, hot, swollen calf is a useful warning, not a checklist that must be complete. The absence of dramatic redness or severe pain does not safely exclude a clot. A clinician needs to assess the symptoms and relevant risk factors.

Which symptoms mean I should call for emergency help?

Call 995 in Singapore for sudden breathlessness, chest pain, coughing up blood or collapse, particularly when there is also leg pain or swelling. These can be signs of a pulmonary embolism, where a clot has travelled to the lungs, or another serious emergency.

Do not wait for a routine vein appointment if these symptoms occur. The priority is urgent hospital assessment. Leg swelling alone and leg swelling with breathing symptoms require different levels of urgency.

How does a duplex ultrasound help?

A duplex ultrasound provides information about the veins and the blood moving through them. For suspected venous reflux, the examination can assess valve function and identify the veins involved. This helps link the symptoms to an anatomical problem and supports treatment planning.

When a clot is suspected, the assessment follows an urgent diagnostic pathway. The clinician considers the history and examination and may arrange ultrasound and blood tests as appropriate. A scan requested for chronic reflux should not be assumed to replace a timely assessment for new DVT symptoms.

What should I tell the clinician?

Explain exactly when the swelling began, whether one or both legs are affected and how it differs from your usual pattern. Mention recent surgery, a hospital stay, reduced mobility, travel, cancer treatment or a previous clot. Include medicines, including hormone treatments, in your medication list.

If the swelling has been recurring over weeks or months, describe whether it improves overnight and whether there are visible veins or skin changes. This helps distinguish the questions that need to be answered rather than treating all swelling as the same condition.

What happens after the cause is identified?

Care depends on the diagnosis. Confirmed venous reflux, DVT and non-vascular causes of swelling need different approaches. An ultrasound result may lead to advice, further investigation or a discussion of suitable treatment; it does not mean everyone needs a vein procedure. Read more about varicose veins and venous conditions.

Our guide to varicose veins, DVT and leg swelling brings together the related conditions and assessment pathways.

Where can I arrange a non-emergency assessment?

For persistent or recurring symptoms, contact Dr Andrew Choong’s clinic at Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563. Bring previous imaging and your medication list. For new one-sided swelling, seek prompt medical assessment; for chest or breathing symptoms, use emergency services.

This article provides general education and does not replace an individual medical assessment.

When Is Leg Swelling Not Just Water Retention? 1 of 2

Leg swelling is often described as “water retention”, but that phrase does not explain why it is happening. Fluid can accumulate in the legs for several different reasons, including problems affecting the whole body, an injury or difficulty returning blood through the veins. Identifying the cause is the first step towards an appropriate plan.

What does “water retention” actually mean?

Swelling caused by fluid collecting in the tissues is called oedema. It describes a physical finding rather than a complete diagnosis. Two people with similarly swollen ankles may have quite different underlying problems and need different investigations.

The useful next questions are when the swelling began, whether one or both legs are affected, and what else has changed. A label alone cannot answer those questions or establish whether the situation is routine or urgent.

Can a problem elsewhere in the body cause swollen legs?

Yes. Some causes are systemic, meaning they affect the body more broadly. Heart problems can increase pressure in the circulation and contribute to swelling. Kidney or liver conditions and disturbances in fluid or protein balance can also be relevant.

Certain medicines may contribute to ankle swelling as well. This is one reason a medication list is useful at an appointment. Do not stop prescribed medicines on your own: a clinician needs to consider the timing of symptoms, the reason for treatment and possible alternatives.

Swelling in both legs may prompt questions about general health, but it does not automatically mean a heart or kidney disorder. The distribution is one clue among several, rather than a diagnosis by itself.

What local problems can make a leg swell?

A local cause affects a particular area. An injury, inflammation around a joint or an infection can produce swelling. The history may include a twist, fall, painful joint, wound or a change in the skin, but sometimes the explanation is less obvious.

One leg becoming larger than the other deserves attention, especially when the change is new. A clinician will consider vascular and non-vascular possibilities. An assessment should not start with the assumption that all swelling is due to veins.

How does venous reflux contribute to swelling?

Leg veins return blood towards the heart. Their valves help keep flow moving in the intended direction. When valves do not work effectively, blood can flow backwards, a problem called venous reflux. The resulting pressure can contribute to fluid accumulating in the tissues.

This explains why a vein problem can create more than visible varicose veins. Heaviness, aching and swelling may be part of the same circulation issue. Read more about varicose veins and venous disease.

However, finding visible veins does not prove they explain every symptom. Vein disease can coexist with a joint problem, medication-related swelling or another medical condition. The assessment needs to consider the whole picture.

What information helps identify the cause?

Before a non-emergency appointment, note whether the swelling appeared suddenly or gradually, whether it changes over the day, and whether both legs are affected equally. Describe any pain, skin changes, breathlessness or recent illness.

Also mention recent travel, surgery, reduced mobility and any previous blood clot. Bring medication details and previous test results. These observations help the clinician decide whether a venous ultrasound, other investigations or a different specialist assessment is needed. They should not delay urgent care when warning signs are present.

When should swelling be checked urgently?

Seek prompt medical assessment for new unexplained swelling in one leg, especially if it is painful, red or warm. A deep vein thrombosis is one possible cause, although other conditions can look similar. Sudden breathlessness, chest pain or collapse requires emergency help: call 995 in Singapore.

Persistent or worsening swelling in both legs also warrants medical review. Treating the appearance of swelling without understanding its cause can miss a problem that needs a different approach.

Our guide to varicose veins, DVT and leg swelling brings together the related conditions and assessment pathways.

Where can I discuss persistent leg swelling in Singapore?

For a non-emergency vascular assessment, contact Dr Andrew Choong’s clinic at Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563. The aim is to understand whether venous disease contributes to the swelling and what further assessment or care is appropriate.

This article provides general education and does not replace an individual medical assessment.

Why Varicose Veins Feel Worse at the End of the Day

Varicose veins can feel more uncomfortable after a long day because blood returning from the legs has to work against gravity. If vein valves leak and the calf muscles have been relatively inactive, pressure can build in the leg veins. Aching, heaviness and ankle swelling may therefore become more noticeable towards evening.

Why does gravity affect the veins in the legs?

Veins return blood towards the heart. In the legs, this means moving blood upwards for much of the day. One-way valves help limit backward flow, and the calf muscles act as a pump when you walk and move your ankles.

The return system works differently from the arteries, which carry blood away from the heart under higher pressure. Veins depend on the interaction between valves, muscles and body position. Long periods spent standing still or sitting with the feet down give the calf pump fewer opportunities to help.

What is venous reflux?

Venous reflux means blood flows backwards through valves that are not closing properly. Blood can collect in the veins and raise the pressure below those valves. Enlarged, twisted veins near the skin may become visible as varicose veins.

The visible veins are only part of the picture. The symptoms someone experiences depend on the underlying flow problem and other factors affecting the leg. You can learn more about varicose veins and venous circulation on our condition page.

Which symptoms may become worse by evening?

Venous symptoms can include heaviness, aching, tiredness, cramping and ankle swelling. Some people notice that their shoes feel tighter later in the day. Others describe a dragging discomfort after standing at work or sitting through a long journey.

A pattern that improves after walking or resting with the legs elevated can be useful information, but it does not prove that varicose veins are the cause. Muscle, joint, nerve and other medical conditions can produce overlapping symptoms. Persistent swelling deserves assessment rather than an assumption based on appearance alone.

Can movement and leg elevation help?

Regular walking and gentle ankle movement encourage the calf muscles to assist venous return. Breaking up long periods of stillness may help reduce the build-up of discomfort. Resting with the legs elevated can also ease symptoms for some people.

These measures may improve comfort, but they do not establish the diagnosis or necessarily correct leaking valves. If symptoms are increasing or affecting daily activities, an assessment can clarify whether a treatable vein problem is present.

Compression stockings may be considered in selected circumstances, but they need an appropriate fit and clinical advice. They are not suitable for everyone, particularly when arterial circulation is impaired, and should not replace an assessment of new or unexplained swelling.

What does a venous duplex ultrasound show?

A duplex ultrasound combines images of the veins with information about blood flow. In someone with suspected varicose vein disease, it can identify reflux and help map the veins involved. That makes it useful for confirming the problem and planning treatment.

The scan follows a clinical assessment. Your history, skin changes, swelling and any previous clot or vein treatment all help determine what needs to be examined. A scan result is interpreted alongside those findings rather than in isolation.

Does everyone with varicose veins need a procedure?

No. The decision depends on symptoms, complications, ultrasound findings and personal preferences. Options may include advice, monitoring or a procedure to treat an affected vein. When intervention is appropriate, the clinician can explain the benefits, limitations and recovery associated with the suitable options.

Changes around the ankle such as persistent itching, discolouration, fragile skin or a wound that is not healing are reasons to seek assessment. Varicose veins are not always just a cosmetic concern.

When should I seek urgent help?

Do not attribute sudden one-sided swelling, pain, redness or warmth to ordinary evening vein discomfort. Seek prompt medical assessment because deep vein thrombosis is one possible cause. If swelling is accompanied by chest pain, sudden breathlessness or collapse, call 995 in Singapore. Bleeding from a varicose vein also requires urgent attention.

Where can I arrange a vein assessment in Singapore?

Contact Dr Andrew Choong’s clinic at Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563. Bring previous ultrasound reports and note when the discomfort occurs, whether one or both legs are affected, and what helps. These details support a focused assessment and an individual care plan.

This article provides general education and does not replace an individual medical assessment.

Varicose Veins Are Not Just Cosmetic

Varicose veins are not always just a cosmetic concern. Bulging veins can be a sign that the one-way valves in the leg veins are not working effectively. For some people, this is associated with aching, heaviness or swelling; others notice changes to the skin around the ankle.

In this video, I explain how the leg veins return blood to the heart, what happens when their valves fail and why an ultrasound assessment can be useful. The starting point is understanding your symptoms: not all varicose veins need treatment.

How do the veins in your legs work?

Arteries carry blood away from the heart, while veins return it. In the legs, returning blood has to move upwards against gravity. When you walk, your calf muscles squeeze the veins and help push blood towards the heart. A series of one-way valves helps prevent it from flowing backwards.

This differs from the arterial problem described in my previous video about leg pain when walking and claudication. Both affect circulation, but the underlying problem and the assessment are different.

What is venous reflux?

Venous reflux means that blood flows backwards through veins whose valves are not closing properly. This can increase pressure in the veins, particularly when you are standing. Superficial veins may become enlarged and twisted, producing the visible bulges we call varicose veins.

The appearance alone does not tell us how much reflux is present or whether treatment would help. I consider the symptoms, skin changes and ultrasound findings together when assessing varicose veins and venous disease.

Which symptoms deserve a closer look?

Symptoms and changes associated with venous disease can include:

• Heaviness or aching: legs that feel uncomfortable, especially after prolonged standing.

• Swelling: often noticeable around the ankle or lower leg.

• Bulging veins: enlarged veins visible beneath the skin.

• Skin changes: brownish discolouration, itching or eczema around the lower leg.

• Ulceration: a break in the skin that may be slow to heal in more advanced disease.

These findings are reasons to seek an assessment, rather than assume the problem is only cosmetic. They can also have other causes, so symptoms or photographs alone cannot confirm venous reflux.

What does a duplex ultrasound show?

A venous duplex ultrasound is a non-invasive scan that uses sound waves to examine the veins and the direction of blood flow. It can identify reflux and help map which veins are affected. This information supports the diagnosis and, where appropriate, treatment planning.

During the consultation, I would also ask when your symptoms started, what makes them worse and whether you have had previous vein treatment or blood clots. The examination and scan findings help determine the next step.

Do all varicose veins require treatment?

No. Mild or symptom-free varicose veins may need advice and observation. If symptoms affect daily life, or there are skin changes or ulcers, treatment options can be discussed in more detail.

Depending on the findings, management may include suitable activity, leg elevation, appropriately prescribed compression or a procedure to treat refluxing veins. Compression can help selected symptoms, but it does not repair faulty valves and should be chosen with your circulation and other health conditions in mind. Treatment is individual; a visible vein does not automatically mean an operation is necessary.

When is leg swelling more urgent?

Longstanding venous symptoms are different from new swelling in one leg, particularly with pain, warmth or tenderness. This needs urgent medical assessment for possible deep vein thrombosis (DVT). Do not assume a sudden change is simply your usual varicose veins.

Sudden breathlessness, chest pain or fainting requires emergency care. In Singapore, call 995 for a life-threatening emergency rather than waiting for a clinic appointment.

Varicose vein assessment in Singapore

If aching, swelling or skin changes sound familiar, contact Andrew Choong Vascular Surgery to discuss an assessment at Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563.

This article provides general education and does not replace an individual medical assessment.

President Trump’s Chronic Venous Insufficiency: A Vascular Surgeon Explains

In a public memorandum dated 17 July 2025, the White House physician reported that President Donald Trump had been assessed for mild swelling in his lower legs. The statement said venous Doppler ultrasound showed chronic venous insufficiency, with no evidence of deep vein thrombosis or arterial disease.

That announcement brought a common circulation problem into the news. In my video, I explain the medical terms and what they can mean for patients. I am Dr Andrew Choong, a vascular surgeon in Singapore. The useful lesson is how leg veins work, why they sometimes struggle and how an assessment helps identify the cause of swelling.

What is chronic venous insufficiency?

Chronic venous insufficiency means the veins are not returning blood from the legs as effectively as they should. Normally, the calf muscles help push blood upwards, while valves in the veins help prevent it from flowing backwards.

When valves do not work properly, backward flow - called reflux - can allow blood to pool and raise pressure in the leg veins. Previous vein damage or obstruction may also contribute. The result can be swelling, heaviness, aching or changes in the skin.

Arteries and veins do different jobs. Arteries deliver blood to the legs; veins return it towards the heart. Venous insufficiency should therefore not be confused with a narrowing or blockage of the leg arteries.

Is chronic venous insufficiency always harmless?

It covers a range of severity. Some people have relatively mild symptoms. Others develop persistent swelling, skin irritation, pigmentation or a venous ulcer, often around the ankle.

That range is why the word “common” should not be taken to mean that every patient can ignore symptoms. The appropriate response depends on how the veins are functioning, the effect on daily life and whether skin damage is developing.

Varicose veins and venous disease are related, but visible veins do not tell the whole story. A leg can look different from another person’s leg and still require an individual assessment.

What does a venous duplex ultrasound show?

A duplex scan combines images of the veins with an assessment of blood flow. It can help identify backward flow through faulty valves and look for obstruction or clot, according to the clinical question being investigated.

In practice, the scan needs to be interpreted alongside symptoms and examination. Understanding where a problem begins helps determine whether advice, compression or a vein procedure is appropriate. Treatment should address the underlying findings, rather than rely only on what is visible at the skin’s surface.

Does leg swelling mean there is a blood clot?

No. Swelling has several possible causes, including venous insufficiency, but deep vein thrombosis is an important possibility when a leg becomes newly swollen or painful. A clinician assesses the pattern, timing and personal risk factors before choosing tests.

Blood tests such as D-dimer are not stand-alone answers for everyone. Their usefulness depends on the likelihood of a clot before testing and the rest of the assessment. A reported normal result should not be used to dismiss new symptoms in a different person.

New unexplained one-sided swelling needs prompt assessment. Sudden breathlessness, chest pain, fainting or collapse may signal a pulmonary embolism or another emergency; call 995 in Singapore for severe emergency symptoms.

How can chronic venous insufficiency be managed?

Management is tailored to the cause and severity. Movement, measures to reduce prolonged immobility, and appropriately selected compression may help some patients. Compression needs clinical consideration when there may also be arterial disease.

For suitable patients with superficial venous reflux, a procedure to treat the affected vein may be discussed. Options depend on the scan findings, symptoms and overall health. Skin changes or an ulcer also require a plan for local care and follow-up.

For a non-emergency discussion about swelling, varicose veins or venous symptoms, contact Andrew Choong Vascular Surgery. Current clinic location: Mount Elizabeth Novena Specialist Centre, #09-22, 38 Irrawaddy Road, Singapore 329563.